This change was made by a bot.
** Changed in: linux (Ubuntu)
Status: New => Confirmed
** Tags added: saucy
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https://bugs.launchpad.net/bugs/1272124
Title:
Backlight control does not work on linux mint - acer aspire 5741
Status in “linux” package in Ubuntu:
Confirmed
Bug description:
Backlight control does not work, but there are entries in
/sys/class/backlight
System: linux Mint 16 on Acer Aspire 5741
I will follow the debugging method on:
https://wiki.ubuntu.com/Kernel/Debugging/Backlight
1) ls /sys/class/backlight
acer-wmi intel_backlight
2) grep -r . /proc/acpi
/proc/acpi/button/lid/LID0/state:state: open
grep: /proc/acpi/event: Dispositivo o risorsa occupata
/proc/acpi/wakeup:Device S-state Status Sysfs node
/proc/acpi/wakeup:AZAL S3 *disabled pci:0000:00:1b.0
/proc/acpi/wakeup:P0P1 S4 *disabled pci:0000:00:1e.0
/proc/acpi/wakeup:EHC1 S3 *enabled pci:0000:00:1d.0
/proc/acpi/wakeup:USB1 S3 *disabled
/proc/acpi/wakeup:USB2 S3 *disabled
/proc/acpi/wakeup:USB3 S3 *disabled
/proc/acpi/wakeup:USB4 S3 *disabled
/proc/acpi/wakeup:USB5 S3 *disabled
/proc/acpi/wakeup:USB6 S3 *disabled
/proc/acpi/wakeup:USB7 S3 *disabled
/proc/acpi/wakeup:RP01 S4 *disabled pci:0000:00:1c.0
/proc/acpi/wakeup:PEG5 S4 *disabled
3) dmesg | grep 'ACPI: Video' > video
[ 8.291555] ACPI: Video Device [GFX0] (multi-head: yes rom: yes post: no)
4)/proc/version
Linux version 3.11.0-12-generic (buildd@allspice) (gcc version 4.8.1
(Ubuntu/Linaro 4.8.1-10ubuntu7) ) #19-Ubuntu SMP Wed Oct 9 16:20:46 UTC 2013
5) reboot with only the kernel parameter acpi_backlight=vendor
now its disappeared also the OSD info
6)ls -la /sys/class/backlight/intel_backlight
lrwxrwxrwx 1 root root 0 gen 23 23:56 /sys/class/backlight/intel_backlight ->
../../devices/pci0000:00/0000:00:02.0/drm/card0/card0-LVDS-1/intel_backlight
7)Reboot with just kernel parameter video.use_bios_initial_backlight=0
nothing change (but the OSD is returned)
8) echo 8 | sudo tee /sys/class/backlight/intel_backlight/brightness
it's works..
9)showkey -s
fn+left (0x...)
e0 4c e0 cc
e0 56 e0 d6
fn+right (0x...)
e0 54 e0 d4
10) ... any ideas?
ps: i've attached the intel acpi info DTDT.dsl
ProblemType: Bug
DistroRelease: Ubuntu 13.10
Package: linux-image-3.11.0-12-generic 3.11.0-12.19
ProcVersionSignature: Ubuntu 3.11.0-12.19-generic 3.11.3
Uname: Linux 3.11.0-12-generic x86_64
ApportVersion: 2.12.5-0ubuntu2.2
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: tia 1844 F.... pulseaudio
Date: Fri Jan 24 00:25:00 2014
HibernationDevice: RESUME=UUID=1f0244d2-61fe-4fd4-9a24-f425d6811bf2
InstallationDate: Installed on 2014-01-23 (0 days ago)
InstallationMedia: Linux Mint 16 "petra" - Release amd64 20131126
MachineType: Acer Aspire 5741
MarkForUpload: True
ProcEnviron:
TERM=xterm
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=it_IT.UTF-8
SHELL=/bin/bash
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.11.0-12-generic
root=UUID=13480b77-86cb-4a3d-b2ea-a4006b469683 ro quiet splash
acpi_backlight=vendor vt.handoff=7
RelatedPackageVersions:
linux-restricted-modules-3.11.0-12-generic N/A
linux-backports-modules-3.11.0-12-generic N/A
linux-firmware 1.116
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 04/22/2010
dmi.bios.vendor: Acer
dmi.bios.version: V1.06
dmi.board.asset.tag: Base Board Asset Tag
dmi.board.name: Aspire 5741
dmi.board.vendor: Acer
dmi.board.version: V1.06
dmi.chassis.type: 10
dmi.chassis.vendor: Acer
dmi.chassis.version: V1.06
dmi.modalias:
dmi:bvnAcer:bvrV1.06:bd04/22/2010:svnAcer:pnAspire5741:pvrV1.06:rvnAcer:rnAspire5741:rvrV1.06:cvnAcer:ct10:cvrV1.06:
dmi.product.name: Aspire 5741
dmi.product.version: V1.06
dmi.sys.vendor: Acer
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