Acer Aspire 5742g backlight brightness level is not saved on shutdown
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
linux (Ubuntu) |
Confirmed
|
Undecided
|
Unassigned |
Bug Description
Initial state: backlight brightness is at normal value. Booting to ubuntu, it's still fine. Reboot. Brightness level is set to the lowest possible value. Meanwhile /sys/class/
The problem appears since 13.04, every release before it including 12.10 and 12.04.2 with kernels up to 3.5.*. Moreover these releases automatically fix the wrong state.
Kernels from 3.8 don't work. I couldn't find any kernels between these versions, they are just disappeared from the wild. The problem also appears in other systems released after 2012 including FreeBSD, OpenBSD, Gentoo, CRUX and HaikuOS. Windows 7 works fine.
It's probably not the problem with radeon driver because I have the same issue with fglrx or without both.
When booting with acpi_backlight=
echo 8 > /sys/class/
Booting with video.use_
Booting with "acpi_osi=" partially fixes the issue: backlight is being restored to the maximal value but not saved on shutdown. Brightness controls work fine but MATE's widget doesn't display the level, only message "No External Display" (acpi_osi=Linux doesn't have this issue).
Booting with video.use_
Files from https:/
ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: linux-image-
ProcVersionSign
Uname: Linux 5.4.0-59-generic x86_64
ApportVersion: 2.20.11-
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/
/dev/snd/
CasperMD5CheckR
CurrentDesktop: MATE
Date: Sat Jan 23 12:26:04 2021
InstallationDate: Installed on 2021-01-04 (18 days ago)
InstallationMedia: Ubuntu-MATE 20.04.1 LTS "Focal Fossa" - Release amd64 (20200731)
MachineType: Acer Aspire 5742G
ProcFB: 0 radeondrmfb
ProcKernelCmdLine: BOOT_IMAGE=
RelatedPackageV
linux-
linux-
linux-firmware 1.187.7
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 08/13/2012
dmi.bios.vendor: Acer
dmi.bios.version: V1.30
dmi.board.
dmi.board.name: Aspire 5742G
dmi.board.vendor: Acer
dmi.board.version: V1.30
dmi.chassis.type: 10
dmi.chassis.vendor: Acer
dmi.chassis.
dmi.modalias: dmi:bvnAcer:
dmi.product.family: Intel_Mobile
dmi.product.name: Aspire 5742G
dmi.product.sku: Calpella_CRB
dmi.product.
dmi.sys.vendor: Acer
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