Ubuntu 18.04 not detecting full RAM size
up vote
10
down vote
favorite
I have Ubuntu 18.04 dual booted with Windows 10. Windows 10 shows full 8 GB RAM.
But in Ubuntu it shows only 6.8 GB.
Is there any way to make it near 8 GB or is this natural?
~$ free
total used free shared buff/cache available
Mem: 7097484 1775180 3633172 67964 1689132 4994508
Swap: 1000444 0 1000444
After turning the swap area off,
~$ free
total used free shared buff/cache available
Mem: 7097484 1776700 4761256 111464 559528 4949096
Swap: 0 0 0
Output
~# dmesg | grep -i memory:
[ 0.000000] PM: Registered nosave memory: [mem 0x00000000-0x00000fff]
[ 0.000000] PM: Registered nosave memory: [mem 0x00087000-0x00087fff]
[ 0.000000] PM: Registered nosave memory: [mem 0x000a0000-0x000bffff]
[ 0.000000] PM: Registered nosave memory: [mem 0x000c0000-0x000fffff]
[ 0.000000] PM: Registered nosave memory: [mem 0x09b00000-0x09dfffff]
[ 0.000000] PM: Registered nosave memory: [mem 0x09f00000-0x09f09fff]
[ 0.000000] PM: Registered nosave memory: [mem 0x6427a000-0x64b79fff]
[ 0.000000] PM: Registered nosave memory: [mem 0x6b58f000-0x6b78efff]
[ 0.000000] PM: Registered nosave memory: [mem 0x6b78f000-0x6d78efff]
[ 0.000000] PM: Registered nosave memory: [mem 0x6d78f000-0x6f78efff]
[ 0.000000] PM: Registered nosave memory: [mem 0x6f78f000-0x6f7fefff]
[ 0.000000] PM: Registered nosave memory: [mem 0x6f800000-0xafffffff]
[ 0.000000] PM: Registered nosave memory: [mem 0xb0000000-0xf7ffffff]
[ 0.000000] PM: Registered nosave memory: [mem 0xf8000000-0xfbffffff]
[ 0.000000] PM: Registered nosave memory: [mem 0xfc000000-0xfebfffff]
[ 0.000000] PM: Registered nosave memory: [mem 0xfec00000-0xfec00fff]
[ 0.000000] PM: Registered nosave memory: [mem 0xfec01000-0xfec0ffff]
[ 0.000000] PM: Registered nosave memory: [mem 0xfec10000-0xfec10fff]
[ 0.000000] PM: Registered nosave memory: [mem 0xfec11000-0xfed7ffff]
[ 0.000000] PM: Registered nosave memory: [mem 0xfed80000-0xfed80fff]
[ 0.000000] PM: Registered nosave memory: [mem 0xfed81000-0xfedfffff]
[ 0.000000] PM: Registered nosave memory: [mem 0xfee00000-0xfee00fff]
[ 0.000000] PM: Registered nosave memory: [mem 0xfee01000-0xff7fffff]
[ 0.000000] PM: Registered nosave memory: [mem 0xff800000-0xfff4ffff]
[ 0.000000] PM: Registered nosave memory: [mem 0xfff50000-0xffffffff]
[ 0.000000] Memory: 6929972K/7238032K available (12300K kernel code, 2472K rwdata, 4248K rodata, 2408K init, 2416K bss, 308060K reserved, 0K cma-reserved)
[ 0.039763] Freeing SMP alternatives memory: 36K
[ 1.147121] Freeing initrd memory: 54212K
[ 141.519341] Freeing unused kernel memory: 2408K
[ 153.310684] Freeing unused kernel memory: 2008K
[ 153.317976] Freeing unused kernel memory: 1896K
[ 153.869546] [TTM] Zone kernel: Available graphics memory: 3548742 kiB
[ 153.869547] [TTM] Zone dma32: Available graphics memory: 2097152 kiB
18.04 ram
edited Nov 13 at 18:04
wjandrea
7,80642258
asked Nov 13 at 15:32
Abraham Francis
648
|
show 6 more comments
up vote
10
down vote
favorite
I have Ubuntu 18.04 dual booted with Windows 10. Windows 10 shows full 8 GB RAM.
But in Ubuntu it shows only 6.8 GB.
Is there any way to make it near 8 GB or is this natural?
~$ free
total used free shared buff/cache available
Mem: 7097484 1775180 3633172 67964 1689132 4994508
Swap: 1000444 0 1000444
After turning the swap area off,
~$ free
total used free shared buff/cache available
Mem: 7097484 1776700 4761256 111464 559528 4949096
Swap: 0 0 0
Output
~# dmesg | grep -i memory:
[ 0.000000] PM: Registered nosave memory: [mem 0x00000000-0x00000fff]
[ 0.000000] PM: Registered nosave memory: [mem 0x00087000-0x00087fff]
[ 0.000000] PM: Registered nosave memory: [mem 0x000a0000-0x000bffff]
[ 0.000000] PM: Registered nosave memory: [mem 0x000c0000-0x000fffff]
[ 0.000000] PM: Registered nosave memory: [mem 0x09b00000-0x09dfffff]
[ 0.000000] PM: Registered nosave memory: [mem 0x09f00000-0x09f09fff]
[ 0.000000] PM: Registered nosave memory: [mem 0x6427a000-0x64b79fff]
[ 0.000000] PM: Registered nosave memory: [mem 0x6b58f000-0x6b78efff]
[ 0.000000] PM: Registered nosave memory: [mem 0x6b78f000-0x6d78efff]
[ 0.000000] PM: Registered nosave memory: [mem 0x6d78f000-0x6f78efff]
[ 0.000000] PM: Registered nosave memory: [mem 0x6f78f000-0x6f7fefff]
[ 0.000000] PM: Registered nosave memory: [mem 0x6f800000-0xafffffff]
[ 0.000000] PM: Registered nosave memory: [mem 0xb0000000-0xf7ffffff]
[ 0.000000] PM: Registered nosave memory: [mem 0xf8000000-0xfbffffff]
[ 0.000000] PM: Registered nosave memory: [mem 0xfc000000-0xfebfffff]
[ 0.000000] PM: Registered nosave memory: [mem 0xfec00000-0xfec00fff]
[ 0.000000] PM: Registered nosave memory: [mem 0xfec01000-0xfec0ffff]
[ 0.000000] PM: Registered nosave memory: [mem 0xfec10000-0xfec10fff]
[ 0.000000] PM: Registered nosave memory: [mem 0xfec11000-0xfed7ffff]
[ 0.000000] PM: Registered nosave memory: [mem 0xfed80000-0xfed80fff]
[ 0.000000] PM: Registered nosave memory: [mem 0xfed81000-0xfedfffff]
[ 0.000000] PM: Registered nosave memory: [mem 0xfee00000-0xfee00fff]
[ 0.000000] PM: Registered nosave memory: [mem 0xfee01000-0xff7fffff]
[ 0.000000] PM: Registered nosave memory: [mem 0xff800000-0xfff4ffff]
[ 0.000000] PM: Registered nosave memory: [mem 0xfff50000-0xffffffff]
[ 0.000000] Memory: 6929972K/7238032K available (12300K kernel code, 2472K rwdata, 4248K rodata, 2408K init, 2416K bss, 308060K reserved, 0K cma-reserved)
[ 0.039763] Freeing SMP alternatives memory: 36K
[ 1.147121] Freeing initrd memory: 54212K
[ 141.519341] Freeing unused kernel memory: 2408K
[ 153.310684] Freeing unused kernel memory: 2008K
[ 153.317976] Freeing unused kernel memory: 1896K
[ 153.869546] [TTM] Zone kernel: Available graphics memory: 3548742 kiB
[ 153.869547] [TTM] Zone dma32: Available graphics memory: 2097152 kiB
18.04 ram
edited Nov 13 at 18:04
wjandrea
7,80642258
asked Nov 13 at 15:32
Abraham Francis
648
15
Some of the RAM is probably reserved for graphics.
– mikewhatever
Nov 13 at 15:40
see here
– Doug Smythies
Nov 13 at 15:46
But I have Radeon 560X (4GB VRAM), by default it is showing AMD Raven(the integrated graphics), can I change it to use Radeon? @mikewhatever
– Abraham Francis
Nov 13 at 15:48
1
But here there is a difference of more than 1 GB right? @Doug Smythies
– Abraham Francis
Nov 13 at 15:53
Well, edit your question and add the relevant stuff from/var/log/kern.log. The answer I pointed you to was just so that you would know what to look for. See also here.
– Doug Smythies
Nov 13 at 15:57
|
show 6 more comments
up vote
10
down vote
favorite
up vote
10
down vote
favorite
I have Ubuntu 18.04 dual booted with Windows 10. Windows 10 shows full 8 GB RAM.
But in Ubuntu it shows only 6.8 GB.
Is there any way to make it near 8 GB or is this natural?
~$ free
total used free shared buff/cache available
Mem: 7097484 1775180 3633172 67964 1689132 4994508
Swap: 1000444 0 1000444
After turning the swap area off,
~$ free
total used free shared buff/cache available
Mem: 7097484 1776700 4761256 111464 559528 4949096
Swap: 0 0 0
Output
~# dmesg | grep -i memory:
[ 0.000000] PM: Registered nosave memory: [mem 0x00000000-0x00000fff]
[ 0.000000] PM: Registered nosave memory: [mem 0x00087000-0x00087fff]
[ 0.000000] PM: Registered nosave memory: [mem 0x000a0000-0x000bffff]
[ 0.000000] PM: Registered nosave memory: [mem 0x000c0000-0x000fffff]
[ 0.000000] PM: Registered nosave memory: [mem 0x09b00000-0x09dfffff]
[ 0.000000] PM: Registered nosave memory: [mem 0x09f00000-0x09f09fff]
[ 0.000000] PM: Registered nosave memory: [mem 0x6427a000-0x64b79fff]
[ 0.000000] PM: Registered nosave memory: [mem 0x6b58f000-0x6b78efff]
[ 0.000000] PM: Registered nosave memory: [mem 0x6b78f000-0x6d78efff]
[ 0.000000] PM: Registered nosave memory: [mem 0x6d78f000-0x6f78efff]
[ 0.000000] PM: Registered nosave memory: [mem 0x6f78f000-0x6f7fefff]
[ 0.000000] PM: Registered nosave memory: [mem 0x6f800000-0xafffffff]
[ 0.000000] PM: Registered nosave memory: [mem 0xb0000000-0xf7ffffff]
[ 0.000000] PM: Registered nosave memory: [mem 0xf8000000-0xfbffffff]
[ 0.000000] PM: Registered nosave memory: [mem 0xfc000000-0xfebfffff]
[ 0.000000] PM: Registered nosave memory: [mem 0xfec00000-0xfec00fff]
[ 0.000000] PM: Registered nosave memory: [mem 0xfec01000-0xfec0ffff]
[ 0.000000] PM: Registered nosave memory: [mem 0xfec10000-0xfec10fff]
[ 0.000000] PM: Registered nosave memory: [mem 0xfec11000-0xfed7ffff]
[ 0.000000] PM: Registered nosave memory: [mem 0xfed80000-0xfed80fff]
[ 0.000000] PM: Registered nosave memory: [mem 0xfed81000-0xfedfffff]
[ 0.000000] PM: Registered nosave memory: [mem 0xfee00000-0xfee00fff]
[ 0.000000] PM: Registered nosave memory: [mem 0xfee01000-0xff7fffff]
[ 0.000000] PM: Registered nosave memory: [mem 0xff800000-0xfff4ffff]
[ 0.000000] PM: Registered nosave memory: [mem 0xfff50000-0xffffffff]
[ 0.000000] Memory: 6929972K/7238032K available (12300K kernel code, 2472K rwdata, 4248K rodata, 2408K init, 2416K bss, 308060K reserved, 0K cma-reserved)
[ 0.039763] Freeing SMP alternatives memory: 36K
[ 1.147121] Freeing initrd memory: 54212K
[ 141.519341] Freeing unused kernel memory: 2408K
[ 153.310684] Freeing unused kernel memory: 2008K
[ 153.317976] Freeing unused kernel memory: 1896K
[ 153.869546] [TTM] Zone kernel: Available graphics memory: 3548742 kiB
[ 153.869547] [TTM] Zone dma32: Available graphics memory: 2097152 kiB
18.04 ram
edited Nov 13 at 18:04
wjandrea
7,80642258
asked Nov 13 at 15:32
Abraham Francis
648
I have Ubuntu 18.04 dual booted with Windows 10. Windows 10 shows full 8 GB RAM.
But in Ubuntu it shows only 6.8 GB.
Is there any way to make it near 8 GB or is this natural?
~$ free
total used free shared buff/cache available
Mem: 7097484 1775180 3633172 67964 1689132 4994508
Swap: 1000444 0 1000444
After turning the swap area off,
~$ free
total used free shared buff/cache available
Mem: 7097484 1776700 4761256 111464 559528 4949096
Swap: 0 0 0
Output
~# dmesg | grep -i memory:
[ 0.000000] PM: Registered nosave memory: [mem 0x00000000-0x00000fff]
[ 0.000000] PM: Registered nosave memory: [mem 0x00087000-0x00087fff]
[ 0.000000] PM: Registered nosave memory: [mem 0x000a0000-0x000bffff]
[ 0.000000] PM: Registered nosave memory: [mem 0x000c0000-0x000fffff]
[ 0.000000] PM: Registered nosave memory: [mem 0x09b00000-0x09dfffff]
[ 0.000000] PM: Registered nosave memory: [mem 0x09f00000-0x09f09fff]
[ 0.000000] PM: Registered nosave memory: [mem 0x6427a000-0x64b79fff]
[ 0.000000] PM: Registered nosave memory: [mem 0x6b58f000-0x6b78efff]
[ 0.000000] PM: Registered nosave memory: [mem 0x6b78f000-0x6d78efff]
[ 0.000000] PM: Registered nosave memory: [mem 0x6d78f000-0x6f78efff]
[ 0.000000] PM: Registered nosave memory: [mem 0x6f78f000-0x6f7fefff]
[ 0.000000] PM: Registered nosave memory: [mem 0x6f800000-0xafffffff]
[ 0.000000] PM: Registered nosave memory: [mem 0xb0000000-0xf7ffffff]
[ 0.000000] PM: Registered nosave memory: [mem 0xf8000000-0xfbffffff]
[ 0.000000] PM: Registered nosave memory: [mem 0xfc000000-0xfebfffff]
[ 0.000000] PM: Registered nosave memory: [mem 0xfec00000-0xfec00fff]
[ 0.000000] PM: Registered nosave memory: [mem 0xfec01000-0xfec0ffff]
[ 0.000000] PM: Registered nosave memory: [mem 0xfec10000-0xfec10fff]
[ 0.000000] PM: Registered nosave memory: [mem 0xfec11000-0xfed7ffff]
[ 0.000000] PM: Registered nosave memory: [mem 0xfed80000-0xfed80fff]
[ 0.000000] PM: Registered nosave memory: [mem 0xfed81000-0xfedfffff]
[ 0.000000] PM: Registered nosave memory: [mem 0xfee00000-0xfee00fff]
[ 0.000000] PM: Registered nosave memory: [mem 0xfee01000-0xff7fffff]
[ 0.000000] PM: Registered nosave memory: [mem 0xff800000-0xfff4ffff]
[ 0.000000] PM: Registered nosave memory: [mem 0xfff50000-0xffffffff]
[ 0.000000] Memory: 6929972K/7238032K available (12300K kernel code, 2472K rwdata, 4248K rodata, 2408K init, 2416K bss, 308060K reserved, 0K cma-reserved)
[ 0.039763] Freeing SMP alternatives memory: 36K
[ 1.147121] Freeing initrd memory: 54212K
[ 141.519341] Freeing unused kernel memory: 2408K
[ 153.310684] Freeing unused kernel memory: 2008K
[ 153.317976] Freeing unused kernel memory: 1896K
[ 153.869546] [TTM] Zone kernel: Available graphics memory: 3548742 kiB
[ 153.869547] [TTM] Zone dma32: Available graphics memory: 2097152 kiB
18.04 ram
18.04 ram
edited Nov 13 at 18:04
wjandrea
7,80642258
asked Nov 13 at 15:32
Abraham Francis
648
edited Nov 13 at 18:04
wjandrea
7,80642258
asked Nov 13 at 15:32
Abraham Francis
648
edited Nov 13 at 18:04
wjandrea
7,80642258
edited Nov 13 at 18:04
wjandrea
7,80642258
edited Nov 13 at 18:04
wjandrea
7,80642258
7,80642258
asked Nov 13 at 15:32
Abraham Francis
648
asked Nov 13 at 15:32
Abraham Francis
648
asked Nov 13 at 15:32
Abraham Francis
648
648
15
Some of the RAM is probably reserved for graphics.
– mikewhatever
Nov 13 at 15:40
see here
– Doug Smythies
Nov 13 at 15:46
But I have Radeon 560X (4GB VRAM), by default it is showing AMD Raven(the integrated graphics), can I change it to use Radeon? @mikewhatever
– Abraham Francis
Nov 13 at 15:48
1
But here there is a difference of more than 1 GB right? @Doug Smythies
– Abraham Francis
Nov 13 at 15:53
Well, edit your question and add the relevant stuff from/var/log/kern.log. The answer I pointed you to was just so that you would know what to look for. See also here.
– Doug Smythies
Nov 13 at 15:57
|
show 6 more comments
15
Some of the RAM is probably reserved for graphics.
– mikewhatever
Nov 13 at 15:40
see here
– Doug Smythies
Nov 13 at 15:46
But I have Radeon 560X (4GB VRAM), by default it is showing AMD Raven(the integrated graphics), can I change it to use Radeon? @mikewhatever
– Abraham Francis
Nov 13 at 15:48
1
But here there is a difference of more than 1 GB right? @Doug Smythies
– Abraham Francis
Nov 13 at 15:53
Well, edit your question and add the relevant stuff from/var/log/kern.log. The answer I pointed you to was just so that you would know what to look for. See also here.
– Doug Smythies
Nov 13 at 15:57
15
15
Some of the RAM is probably reserved for graphics.
– mikewhatever
Nov 13 at 15:40
Some of the RAM is probably reserved for graphics.
– mikewhatever
Nov 13 at 15:40
see here
– Doug Smythies
Nov 13 at 15:46
see here
– Doug Smythies
Nov 13 at 15:46
But I have Radeon 560X (4GB VRAM), by default it is showing AMD Raven(the integrated graphics), can I change it to use Radeon? @mikewhatever
– Abraham Francis
Nov 13 at 15:48
But I have Radeon 560X (4GB VRAM), by default it is showing AMD Raven(the integrated graphics), can I change it to use Radeon? @mikewhatever
– Abraham Francis
Nov 13 at 15:48
1
1
But here there is a difference of more than 1 GB right? @Doug Smythies
– Abraham Francis
Nov 13 at 15:53
But here there is a difference of more than 1 GB right? @Doug Smythies
– Abraham Francis
Nov 13 at 15:53
Well, edit your question and add the relevant stuff from
/var/log/kern.log. The answer I pointed you to was just so that you would know what to look for. See also here.– Doug Smythies
Nov 13 at 15:57
Well, edit your question and add the relevant stuff from
/var/log/kern.log. The answer I pointed you to was just so that you would know what to look for. See also here.– Doug Smythies
Nov 13 at 15:57
|
show 6 more comments
3 Answers
3
active
oldest
votes
up vote
22
down vote
This line:
[ 0.000000] Memory: 6929972K/7238032K available (12300K kernel code, 2472K rwdata, 4248K rodata, 2408K init, 2416K bss, 308060K reserved, 0K cma-reserved)
indicates that BIOS is giving the kernel 7238032K of memory. The rest of the memory is being used by the BIOS:
8,388,608 K Total - 7,238,032 K Kernel = 1,150,576 K reserved by BIOS.
That is an unusually large amount for BIOS to reserve. You would have to look at your BIOS settings to perhaps try to figure out why.
answered Nov 13 at 17:11
Doug Smythies
6,98631428
6
It is possible that the BIOS is reserving a large amount of memory for an on-board GPU (despite it not being used, in favour of the add-on one with its own RAM supply). That would be the first set of settings I'd look at if a BIOS was holding back such a large chunk of physical RAM from the OS.
– David Spillett
Nov 14 at 11:35
add a comment |
up vote
7
down vote
From: Why my acer nitro 5 (AN515-42, Radeon RX 560X) 8gb ram but its just 6.9gb ram usable?
This can only be "fixed" in the bios! But not all bios allow you to
change the pre-allocated memory of the video card, because there is a
risk of the notebook turning a brick! Can you take a picture of this
setting?
answered Nov 13 at 19:08
WinEunuuchs2Unix
39.3k1065147
add a comment |
up vote
0
down vote
Ubuntu is using your CPU's integrated graphics, which consumes ~1.1GB of system memory, whereas Windows is using the discrete graphics, which consumes no system memory.
I'm not sure why Ubuntu defaults to the iGPU, but you can possibly get it to use the dGPU by ensuring that your AMD GPU driver is up to date. If that does not work, you can try using the hybrid graphics feature to switch between GPUs, but do note that this feature is very experimental and very low-level and could easily prevent your Ubuntu install from booting if your hardware setup isn't correctly supported.
answered Nov 14 at 10:09
Ian Kemp
1012
Can you help me here : askubuntu.com/questions/1091846/… ?
– Abraham Francis
Nov 14 at 13:55
1
@cat uh, no. pcmag.com/encyclopedia/term/58834/discrete-graphics
– Ian Kemp
Nov 14 at 19:12
add a comment |
3 Answers
3
active
oldest
votes
3 Answers
3
active
oldest
votes
active
oldest
votes
active
oldest
votes
up vote
22
down vote
This line:
[ 0.000000] Memory: 6929972K/7238032K available (12300K kernel code, 2472K rwdata, 4248K rodata, 2408K init, 2416K bss, 308060K reserved, 0K cma-reserved)
indicates that BIOS is giving the kernel 7238032K of memory. The rest of the memory is being used by the BIOS:
8,388,608 K Total - 7,238,032 K Kernel = 1,150,576 K reserved by BIOS.
That is an unusually large amount for BIOS to reserve. You would have to look at your BIOS settings to perhaps try to figure out why.
answered Nov 13 at 17:11
Doug Smythies
6,98631428
6
It is possible that the BIOS is reserving a large amount of memory for an on-board GPU (despite it not being used, in favour of the add-on one with its own RAM supply). That would be the first set of settings I'd look at if a BIOS was holding back such a large chunk of physical RAM from the OS.
– David Spillett
Nov 14 at 11:35
add a comment |
up vote
22
down vote
This line:
[ 0.000000] Memory: 6929972K/7238032K available (12300K kernel code, 2472K rwdata, 4248K rodata, 2408K init, 2416K bss, 308060K reserved, 0K cma-reserved)
indicates that BIOS is giving the kernel 7238032K of memory. The rest of the memory is being used by the BIOS:
8,388,608 K Total - 7,238,032 K Kernel = 1,150,576 K reserved by BIOS.
That is an unusually large amount for BIOS to reserve. You would have to look at your BIOS settings to perhaps try to figure out why.
answered Nov 13 at 17:11
Doug Smythies
6,98631428
6
It is possible that the BIOS is reserving a large amount of memory for an on-board GPU (despite it not being used, in favour of the add-on one with its own RAM supply). That would be the first set of settings I'd look at if a BIOS was holding back such a large chunk of physical RAM from the OS.
– David Spillett
Nov 14 at 11:35
add a comment |
up vote
22
down vote
up vote
22
down vote
This line:
[ 0.000000] Memory: 6929972K/7238032K available (12300K kernel code, 2472K rwdata, 4248K rodata, 2408K init, 2416K bss, 308060K reserved, 0K cma-reserved)
indicates that BIOS is giving the kernel 7238032K of memory. The rest of the memory is being used by the BIOS:
8,388,608 K Total - 7,238,032 K Kernel = 1,150,576 K reserved by BIOS.
That is an unusually large amount for BIOS to reserve. You would have to look at your BIOS settings to perhaps try to figure out why.
answered Nov 13 at 17:11
Doug Smythies
6,98631428
This line:
[ 0.000000] Memory: 6929972K/7238032K available (12300K kernel code, 2472K rwdata, 4248K rodata, 2408K init, 2416K bss, 308060K reserved, 0K cma-reserved)
indicates that BIOS is giving the kernel 7238032K of memory. The rest of the memory is being used by the BIOS:
8,388,608 K Total - 7,238,032 K Kernel = 1,150,576 K reserved by BIOS.
That is an unusually large amount for BIOS to reserve. You would have to look at your BIOS settings to perhaps try to figure out why.
answered Nov 13 at 17:11
Doug Smythies
6,98631428
edited Nov 13 at 17:29
answered Nov 13 at 17:11
Doug Smythies
6,98631428
answered Nov 13 at 17:11
Doug Smythies
6,98631428
answered Nov 13 at 17:11
Doug Smythies
6,98631428
6,98631428
6
It is possible that the BIOS is reserving a large amount of memory for an on-board GPU (despite it not being used, in favour of the add-on one with its own RAM supply). That would be the first set of settings I'd look at if a BIOS was holding back such a large chunk of physical RAM from the OS.
– David Spillett
Nov 14 at 11:35
add a comment |
6
It is possible that the BIOS is reserving a large amount of memory for an on-board GPU (despite it not being used, in favour of the add-on one with its own RAM supply). That would be the first set of settings I'd look at if a BIOS was holding back such a large chunk of physical RAM from the OS.
– David Spillett
Nov 14 at 11:35
6
6
It is possible that the BIOS is reserving a large amount of memory for an on-board GPU (despite it not being used, in favour of the add-on one with its own RAM supply). That would be the first set of settings I'd look at if a BIOS was holding back such a large chunk of physical RAM from the OS.
– David Spillett
Nov 14 at 11:35
It is possible that the BIOS is reserving a large amount of memory for an on-board GPU (despite it not being used, in favour of the add-on one with its own RAM supply). That would be the first set of settings I'd look at if a BIOS was holding back such a large chunk of physical RAM from the OS.
– David Spillett
Nov 14 at 11:35
add a comment |
up vote
7
down vote
From: Why my acer nitro 5 (AN515-42, Radeon RX 560X) 8gb ram but its just 6.9gb ram usable?
This can only be "fixed" in the bios! But not all bios allow you to
change the pre-allocated memory of the video card, because there is a
risk of the notebook turning a brick! Can you take a picture of this
setting?
answered Nov 13 at 19:08
WinEunuuchs2Unix
39.3k1065147
add a comment |
up vote
7
down vote
From: Why my acer nitro 5 (AN515-42, Radeon RX 560X) 8gb ram but its just 6.9gb ram usable?
This can only be "fixed" in the bios! But not all bios allow you to
change the pre-allocated memory of the video card, because there is a
risk of the notebook turning a brick! Can you take a picture of this
setting?
answered Nov 13 at 19:08
WinEunuuchs2Unix
39.3k1065147
add a comment |
up vote
7
down vote
up vote
7
down vote
From: Why my acer nitro 5 (AN515-42, Radeon RX 560X) 8gb ram but its just 6.9gb ram usable?
This can only be "fixed" in the bios! But not all bios allow you to
change the pre-allocated memory of the video card, because there is a
risk of the notebook turning a brick! Can you take a picture of this
setting?
answered Nov 13 at 19:08
WinEunuuchs2Unix
39.3k1065147
From: Why my acer nitro 5 (AN515-42, Radeon RX 560X) 8gb ram but its just 6.9gb ram usable?
This can only be "fixed" in the bios! But not all bios allow you to
change the pre-allocated memory of the video card, because there is a
risk of the notebook turning a brick! Can you take a picture of this
setting?
answered Nov 13 at 19:08
WinEunuuchs2Unix
39.3k1065147
answered Nov 13 at 19:08
WinEunuuchs2Unix
39.3k1065147
answered Nov 13 at 19:08
WinEunuuchs2Unix
39.3k1065147
answered Nov 13 at 19:08
WinEunuuchs2Unix
39.3k1065147
39.3k1065147
add a comment |
add a comment |
up vote
0
down vote
Ubuntu is using your CPU's integrated graphics, which consumes ~1.1GB of system memory, whereas Windows is using the discrete graphics, which consumes no system memory.
I'm not sure why Ubuntu defaults to the iGPU, but you can possibly get it to use the dGPU by ensuring that your AMD GPU driver is up to date. If that does not work, you can try using the hybrid graphics feature to switch between GPUs, but do note that this feature is very experimental and very low-level and could easily prevent your Ubuntu install from booting if your hardware setup isn't correctly supported.
answered Nov 14 at 10:09
Ian Kemp
1012
Can you help me here : askubuntu.com/questions/1091846/… ?
– Abraham Francis
Nov 14 at 13:55
1
@cat uh, no. pcmag.com/encyclopedia/term/58834/discrete-graphics
– Ian Kemp
Nov 14 at 19:12
add a comment |
up vote
0
down vote
Ubuntu is using your CPU's integrated graphics, which consumes ~1.1GB of system memory, whereas Windows is using the discrete graphics, which consumes no system memory.
I'm not sure why Ubuntu defaults to the iGPU, but you can possibly get it to use the dGPU by ensuring that your AMD GPU driver is up to date. If that does not work, you can try using the hybrid graphics feature to switch between GPUs, but do note that this feature is very experimental and very low-level and could easily prevent your Ubuntu install from booting if your hardware setup isn't correctly supported.
answered Nov 14 at 10:09
Ian Kemp
1012
Can you help me here : askubuntu.com/questions/1091846/… ?
– Abraham Francis
Nov 14 at 13:55
1
@cat uh, no. pcmag.com/encyclopedia/term/58834/discrete-graphics
– Ian Kemp
Nov 14 at 19:12
add a comment |
up vote
0
down vote
up vote
0
down vote
Ubuntu is using your CPU's integrated graphics, which consumes ~1.1GB of system memory, whereas Windows is using the discrete graphics, which consumes no system memory.
I'm not sure why Ubuntu defaults to the iGPU, but you can possibly get it to use the dGPU by ensuring that your AMD GPU driver is up to date. If that does not work, you can try using the hybrid graphics feature to switch between GPUs, but do note that this feature is very experimental and very low-level and could easily prevent your Ubuntu install from booting if your hardware setup isn't correctly supported.
answered Nov 14 at 10:09
Ian Kemp
1012
Ubuntu is using your CPU's integrated graphics, which consumes ~1.1GB of system memory, whereas Windows is using the discrete graphics, which consumes no system memory.
I'm not sure why Ubuntu defaults to the iGPU, but you can possibly get it to use the dGPU by ensuring that your AMD GPU driver is up to date. If that does not work, you can try using the hybrid graphics feature to switch between GPUs, but do note that this feature is very experimental and very low-level and could easily prevent your Ubuntu install from booting if your hardware setup isn't correctly supported.
answered Nov 14 at 10:09
Ian Kemp
1012
answered Nov 14 at 10:09
Ian Kemp
1012
answered Nov 14 at 10:09
Ian Kemp
1012
answered Nov 14 at 10:09
Ian Kemp
1012
1012
Can you help me here : askubuntu.com/questions/1091846/… ?
– Abraham Francis
Nov 14 at 13:55
1
@cat uh, no. pcmag.com/encyclopedia/term/58834/discrete-graphics
– Ian Kemp
Nov 14 at 19:12
add a comment |
Can you help me here : askubuntu.com/questions/1091846/… ?
– Abraham Francis
Nov 14 at 13:55
1
@cat uh, no. pcmag.com/encyclopedia/term/58834/discrete-graphics
– Ian Kemp
Nov 14 at 19:12
Can you help me here : askubuntu.com/questions/1091846/… ?
– Abraham Francis
Nov 14 at 13:55
Can you help me here : askubuntu.com/questions/1091846/… ?
– Abraham Francis
Nov 14 at 13:55
1
1
@cat uh, no. pcmag.com/encyclopedia/term/58834/discrete-graphics
– Ian Kemp
Nov 14 at 19:12
@cat uh, no. pcmag.com/encyclopedia/term/58834/discrete-graphics
– Ian Kemp
Nov 14 at 19:12
add a comment |
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15
Some of the RAM is probably reserved for graphics.
– mikewhatever
Nov 13 at 15:40
see here
– Doug Smythies
Nov 13 at 15:46
But I have Radeon 560X (4GB VRAM), by default it is showing AMD Raven(the integrated graphics), can I change it to use Radeon? @mikewhatever
– Abraham Francis
Nov 13 at 15:48
1
But here there is a difference of more than 1 GB right? @Doug Smythies
– Abraham Francis
Nov 13 at 15:53
Well, edit your question and add the relevant stuff from
/var/log/kern.log. The answer I pointed you to was just so that you would know what to look for. See also here.– Doug Smythies
Nov 13 at 15:57