Public bug reported:
When the radeon driver is used, turning the LVDS panel off then back on
results in extreme flicker on the screen, as though the backlight
intensity is quickly cycling between low and high brightness. This
effect gradually fades until it is no longer noticable.
fglrx does not suffer from this issue.
ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: linux-image-3.2.0-12-generic 3.2.0-12.21
ProcVersionSignature: Ubuntu 3.2.0-12.21-generic 3.2.2
Uname: Linux 3.2.0-12-generic x86_64
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
ApportVersion: 1.91-0ubuntu1
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC1: ubuntu 1743 F.... pulseaudio
/dev/snd/controlC0: ubuntu 1743 F.... pulseaudio
Card0.Amixer.info:
Card hw:0 'PCH'/'HDA Intel PCH at 0xb0900000 irq 47'
Mixer name : 'Cirrus Logic CS4206'
Components : 'HDA:10134206,106b1d00,00100302'
Controls : 24
Simple ctrls : 10
Card1.Amixer.info:
Card hw:1 'Generic'/'HD-Audio Generic at 0xb0840000 irq 48'
Mixer name : 'ATI R6xx HDMI'
Components : 'HDA:1002aa01,00aa0100,00100200'
Controls : 6
Simple ctrls : 1
Card1.Amixer.values:
Simple mixer control 'IEC958',0
Capabilities: pswitch pswitch-joined penum
Playback channels: Mono
Mono: Playback [on]
Date: Thu Feb 2 09:39:42 2012
HibernationDevice: RESUME=UUID=13594e7c-281a-4c68-afc8-7ef8aae830c9
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Alpha amd64+mac
(20111208)
MachineType: Apple Inc. MacBookPro8,2
ProcEnviron:
PATH=(custom, no user)
LANG=en_US.UTF-8
SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-12-generic
root=UUID=b914ccd7-a73e-4a8b-97b2-4b23a1d3d39c ro acpi_backlight=vendor quiet
splash vt.handoff=7
RelatedPackageVersions:
linux-restricted-modules-3.2.0-12-generic N/A
linux-backports-modules-3.2.0-12-generic N/A
linux-firmware 1.68
SourcePackage: linux
StagingDrivers: mei
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 09/28/11
dmi.bios.vendor: Apple Inc.
dmi.bios.version: MBP81.88Z.0047.B22.1109281426
dmi.board.asset.tag: Base Board Asset Tag#
dmi.board.name: Mac-94245A3940C91C80
dmi.board.vendor: Apple Inc.
dmi.board.version: MacBookPro8,2
dmi.chassis.type: 10
dmi.chassis.vendor: Apple Inc.
dmi.chassis.version: Mac-94245A3940C91C80
dmi.modalias:
dmi:bvnAppleInc.:bvrMBP81.88Z.0047.B22.1109281426:bd09/28/11:svnAppleInc.:pnMacBookPro8,2:pvr1.0:rvnAppleInc.:rnMac-94245A3940C91C80:rvrMacBookPro8,2:cvnAppleInc.:ct10:cvrMac-94245A3940C91C80:
dmi.product.name: MacBookPro8,2
dmi.product.version: 1.0
dmi.sys.vendor: Apple Inc.
** Affects: linux
Importance: Unknown
Status: Unknown
** Affects: linux (Ubuntu)
Importance: Medium
Assignee: Seth Forshee (sforshee)
Status: In Progress
** Tags: amd64 apport-bug precise running-unity staging
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https://bugs.launchpad.net/bugs/925538
Title:
[MacBook Pro 8,2] Severe screen flicker when display turned off an
back on
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