Oneiric introduces severe flickering when adjusting brightness
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
xserver-xorg-video-ati (Ubuntu) |
Confirmed
|
Undecided
|
Unassigned |
Bug Description
A Samsung X125 subnotebook. Upgraded from Natty last night. First noticed this when pulling the AC power, brightness is reduced, as usual, but the brightness setting slides up and down like crazy.
After a while I also see this when adjusting brightness with the Fn + arrow keys.
My "solution" has been to force it all the way down or up, depending on my needs, by using the Fn + arrow keys. There is no specific amount of keypresses that finally makes the flickering stop and brightness to settle on either max or min brightness.
Have never experienced this bug before, so I'm assuming this is a regression.
ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: xorg 1:7.6+7ubuntu7
ProcVersionSign
Uname: Linux 3.0.0-12-generic i686
NonfreeKernelMo
.tmp.unity.
ApportVersion: 1.23-0ubuntu3
Architecture: i386
CompizPlugins: [core,bailer,
CompositorRunning: compiz
Date: Fri Oct 14 17:41:07 2011
DistUpgraded: Log time: 2011-10-13 21:54:19.706331
DistroCodename: oneiric
DistroVariant: ubuntu
DkmsStatus:
bcmwl, 5.100.82.38+bdcom, 3.0.0-12-generic, i686: installed
fglrx, 8.881, 3.0.0-12-generic, i686: installed
ExtraDebuggingI
GraphicsCard:
ATI Technologies Inc M880G [Mobility Radeon HD 4200] [1002:9712] (prog-if 00 [VGA controller])
Subsystem: Samsung Electronics Co Ltd Device [144d:c566]
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release i386 (20110427.1)
JockeyStatus:
xorg:fglrx_updates - ATI/AMD proprietary FGLRX graphics driver (post-release updates) (Proprietary, Disabled, Not in use)
kmod:wl - Broadcom STA wireless driver (Proprietary, Enabled, In use) [auto-install]
xorg:fglrx - ATI/AMD proprietary FGLRX graphics driver (Proprietary, Enabled, In use)
MachineType: SAMSUNG ELECTRONICS CO., LTD. X125
ProcEnviron:
LANGUAGE=en
PATH=(custom, no user)
LANG=nb_NO.UTF-8
LC_MESSAGES=
SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=
SourcePackage: xorg
Symptom: display
UpgradeStatus: Upgraded to oneiric on 2011-10-14 (0 days ago)
dmi.bios.date: 08/20/2010
dmi.bios.vendor: Phoenix Technologies Ltd.
dmi.bios.version: 02UP
dmi.board.name: X125
dmi.board.vendor: SAMSUNG ELECTRONICS CO., LTD.
dmi.board.version: Not Applicable
dmi.chassis.
dmi.chassis.type: 10
dmi.chassis.vendor: SAMSUNG ELECTRONICS CO., LTD.
dmi.chassis.
dmi.modalias: dmi:bvnPhoenixT
dmi.product.name: X125
dmi.product.
dmi.sys.vendor: SAMSUNG ELECTRONICS CO., LTD.
version.compiz: compiz 1:0.9.6+
version.
version.libdrm2: libdrm2 2.4.26-1ubuntu1
version.
version.
version.
version.
version.
version.
version.
version.
affects: | ubuntu → xorg (Ubuntu) |
affects: | xorg (Ubuntu) → xserver-xorg-video-ati (Ubuntu) |
tags: | added: flicker |
tags: | added: backlight |
This appears to have gotten rid of the flickering, but the side effect is that I'm now unable to adjust brightness at all. http:// www.voria. org/forum/ viewtopic. php?f=3& t=821&hilit= brightness+ flicker
In short:
1. edit the "/etc/modprobe. d/blacklist. conf":
at the end add this line: blacklist samsung_laptop
2. edit "/etc/default/ grub/" (if you are using grub 2): LINUX_DEFAULT= . add the following to the string: acpi_backlight= vendor
search the line with GRUB_CMDLINE_
3. execute update-grub
4. reboot your os