Full RAM not detected (1.6GB / 2GB) (X86_64)
Hello
I've installed Fedora 23 on an old EeePC laptop on which 2GB of RAM is installed on one bank.
Linux does not detect the whole amount of memory. It's not related to PAE because I've got an x86-64 kernel. Only 1,6 GB of RAM is detected.
$ uname -a
Linux neptune 4.3.4-300.fc23.x86_64 #1 SMP Mon Jan 25 13:39:23 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux
$ free -h
total used free shared buff/cache available
Mem: 1,6G 920M 215M 150M 469M 472M
Swap: 1,5G 60M 1,5G
$ cat /proc/meminfo
MemTotal: 1643664 kB
MemFree: 220084 kB
MemAvailable: 483556 kB
Buffers: 22216 kB
Cached: 379392 kB
SwapCached: 1416 kB
Active: 615028 kB
Inactive: 573284 kB
Active(anon): 474636 kB
Inactive(anon): 466356 kB
Active(file): 140392 kB
Inactive(file): 106928 kB
Unevictable: 36 kB
Mlocked: 36 kB
SwapTotal: 1605628 kB
SwapFree: 1543868 kB
Dirty: 88 kB
Writeback: 0 kB
AnonPages: 785604 kB
Mapped: 323332 kB
Shmem: 154288 kB
Slab: 79684 kB
SReclaimable: 34944 kB
SUnreclaim: 44740 kB
KernelStack: 8272 kB
PageTables: 38892 kB
NFS_Unstable: 0 kB
Bounce: 0 kB
WritebackTmp: 0 kB
CommitLimit: 2427460 kB
Committed_AS: 4694444 kB
VmallocTotal: 34359738367 kB
VmallocUsed: 296464 kB
VmallocChunk: 34358947836 kB
HardwareCorrupted: 0 kB
AnonHugePages: 0 kB
HugePages_Total: 0
HugePages_Free: 0
HugePages_Rsvd: 0
HugePages_Surp: 0
Hugepagesize: 2048 kB
DirectMap4k: 339828 kB
DirectMap2M: 1345536 kB
DirectMap1G: 0 kB
Would you have any clue of what's going ? Thanks
This could be due to devices, like graphics card with shared memory to reserve space from RAM. A
lspci -v | lessand then search forMemoryshould give you hints.Have you double checked in your BIOS/UEFI interface to ensure that the motherboard firmware is at least detecting the proper amount of RAM?
Unless you're planning to add more RAM, you don't need an X64 system. Have you tried booting a LiveUSB with a 32 bit system and checking what it reports? If it also only finds 1.6 GB, it may be a hardware issue, although I'll admit that it's unlikely.
Find
Shared video Memory and/or RAMin BIOS and you have you answer.Thanks a lot for your replies.
@thomaswood : That is a good clue ! I got around 256MB for the VGA card itself ! @bitwiseoperator: yes, it's one of the firt thing I've checked and it's 2GB. A memtest runs at boot only detect 1.6GB.
@sideburns: thanks. I didn't have time/possibility to do it but I will.
@paulojmlopes: unfortunately, my BIOS seems limited. I don't have this option.
So, it's certainly due to shared memory with the graphics card. I will compare with my other laptop or other LInux PC.