Brightness unchangeable via keyboard or brightness applet Acer Aspire 5750-9668
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
Linux |
Fix Released
|
Low
|
|||
linux (Ubuntu) |
Fix Released
|
Low
|
Unassigned |
Bug Description
1) lsb_release -rd
Description: Ubuntu precise (development branch)
Release: 12.04
lsb_release -rd
Description: Ubuntu oneiric (development branch)
Release: 11.10
2) uname -a
Linux monikerpc 3.4.0-030400rc1
apt-cache policy xfce4-power-
xfce4-power-
Installed: 1.0.10-4
Candidate: 1.0.10-4
Version table:
*** 1.0.10-4 0
500 http://
100 /var/lib/
uname -a
Linux monikerpc 3.0.0-12-
http://
uname -r 3.2.0-030200rc4
apt-cache policy xfce4-power-
xfce4-power-
Installed: 1.0.11-0ubuntu1
Candidate: 1.0.11-0ubuntu1
Version table:
*** 1.0.11-0ubuntu1 0
500 http://
100 /var/lib/
3) What is expected to happen when one presses the Fn key and the Left or Right arrow, the brightness goes up or down respectively.
4) What happens is the brightness does not change and remains at 100% no matter what.
WORKAROUND: Changing /etc/default/grub from:
GRUB_CMDLINE_
to:
GRUB_CMDLINE_
save, sudo update-grub then restarting allowed brightness applet or keyboard Fn and Right or Left to change brightness.
Following the debug info at:https:/
this issue falls into the "Backlight control does not work, but there are entries in /sys/class/
lsmod | grep thinkpad_acpi
does not yield any information.
No such path as: /proc/acpi/video
Following: https:/
sudo acpidump -o acpidump.txt && acpixtract acpidump.txt
Acpi table [DSDT] - 36436 bytes written to DSDT.dat
Acpi table [SSDT] - 3010 bytes written to SSDT1.dat
Acpi table [SSDT] - 2316 bytes written to SSDT2.dat
Acpi table [SSDT] - 2454 bytes written to SSDT3.dat
iasl -d DSDT.dat
Intel ACPI Component Architecture
AML Disassembler version 20100528 [Oct 15 2010]
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/
.......
Parsing completed
Found 5 external control methods, reparsing with new information
Pass 1 parse of [DSDT]
Pass 2 parse of [DSDT]
Parsing Deferred Opcodes (Methods/
.......
Parsing completed
Disassembly completed, written to "DSDT.dsl"
https:/
sudo fwts
https:/
sudo fwts method
https:/
Changing the "xfce4-
/sys/class/
/sys/class/
/sys/class/
/sys/class/
/sys/class/
/sys/class/
to:
/sys/class/
/sys/class/
/sys/class/
/sys/class/
/sys/class/
/sys/class/
Clicking on keyboard Fn and Left arrow together once goes from:
/sys/class/
/sys/class/
/sys/class/
/sys/class/
/sys/class/
/sys/class/
to:
grep . /sys/class/
/sys/class/
/sys/class/
/sys/class/
/sys/class/
/sys/class/
dmesg|grep 'ACPI: Video'
[ 4.181103] ACPI: Video Device [GFX0] (multi-head: yes rom: no post: no)
lspci |grep VGA
00:02.0 VGA compatible controller: Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller (rev 09)
ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: linux-image-
ProcVersionSign
Uname: Linux 3.0.0-12-
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
ApportVersion: 1.23-0ubuntu2
Architecture: i386
ArecordDevices:
**** List of CAPTURE Hardware Devices ****
card 0: PCH [HDA Intel PCH], device 0: ALC269VB Analog [ALC269VB Analog]
Subdevices: 1/1
Subdevice #0: subdevice #0
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/
CRDA: Error: [Errno 2] No such file or directory
Card0.Amixer.info:
Card hw:0 'PCH'/'HDA Intel PCH at 0xc0700000 irq 50'
Mixer name : 'Intel CougarPoint HDMI'
Components : 'HDA:10ec0269,
Controls : 20
Simple ctrls : 11
Date: Fri Sep 30 06:05:13 2011
EcryptfsInUse: Yes
InstallationMedia: Xubuntu 11.10 "Oneiric Ocelot" - Beta i386 (20110921.3)
MachineType: Acer Aspire 5750
ProcEnviron:
LANG=en_US.UTF-8
SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=
RelatedPackageV
linux-
linux-
linux-firmware 1.60
RfKill:
0: phy0: Wireless LAN
Soft blocked: no
Hard blocked: no
SourcePackage: linux
StagingDrivers: mei
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 02/11/2011
dmi.bios.vendor: Acer
dmi.bios.version: V1.05
dmi.board.
dmi.board.name: JE50_HR
dmi.board.vendor: Acer
dmi.board.version: Base Board Version
dmi.chassis.type: 10
dmi.chassis.vendor: Acer
dmi.chassis.
dmi.modalias: dmi:bvnAcer:
dmi.product.name: Aspire 5750
dmi.product.
dmi.sys.vendor: Acer
Changed in linux (Ubuntu): | |
status: | New → Confirmed |
description: | updated |
tags: | added: hw-specific kernel-acpi |
description: | updated |
description: | updated |
Changed in linux (Ubuntu): | |
status: | Incomplete → Confirmed |
tags: | removed: kernel-request-3.0.0-12.20 |
Changed in linux (Ubuntu): | |
status: | Confirmed → Incomplete |
tags: | added: kernel-request-3.0.0-12.20 |
Changed in linux (Ubuntu): | |
status: | Incomplete → Confirmed |
Changed in linux: | |
importance: | Unknown → Low |
status: | Unknown → Incomplete |
description: | updated |
tags: | added: bot-stop-nagging precise |
description: | updated |
tags: | added: acpi bios |
Changed in linux: | |
status: | Incomplete → Fix Released |
Marking to Low as this issue has more than enough information to demonstrate a bug but the root cause is to be determined.