Toshiba R700 backlight control not always working
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
Linux |
Unknown
|
Unknown
|
|||
linux (Ubuntu) |
Triaged
|
Medium
|
Unassigned |
Bug Description
When returning from sleep mode, I lose backlight control via Fn-F7.
Restarting the system restores control.
I am running Ubuntu 14.04 64 bit.
~$ uname -psrv
Linux 3.13.0-37-generic #64-Ubuntu SMP Mon Sep 22 21:28:38 UTC 2014 x86_64
I could also adjust the brightness from the terminal:
~$ cat /sys/class/
1030
~$ grep . /sys/class/
/sys/class/
/sys/class/
/sys/class/
/sys/class/
So, to temporarily increase the screen brightness:
~$ echo 3030 | sudo tee /sys/class/
3030
But that does not give back control via Fn-F7, it just gives an independent way of adjusting the backlight.
ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: linux-image-
ProcVersionSign
Uname: Linux 3.13.0-37-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.5
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/
CRDA:
country PE:
(2402 - 2482 @ 40), (N/A, 20)
(5735 - 5835 @ 40), (N/A, 30)
CurrentDesktop: Unity
Date: Fri Oct 24 13:56:26 2014
HibernationDevice: RESUME=
InstallationDate: Installed on 2014-03-08 (229 days ago)
InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Alpha amd64 (20140304)
MachineType: TOSHIBA PORTEGE R700
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=
RelatedPackageV
linux-
linux-
linux-firmware 1.127.7
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 12/22/2011
dmi.bios.vendor: TOSHIBA
dmi.bios.version: Version 2.20
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: PORTEGE R700
dmi.product.
dmi.sys.vendor: TOSHIBA
Would it be possible for you to test the latest upstream kernel? Refer to https:/ /wiki.ubuntu. com/KernelMainl ineBuilds . Please test the latest v3.18 kernel[0].
If this bug is fixed in the mainline kernel, please add the following tag 'kernel- fixed-upstream' .
If the mainline kernel does not fix this bug, please add the tag: 'kernel- bug-exists- upstream' .
If you are unable to test the mainline kernel, for example it will not boot, please add the tag: 'kernel- unable- to-test- upstream' .
Once testing of the upstream kernel is complete, please mark this bug as "Confirmed".
Thanks in advance.
[0] http:// kernel. ubuntu. com/~kernel- ppa/mainline/ v3.18-rc1- utopic/