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Message #89558
[Bug 1392101] Re: Brightness controls not working on intel igfx
One other point of note, is after the "Turn off screen when inactive
for:" duration specified in the brightness & lock settings has ellapsed,
instead of turning off the screen, it goes black (without turning off),
and the mouse cursor is still visible. Yet, the hotkey for screen on/off
does still seem to work ok, oddly enough.
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https://bugs.launchpad.net/bugs/1392101
Title:
Brightness controls not working on intel igfx
Status in “linux” package in Ubuntu:
Incomplete
Bug description:
Brightness controls not working for me in Vivid Vervet as of 1-2 weeks ago.
Was confirmed working on Utopic Unicorn.
Hotkeys for brightness up & down non-functioning,
Hotkey for display on/off still works.
Gnome control center (brightness & lock) does not show brightness
slider.
What does work is
"echo $value > /sys/class/backlight/intel_backlight/brightness"
as root for any $value of 0 - 2047
Running on an Asus S400C Laptop.
kernel:
x86_64 3.16.0-24-generic
lspci:
00:02.0 VGA compatible controller: Intel Corporation 3rd Gen Core processor Graphics Controller (rev 09)
lsb_release:
Description: Ubuntu Vivid Vervet (development branch)
Release: 15.04
ProblemType: Bug
DistroRelease: Ubuntu 15.04
Package: linux-image-3.16.0-24-generic 3.16.0-24.32
ProcVersionSignature: Ubuntu 3.16.0-24.32-generic 3.16.4
Uname: Linux 3.16.0-24-generic x86_64
ApportVersion: 2.14.7-0ubuntu10
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: martin 1970 F.... pulseaudio
CurrentDesktop: Unity
Date: Wed Nov 12 16:06:27 2014
HibernationDevice: RESUME=UUID=a7b59988-1d75-4f19-8fd8-3c9a08c38e8d
InstallationDate: Installed on 2014-08-21 (83 days ago)
InstallationMedia: Ubuntu 14.10 "Utopic Unicorn" - Alpha amd64 (20140820)
MachineType: ASUSTeK COMPUTER INC. S400CA
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.16.0-24-generic.efi.signed root=UUID=e2aa386f-a710-4fb4-ba6e-5d233c6b7b25 ro quiet splash vt.handoff=7
RelatedPackageVersions:
linux-restricted-modules-3.16.0-24-generic N/A
linux-backports-modules-3.16.0-24-generic N/A
linux-firmware 1.138
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 01/27/2014
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: S400CA.210
dmi.board.asset.tag: ATN12345678901234567
dmi.board.name: S400CA
dmi.board.vendor: ASUSTeK COMPUTER INC.
dmi.board.version: 1.0
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: ASUSTeK COMPUTER INC.
dmi.chassis.version: 1.0
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrS400CA.210:bd01/27/2014:svnASUSTeKCOMPUTERINC.:pnS400CA:pvr1.0:rvnASUSTeKCOMPUTERINC.:rnS400CA:rvr1.0:cvnASUSTeKCOMPUTERINC.:ct10:cvr1.0:
dmi.product.name: S400CA
dmi.product.version: 1.0
dmi.sys.vendor: ASUSTeK COMPUTER INC.
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