Vendor backlight on Lenovo Z580 having random hotkeys issues
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
linux (Ubuntu) |
Expired
|
Medium
|
Unassigned |
Bug Description
I've taken a bold guess in the title of this bug.
While investigating why on 14.04 LTS, I have working backlight on the latest 3.13 kernel, but not on the 3.16, I tried acpi_backlight=
With default boot parameters, I just get /sys/class/
With acpi_backlight=
The key point for this bug report is what happens with the lenovo one:
The hotkeys work and make the backlight change, but not consistently. Repeatedly using the hotkey to increase the brightness causes the level to increase, but then occasionally reset to zero (including resetting as shown in the OSD - i.e. the OSD is always showing the level that the backlight actually is).
Occasionally the OSD shows the "enable touchpad" icon when pressing the increase brightness hotkey repeatedly. The same action also causes the wifi to enable/disable randomly.
If I press the hotkey with pauses in between, things behave normally.
ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: linux-image-
ProcVersionSign
Uname: Linux 3.13.0-67-generic x86_64
NonfreeKernelMo
ApportVersion: 2.14.1-0ubuntu3.18
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/
CurrentDesktop: Unity
Date: Sun Nov 15 11:16:55 2015
HibernationDevice: RESUME=
InstallationDate: Installed on 2013-10-23 (752 days ago)
InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1)
MachineType: LENOVO IdeaPad Z580
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=
RelatedPackageV
linux-
linux-
linux-firmware 1.127.18
SourcePackage: linux
StagingDrivers: rts5139
UpgradeStatus: Upgraded to trusty on 2014-03-17 (607 days ago)
dmi.bios.date: 12/25/2012
dmi.bios.vendor: Phoenix Technologies Ltd.
dmi.bios.version: 5FCN95WW
dmi.board.
dmi.board.name: Lenovo
dmi.board.vendor: LENOVO
dmi.board.version: 31900003WIN8 STD MLT
dmi.chassis.
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.
dmi.modalias: dmi:bvnPhoenixT
dmi.product.name: IdeaPad Z580
dmi.product.
dmi.sys.vendor: LENOVO
This change was made by a bot.