8086:2a42 [Asus UL80VT] Backlight control does not work with Intel integrated card, but there are entries in /sys/class/backlight
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
Linux |
Incomplete
|
Medium
|
|||
linux (Ubuntu) |
Triaged
|
Low
|
Unassigned |
Bug Description
It used to work with the workaround suggested at http://
But I had forgotten that workaround and I suspect that upgrading to Raring removed my modified scripts. So, in the original description of the bug, I thought it was a regression. But it's probably not a regression as the brightness control has apparently never worked off-the-shelf.
Not working neither with linux-image-
Hotkeys are detected, showkey -s:
Fn+F5:
0xe0 0x4c 0xe0 0xcc
Fn+F6:
0xe0 0x54 0xe0 0xd4
I also attach the results from tests described on https:/
Test with acpi_backlight=
- on 3.8.0-20.
- on 3.9.1, no brightness change but the KDE notification pops up with only 3 levels (0, 53, 100%)
Test with video.use_
- on 3.8.0-20.
WORKAROUND: specify the backlight option in xorg.conf.
Section "Device"
Identifier "Default Device"
Option "Backlight" "intel_backlight"
Driver "intel"
BusID "PCI:0:2:0"
EndSection
WORKAROUND: On KDE Raring Ubuntu 3.8.0-30.
The plasma widget for screen brightness (inside battery monitor widget) is able to change the brightness. And automatic brightness change from KDE system (when the power adaptor is unplugged) works also. In Raring, the hotkeys do not trigger any change (see bug #1225067) but this is fixed in Saucy.
ProblemType: Bug
DistroRelease: Ubuntu 13.04
Package: linux-image-
ProcVersionSign
Uname: Linux 3.8.0-20-generic x86_64
ApportVersion: 2.9.2-0ubuntu8
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/
/dev/snd/
Date: Fri May 10 12:14:58 2013
HibernationDevice: RESUME=/dev/sda6
InstallationDate: Installed on 2010-01-19 (1207 days ago)
InstallationMedia: Kubuntu 9.10 "Karmic Koala" - Release amd64 (20091027)
MachineType: ASUSTeK Computer Inc. UL80VT
MarkForUpload: True
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=
RelatedPackageV
linux-
linux-
linux-firmware 1.106
SourcePackage: linux
UpgradeStatus: Upgraded to raring on 2013-04-27 (12 days ago)
dmi.bios.date: 01/17/2011
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 214
dmi.board.
dmi.board.name: UL80VT
dmi.board.vendor: ASUSTeK Computer Inc.
dmi.board.version: 1.0
dmi.chassis.
dmi.chassis.type: 10
dmi.chassis.vendor: ASUSTeK Computer Inc.
dmi.chassis.
dmi.modalias: dmi:bvnAmerican
dmi.product.name: UL80VT
dmi.product.
dmi.sys.vendor: ASUSTeK Computer Inc.
---
ApportVersion: 2.12-0ubuntu3
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/
/dev/snd/
CasperVersion: 1.336
DistroRelease: Ubuntu 13.10
LiveMediaBuild: Ubuntu 13.10 "Saucy Salamander" - Alpha amd64 (20130813)
MachineType: ASUSTeK Computer Inc. UL80VT
MarkForUpload: True
Package: linux (not installed)
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: noprompt cdrom-detect/
ProcVersionSign
RelatedPackageV
linux-
linux-
linux-firmware 1.113
Tags: saucy
Uname: Linux 3.11.0-1-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
dmi.bios.date: 01/17/2011
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 214
dmi.board.
dmi.board.name: UL80VT
dmi.board.vendor: ASUSTeK Computer Inc.
dmi.board.version: 1.0
dmi.chassis.
dmi.chassis.type: 10
dmi.chassis.vendor: ASUSTeK Computer Inc.
dmi.chassis.
dmi.modalias: dmi:bvnAmerican
dmi.product.name: UL80VT
dmi.product.
dmi.sys.vendor: ASUSTeK Computer Inc.
Changed in linux (Ubuntu): | |
status: | Incomplete → Confirmed |
summary: |
- On Asus laptop UL80VT, backlight control does not work, but there are - entries in /sys/class/backlight + [Asus UL80VT] Backlight control does not work, but there are entries in + /sys/class/backlight |
tags: | added: latest-bios-214 |
tags: |
added: kernel-bug-exists-upstream-v3.11-rc1 needs-upstream-testing removed: kernel-bug-exists-upstream |
Changed in linux (Ubuntu): | |
status: | Confirmed → Incomplete |
tags: |
added: kernel-bug-exists-upstream-v3.11-rc3 removed: kernel-bug-exists-upstream-v3.11-rc1 needs-upstream-testing |
tags: | added: needs-bisect |
description: | updated |
tags: |
added: precise removed: needs-bisect regression-release |
tags: | removed: precise |
description: | updated |
summary: |
- [Asus UL80VT] Backlight control does not work, but there are entries in - /sys/class/backlight + 8086:2a42 [Asus UL80VT] Backlight control does not work with Intel + integrated card, but there are entries in /sys/class/backlight |
Changed in linux (Ubuntu): | |
status: | Incomplete → Confirmed |
description: | updated |
description: | updated |
tags: | added: lucid |
tags: |
added: kernel-bug-exists-upstream-v3.12 removed: kernel-bug-exists-upstream-v3.11 |
Changed in linux (Ubuntu): | |
status: | Expired → Incomplete |
tags: |
added: kernel-bug-exists-upstream-v3.13-rc2 removed: kernel-bug-exists-upstream-v3.12 needs-upstream-testing |
description: | updated |
Changed in linux: | |
importance: | Unknown → Medium |
status: | Unknown → Incomplete |
sudo fwts
Running 42 tests, results appended to results.log
sudo fwts method
Running 1 tests, results appended to results.log