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Message #79556
[Bug 1354710] Re: Backlight control does not work, but there are entries in /sys/class/backlight. Lenovo B570
I can't build a bunch of test kernels because it requires the testing
result for the last kernel before the next kernel is built.
I built the next test kernel, up to the following commit:
4294dcf7e335da72fe81538c46b4a8e83037ea20
The test kernel can be downloaded from:
http://kernel.ubuntu.com/~jsalisbury/lp1354710
Can you test that kernel and report back if it has the bug or not? I
will build the next test kernel based on your test results.
Thanks in advance
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https://bugs.launchpad.net/bugs/1354710
Title:
Backlight control does not work, but there are entries in
/sys/class/backlight. Lenovo B570
Status in “linux” package in Ubuntu:
Confirmed
Bug description:
Laptop model: Lenovo B570
package version: Ubuntu 3.13.0-32.57-generic 3.13.11.4
I expected the keys for changeing the backlight brightness to work
they had no effect on the backlight
further details in attatched Tar
ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: linux-image-3.13.0-32-generic 3.13.0-32.57
ProcVersionSignature: Ubuntu 3.13.0-32.57-generic 3.13.11.4
Uname: Linux 3.13.0-32-generic i686
ApportVersion: 2.14.1-0ubuntu3.3
Architecture: i386
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: x321x321 1977 F.... pulseaudio
Date: Sat Aug 9 16:11:34 2014
HibernationDevice: RESUME=UUID=61c2c6a6-4b45-4af0-941a-dadf05ad0aba
InstallationDate: Installed on 2014-07-31 (8 days ago)
InstallationMedia: Xubuntu 14.04.1 LTS "Trusty Tahr" - Release i386 (20140723)
MachineType: LENOVO 1068FJG
ProcEnviron:
LANGUAGE=en_GB:en
TERM=xterm
PATH=(custom, no user)
LANG=en_GB.UTF-8
SHELL=/bin/bash
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.13.0-32-generic root=/dev/mapper/xubuntu--vg-root ro quiet splash vt.handoff=7
PulseList:
Error: command ['pacmd', 'list'] failed with exit code 1: Home directory not accessible: Permission denied
No PulseAudio daemon running, or not running as session daemon.
RelatedPackageVersions:
linux-restricted-modules-3.13.0-32-generic N/A
linux-backports-modules-3.13.0-32-generic N/A
linux-firmware 1.127.5
SourcePackage: linux
StagingDrivers: rts5139
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 07/11/2011
dmi.bios.vendor: LENOVO
dmi.bios.version: 44CN36WW
dmi.board.asset.tag: Base Board Asset Tag
dmi.board.name: Emerald Lake
dmi.board.vendor: LENOVO
dmi.board.version: FAB1
dmi.chassis.asset.tag: Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: 0.1
dmi.modalias: dmi:bvnLENOVO:bvr44CN36WW:bd07/11/2011:svnLENOVO:pn1068FJG:pvrLenovoB570:rvnLENOVO:rnEmeraldLake:rvrFAB1:cvnLENOVO:ct10:cvr0.1:
dmi.product.name: 1068FJG
dmi.product.version: Lenovo B570
dmi.sys.vendor: LENOVO
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References