[Dell Inspiron 5721] Brightness control does not work with 12.04.5(with kernel 3.13)
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
HWE Next |
Fix Released
|
Undecided
|
Edward Lin | ||
linux (Ubuntu) |
Invalid
|
Undecided
|
Unassigned | ||
Precise |
Invalid
|
Undecided
|
Unassigned | ||
Trusty |
Fix Released
|
Undecided
|
Edward Lin | ||
Utopic |
Invalid
|
Undecided
|
Unassigned | ||
linux-lts-trusty (Ubuntu) |
Invalid
|
Undecided
|
Unassigned | ||
Precise |
Fix Released
|
Undecided
|
Edward Lin | ||
Trusty |
Invalid
|
Undecided
|
Unassigned | ||
Utopic |
Invalid
|
Undecided
|
Unassigned |
Bug Description
This is a system installed with latest stable 12.04.5 image.
The Brightness key will invoke the osd-notify indicator but the display brightness won't change.
Verifying the value changing in backlight interface, system are using acpi_video0 instead:
Steps to monitor the backlight interfaces:
Press the brightness key until maxium indicator shows:
ubuntu@
3407
99
ubuntu@
Press the brightness key until to minimum indicator shows:
ubuntu@
3407
0
-
The workaround found here could solve this issue:
http://
-
Verified with other kernels:
linux-image-generic 3.2.0.67.79 = brightness control works
linux-image-
There is possible regression in following kernels:
linux-image-
linux-image-
-
ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: xorg 1:7.6+12ubuntu2
ProcVersionSign
Uname: Linux 3.13.0-32-generic x86_64
.tmp.unity.
ApportVersion: 2.0.1-0ubuntu17.6
Architecture: amd64
CompizPlugins: [core,composite
CompositorRunning: compiz
Date: Fri Aug 8 03:51:43 2014
DistUpgraded: Fresh install
DistroCodename: precise
DistroVariant: ubuntu
DkmsStatus: fwts-efi-
ExtraDebuggingI
GraphicsCard:
Intel Corporation 3rd Gen Core processor Graphics Controller [8086:0166] (rev 09) (prog-if 00 [VGA controller])
Subsystem: Dell Device [1028:05ba]
Advanced Micro Devices, Inc. [AMD/ATI] Mars [Radeon HD 8730M] [1002:6601] (rev ff) (prog-if ff)
InstallationMedia: Ubuntu 12.04.5 LTS "Precise Pangolin" - Release amd64 (20140807.1)
MachineType: Dell Inc. Inspiron 5721
MarkForUpload: True
ProcEnviron:
TERM=xterm
PATH=(custom, no user)
LANG=en_US.UTF-8
SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=
SourcePackage: xorg
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 10/25/2013
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A12
dmi.board.name: 0KNF68
dmi.board.vendor: Dell Inc.
dmi.board.version: X01
dmi.chassis.type: 8
dmi.chassis.vendor: Dell Inc.
dmi.chassis.
dmi.modalias: dmi:bvnDellInc.
dmi.product.name: Inspiron 5721
dmi.product.
dmi.sys.vendor: Dell Inc.
version.compiz: compiz 1:0.9.7.12-0ubuntu4
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.52-1~precise1
version.
version.
version.
version.
version.
version.
version.
version.
no longer affects: | xorg (Ubuntu) |
Changed in hwe-next: | |
assignee: | nobody → Edward Lin (airken) |
Changed in linux-lts-trusty (Ubuntu): | |
assignee: | nobody → Edward Lin (airken) |
Changed in hwe-next: | |
status: | New → Triaged |
description: | updated |
Changed in linux-lts-trusty (Ubuntu): | |
status: | In Progress → Fix Committed |
Changed in linux (Ubuntu Utopic): | |
status: | New → Invalid |
Changed in linux-lts-trusty (Ubuntu Utopic): | |
status: | Fix Committed → Invalid |
Changed in linux-lts-trusty (Ubuntu Precise): | |
status: | New → Fix Committed |
Changed in linux-lts-trusty (Ubuntu Trusty): | |
status: | New → Invalid |
Changed in linux (Ubuntu Precise): | |
status: | New → Invalid |
Changed in linux (Ubuntu Trusty): | |
status: | New → Fix Committed |
Changed in linux-lts-trusty (Ubuntu Precise): | |
assignee: | nobody → Edward Lin (airken) |
Changed in linux-lts-trusty (Ubuntu Utopic): | |
assignee: | Edward Lin (airken) → nobody |
Changed in linux (Ubuntu Trusty): | |
assignee: | nobody → Edward Lin (airken) |
Changed in hwe-next: | |
status: | Triaged → Fix Released |
@kaxing
Can you add kernel parameter to grub without the workaround you found and test the backlight function again?
Either "acpi_video=vendor" or "video. use_native_ backlight= 1"