this has been affecting me with the same laptop in arch and manjaro too
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https://bugs.launchpad.net/bugs/1875236
Title:
Different kernel gives different RAM results
Status in linux package in Ubuntu:
Confirmed
Bug description:
Kernel from installed distro doesn't recognize all available memory on my
laptop (Acer Swift 5 SF514-54T-59VD, Ubuntu Focal Fossa 20.04). When I load
Linux distro (Focal Fossa 20.04 release) from installation USB-stick Kernel
detects all memory (over 7Gb, part of memory used by graphic, on laptop
installed 8Gb memory). Kernel from installed distro shows only 1.5 Gb available
memory.
Output of commands for installed system:
$ lsb_release -a; uname -a; free -m
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 20.04 LTS
Release: 20.04
Codename: focal
Linux mxmaki 5.4.0-26-generic #30-Ubuntu SMP Mon Apr 20 16:58:30 UTC 2020
x86_64 x86_64 x86_64 GNU/Linux
total used free shared buff/cache available
Mem: 1628 806 110 163 711 498
Swap: 2047 24 2023
Output of commands for system from installation USB-stick:
$ lsb_release -a; uname -a; free -m
Distributor ID: Ubuntu
Description: Ubuntu 20.04 LTS
Release: 20.04
Codename: focal
Linux ubuntu 5.4.0-26-generic #30-Ubuntu SMP Mon Apr 20 16:58:30 UTC 2020
x86_64 x86_64 x86_64 GNU/Linux
total used free shared buff/cache available
Mem: 7641 763 3323 675 3554 5903
Swap: 0 0 0
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ProblemType: Bug
ApportVersion: 2.20.11-0ubuntu27
Architecture: amd64
AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq',
'/dev/snd/timer'] failed with exit code 1:
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
DistroRelease: Ubuntu 20.04
InstallationDate: Installed on 2020-04-18 (9 days ago)
InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Beta amd64 (20200417)
MachineType: Acer Swift SF514-54T
Package: linux (not installed)
ProcFB: 0 i915drmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.4.0-26-generic
root=UUID=52fa8c38-ee95-4b49-834a-f21af8e7e904 ro quiet splash vt.handoff=7
ProcVersionSignature: Ubuntu 5.4.0-26.30-generic 5.4.30
RelatedPackageVersions:
linux-restricted-modules-5.4.0-26-generic N/A
linux-backports-modules-5.4.0-26-generic N/A
linux-firmware 1.187
Tags: focal
Uname: Linux 5.4.0-26-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin lxd plugdev sambashare sudo
_MarkForUpload: True
dmi.bios.date: 12/19/2019
dmi.bios.vendor: Insyde Corp.
dmi.bios.version: V1.13
dmi.board.asset.tag: Type2 - Board Asset Tag
dmi.board.name: Yebisu_IL
dmi.board.vendor: IL
dmi.board.version: V1.13
dmi.chassis.type: 10
dmi.chassis.vendor: Acer
dmi.chassis.version: Chassis Version
dmi.modalias:
dmi:bvnInsydeCorp.:bvrV1.13:bd12/19/2019:svnAcer:pnSwiftSF514-54T:pvrV1.13:rvnIL:rnYebisu_IL:rvrV1.13:cvnAcer:ct10:cvrChassisVersion:
dmi.product.family: Swift 5
dmi.product.name: Swift SF514-54T
dmi.product.sku: 0000000000000000
dmi.product.version: V1.13
dmi.sys.vendor: Acer
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