Public bug reported:
Since RC6 power saving was enabled by default, disconnecting the power
cable causes flickering in the screen. The problem is solved by
disabling RC6 power saving in the kernel parameters. This is done by
adding "i915.i915_enable_rc6=0" to the GRUB_CMDLINE_LINUX_DEFAULT
variable in /etc/default/grub and by running
sudo update-grub
I am filing this bug report so that you know the problem exists with this
particular hardware configuration:
Computer: EEE PC 1001PX
Graphics: Intel Corporation N10 Family Integrated Graphics Controller
Ubuntu: 12.04, 32 bits
Kernel: 3.2.0-29-generic-pae
I am using "ubuntu-bug linux" to file the bug, so I assume you have
already all the relevant information
ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: linux-image-3.2.0-29-generic-pae 3.2.0-29.46
ProcVersionSignature: Ubuntu 3.2.0-29.46-generic-pae 3.2.24
Uname: Linux 3.2.0-29-generic-pae i686
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
AplayDevices:
**** List of PLAYBACK Hardware Devices ****
card 0: Intel [HDA Intel], device 0: ALC269VB Analog [ALC269VB Analog]
Subdevices: 0/1
Subdevice #0: subdevice #0
ApportVersion: 2.0.1-0ubuntu12
Architecture: i386
ArecordDevices:
**** List of CAPTURE Hardware Devices ****
card 0: Intel [HDA Intel], device 0: ALC269VB Analog [ALC269VB Analog]
Subdevices: 1/1
Subdevice #0: subdevice #0
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: giampi 1689 F.... pulseaudio
/dev/snd/pcmC0D0p: giampi 1689 F...m pulseaudio
Card0.Amixer.info:
Card hw:0 'Intel'/'HDA Intel at 0xf7cf8000 irq 45'
Mixer name : 'Realtek ALC269VB'
Components : 'HDA:10ec0269,10438437,00100100'
Controls : 13
Simple ctrls : 8
Date: Tue Aug 28 09:41:13 2012
HibernationDevice: RESUME=UUID=70fefe68-bbe7-4083-9663-fd32cdb604dc
InstallationMedia: Ubuntu-Netbook 10.10 "Maverick Meerkat" - Release i386
(20101007)
MachineType: ASUSTeK Computer INC. 1001PX
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-29-generic-pae
root=UUID=a36ef87b-13ea-4ce2-bac3-ebf4d415e6ef ro quiet splash
i915.i915_enable_rc6=0 vt.handoff=7
RelatedPackageVersions:
linux-restricted-modules-3.2.0-29-generic-pae N/A
linux-backports-modules-3.2.0-29-generic-pae N/A
linux-firmware 1.79
SourcePackage: linux
UpgradeStatus: Upgraded to precise on 2012-05-05 (114 days ago)
dmi.bios.date: 08/12/2010
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 0904
dmi.board.asset.tag: To Be Filled By O.E.M.
dmi.board.name: 1001PX
dmi.board.vendor: ASUSTeK Computer INC.
dmi.board.version: x.xx
dmi.chassis.asset.tag: 0x00000000
dmi.chassis.type: 10
dmi.chassis.vendor: ASUSTeK Computer INC.
dmi.chassis.version: x.x
dmi.modalias:
dmi:bvnAmericanMegatrendsInc.:bvr0904:bd08/12/2010:svnASUSTeKComputerINC.:pn1001PX:pvrx.x:rvnASUSTeKComputerINC.:rn1001PX:rvrx.xx:cvnASUSTeKComputerINC.:ct10:cvrx.x:
dmi.product.name: 1001PX
dmi.product.version: x.x
dmi.sys.vendor: ASUSTeK Computer INC.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: apport-bug i386 precise running-unity
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https://bugs.launchpad.net/bugs/1042613
Title:
intel graphics rc6 power saving causes flickering
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