[Expired for linux (Ubuntu) because there has been no activity for 60
days.]
** Changed in: linux (Ubuntu)
Status: Incomplete => Expired
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https://bugs.launchpad.net/bugs/1258495
Title:
8086:27ae [Acer AOA110] backlight too bright, can't dim it much
Status in “linux” package in Ubuntu:
Expired
Bug description:
Screen is far too bright, dims only slightly with hotkeys, brightness
control applet ineffective. Tried more than half a dozen solutions
(incl. editing the grub which used to work fine with Ubuntu 12.04) but
none of them worked.
thindi@thindi-AOA110:~$ ls /sys/class/backlight > backlight
thindi@thindi-AOA110:~$ grep -r . /proc/acpi > acpi
grep: /proc/acpi/event: Permission denied
thindi@thindi-AOA110:~$ sudo acpidump -o acpidump.txt
thindi@thindi-AOA110:~$ acpixtract acpidump.txt
Acpi table [DSDT] - 24038 bytes written to DSDT.dat
Acpi table [SSDT] - 1220 bytes written to SSDT.dat
thindi@thindi-AOA110:~$ iasl -d DSDT.dat
Intel ACPI Component Architecture
AML Disassembler version 20100528 [Dec 19 2012]
Copyright (c) 2000 - 2010 Intel Corporation
Supports ACPI Specification Revision 4.0a
Loading Acpi table from file DSDT.dat
Acpi table [DSDT] successfully installed and loaded
Pass 1 parse of [DSDT]
Pass 2 parse of [DSDT]
Parsing Deferred Opcodes (Methods/Buffers/Packages/Regions)
...................................................................................................................................................................................................................................................................................................................................................................
Parsing completed
Disassembly completed, written to "DSDT.dsl"
sudo fwts > fwts
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1258495/+attachment/3931116/+files/fwts
thindi@thindi-AOA110:~$ dmesg | grep 'ACPI: Video' > video
thindi@thindi-AOA110:~$ sudo dmidecode > dmidecode.log
thindi@thindi-AOA110:~$ cat /proc/version > version
Reboot with only the kernel parameter acpi_backlight=vendor:
If that means the grub file (excerpt) should look like this:
GRUB_DEFAULT=0
GRUB_HIDDEN_TIMEOUT=0
GRUB_HIDDEN_TIMEOUT_QUIET=true
GRUB_TIMEOUT=10
GRUB_DISTRIBUTOR=`lsb_release -i -s 2> /dev/null || echo Debian`
GRUB_CMDLINE_LINUX_DEFAULT="acpi_backlight=vendor"
GRUB_CMDLINE_LINUX=""
Make a comment on if you can now alter the backlight with hotkeys or a
brightness applet.
Neither do the job.
thindi@thindi-AOA110:~$ ls /sys/class/backlight > vendorbacklight
thindi@thindi-AOA110:~$ sudo su
root@thindi-AOA110:/home/thindi# ls -la /sys/class/backlight/intel_backlight/
> lslabacklight
root@thindi-AOA110:/home/thindi# echo 8 >
/sys/class/backlight/intel_backlight/brightness
No change after doing that.
o "Reboot with kernel parameter video.use_bios_initial_backlight=0"
Don't know how to do that.
Dealing with the rest on this site
https://wiki.ubuntu.com/Kernel/Debugging/Backlight is out of my depth.
ProblemType: Bug
DistroRelease: Ubuntu 13.10
Package: linux-image-3.11.0-14-generic 3.11.0-14.21
ProcVersionSignature: Ubuntu 3.11.0-14.21-generic 3.11.7
Uname: Linux 3.11.0-14-generic i686
ApportVersion: 2.12.5-0ubuntu2.1
Architecture: i386
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: thindi 1586 F.... pulseaudio
/dev/snd/pcmC0D0p: thindi 1586 F...m pulseaudio
Date: Fri Dec 6 11:31:38 2013
HibernationDevice: RESUME=UUID=9793476b-8516-4e8d-b628-0dd0389b1376
InstallationDate: Installed on 2013-12-03 (3 days ago)
InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release i386 (20131016.1)
MachineType: Acer AOA110
MarkForUpload: True
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.11.0-14-generic
root=UUID=bf6adaec-4e58-4748-95d7-8d287f559046 ro quiet splash pcie_aspm=force
acpi_backlight=vendor vt.handoff=7
RelatedPackageVersions:
linux-restricted-modules-3.11.0-14-generic N/A
linux-backports-modules-3.11.0-14-generic N/A
linux-firmware 1.116
RfKill:
0: phy0: Wireless LAN
Soft blocked: no
Hard blocked: no
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 10/06/2008
dmi.bios.vendor: Acer
dmi.bios.version: v0.3309
dmi.board.asset.tag: Base Board Asset Tag
dmi.board.vendor: Acer
dmi.board.version: Base Board Version
dmi.chassis.type: 1
dmi.chassis.vendor: Chassis Manufacturer
dmi.chassis.version: Chassis Version
dmi.modalias:
dmi:bvnAcer:bvrv0.3309:bd10/06/2008:svnAcer:pnAOA110:pvr1:rvnAcer:rn:rvrBaseBoardVersion:cvnChassisManufacturer:ct1:cvrChassisVersion:
dmi.product.name: AOA110
dmi.product.version: 1
dmi.sys.vendor: Acer
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