[MacBook Pro 8,2] Severe screen flicker when display turned off an back on
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
Linux |
Fix Released
|
Medium
|
|||
linux (Ubuntu) |
Fix Released
|
Medium
|
Seth Forshee |
Bug Description
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-
ProcVersionSign
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/
/dev/snd/
Card0.Amixer.info:
Card hw:0 'PCH'/'HDA Intel PCH at 0xb0900000 irq 47'
Mixer name : 'Cirrus Logic CS4206'
Components : 'HDA:10134206,
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,
Controls : 6
Simple ctrls : 1
Card1.Amixer.
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=
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=
RelatedPackageV
linux-
linux-
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.
dmi.board.
dmi.board.name: Mac-94245A3940C
dmi.board.vendor: Apple Inc.
dmi.board.version: MacBookPro8,2
dmi.chassis.type: 10
dmi.chassis.vendor: Apple Inc.
dmi.chassis.
dmi.modalias: dmi:bvnAppleInc
dmi.product.name: MacBookPro8,2
dmi.product.
dmi.sys.vendor: Apple Inc.
Related branches
Changed in linux: | |
importance: | Unknown → Medium |
status: | Unknown → Fix Released |
Changed in linux (Ubuntu): | |
status: | In Progress → Fix Committed |
Created attachment 55810
dmesg output
When the LVDS panel is turned on after being off the screen flickers as if the backlight is quickly alternating between low and high brightness values. The flickering gradually fades until it is no longer noticeable. The graphics card is:
ATI Technologies Inc Whistler [AMD Radeon HD 6600M Series] [1002:6741]
Other than LVDS this machine has a Thunderbolt/MiniDP connector. demsg output and vbios are attached.