Toshiba Tecra R840 - brightness controls work on first boot, but do nothing after suspend/resume
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
linux (Ubuntu) |
Invalid
|
Undecided
|
Unassigned |
Bug Description
Overview -
This bug affects many Toshiba laptops including R700, R705, R800, R830, R835, R840, R850, Z930 models - please update this description if your model is also affected, but make sure the symptoms match exactly.
The symptoms are that brightness control operates normally when the system is first booted, but after a suspend-to-RAM and resume cycle the brightness controls have no effect.
After a normal reboot, or hibernate & resume cycle, the brightness controls operate normally again.
This bug is tracked for the kernel at:
http://
And for Debian at:
http://
Please try to keep all info together and pass any progress to the upstream trackers.
Original report for #935778 follows:
On my Toshiba R840, the brightness controls work fine on first boot,
but do nothing after suspend/resume. This is particularly frustrating
if I suspend with the screen at all dimmed, because once I resume, I
have no way of increasing the brightness short of a reboot.
ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: linux-image-generic 3.2.0.16.16
ProcVersionSign
Uname: Linux 3.2.0-16-generic x86_64
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
ApportVersion: 1.91-0ubuntu1
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/
/dev/snd/pcmC0D0p: james 2251 F...m pulseaudio
CRDA:
country EU:
(2402 - 2482 @ 40), (N/A, 20)
(5170 - 5250 @ 40), (N/A, 20)
(5250 - 5330 @ 40), (N/A, 20), DFS
(5490 - 5710 @ 40), (N/A, 27), DFS
Card0.Amixer.info:
Card hw:0 'PCH'/'HDA Intel PCH at 0xc4820000 irq 50'
Mixer name : 'Intel CougarPoint HDMI'
Components : 'HDA:10ec0269,
Controls : 30
Simple ctrls : 12
Date: Sat Feb 18 21:27:12 2012
EcryptfsInUse: Yes
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012)
MachineType: TOSHIBA TECRA R840
ProcEnviron:
LANGUAGE=en_GB:en
PATH=(custom, no user)
LANG=en_GB.UTF-8
SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=
RelatedPackageV
linux-
linux-
linux-firmware 1.69
RfKill:
0: phy0: Wireless LAN
Soft blocked: no
Hard blocked: no
SourcePackage: linux
StagingDrivers: mei
UpgradeStatus: Upgraded to precise on 2012-01-09 (39 days ago)
dmi.bios.date: 07/12/2011
dmi.bios.vendor: TOSHIBA
dmi.bios.version: Version 2.90
dmi.board.
dmi.board.name: Portable PC
dmi.board.vendor: TOSHIBA
dmi.board.version: Version A0
dmi.chassis.
dmi.chassis.type: 10
dmi.chassis.vendor: TOSHIBA
dmi.chassis.
dmi.modalias: dmi:bvnTOSHIBA:
dmi.product.name: TECRA R840
dmi.product.
dmi.sys.vendor: TOSHIBA
Changed in linux (Ubuntu): | |
status: | New → Confirmed |
Changed in linux (Ubuntu): | |
importance: | Undecided → Medium |
tags: | added: kernel-da-key |
Changed in linux (Ubuntu): | |
status: | Incomplete → In Progress |
summary: |
- Toshiba R840 - brightness controls work on first boot, but do nothing - after suspend/resume + Various Toshiba laptops - brightness controls work on first boot, but do + nothing after suspend/resume to RAM. |
description: | updated |
Changed in linux: | |
importance: | Unknown → Medium |
status: | Unknown → Confirmed |
Changed in debian: | |
status: | Unknown → Confirmed |
description: | updated |
Changed in opensuse: | |
importance: | Unknown → Medium |
status: | Unknown → Confirmed |
Changed in linux (Ubuntu): | |
status: | In Progress → Confirmed |
summary: |
- Various Toshiba laptops - brightness controls work on first boot, but do - nothing after suspend/resume to RAM. + Toshiba Tecra R840 - brightness controls work on first boot, but do + nothing after suspend/resume |
tags: |
added: needs-full-computer-model needs-upstream-testing removed: kernel-request-3.2.0-17.26 |
Changed in opensuse: | |
status: | Confirmed → Won't Fix |
Changed in fedora: | |
importance: | Unknown → Undecided |
status: | Unknown → Won't Fix |
Created an attachment (id=445026)
dmesg
User-Agent: Opera/9.80 (X11; Linux x86_64; U; de) Presto/2.9.168 Version/11.50
After a fresh restart the adjustment of the lcd brightness works correctly. After putting the system to suspend this won't work. Also after a second time putting to suspend it won't work.
Reproducible: Always
Steps to Reproduce:
1. Restart if you've done a suspend recently.
2. Try Adjusting brightness (on my Notebook using Fn+F6/F7), this should work.
3. Put the system to suspend mode.
4. Wake up the system from suspend and try the steps named in 2 again
Actual Results:
In both cases (before and after suspend) the KDE brightness widget is shown correctly but brightness won't change after suspend.
Expected Results:
Adjusting brightness should work like after a fresh restart.
System: 6-0.7-desktop / KDE 4.7
Toshiba Tecra R850-11M
openSuse 11.4 / 2.6.37.
The actual state is also after a suspend shown correctly in the following file:
cat /proc/acpi/ toshiba/ lcd
brightness: 5
brightness_levels: 8
When adjusting the brightness using the keys the value in the file above is actualized corrctly.
In /var/log/messages and dmesg (also as attachment) the following line appears:
Aug 9 20:38:02 linux-h81p kernel: [ 899.913018] ACPI: Failed to switch the brightness