Public bug reported:
Running current 12.04 (as of Sun Feb 19 01:15:24 EST 2012) and
experiencing severe graphics corruption with RC6 enabled. Appending
"i915.i915_enable_rc6=0" to the kernel command line upon reboot results
in a usable Unity session.
Processor Information
Socket Designation: CPU
Type: Central Processor
Family: Core i7
Manufacturer: Intel(R) Corporation
ID: A7 06 02 00 FF FB EB BF
Signature: Type 0, Family 6, Model 42, Stepping 7
ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: linux-image-3.2.0-17-generic 3.2.0-17.26
ProcVersionSignature: Ubuntu 3.2.0-17.26-generic 3.2.6
Uname: Linux 3.2.0-17-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/controlC0: crimsun 2157 F.... pulseaudio
/dev/snd/pcmC0D0p: crimsun 2157 F...m pulseaudio
CRDA: Error: [Errno 2] No such file or directory
Card0.Amixer.info:
Card hw:0 'PCH'/'HDA Intel PCH at 0xc0800000 irq 55'
Mixer name : 'Intel CougarPoint HDMI'
Components : 'HDA:10ec0269,144dc0b3,00100202
HDA:80862805,80860101,00100000'
Controls : 24
Simple ctrls : 11
Date: Sun Feb 19 01:13:40 2012
EcryptfsInUse: Yes
HibernationDevice: RESUME=UUID=e98aa071-f1fc-44b7-afcc-4fbc8e1e1564
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Alpha amd64 (20120129)
MachineType: SAMSUNG ELECTRONICS CO., LTD. 700Z3A/700Z4A/700Z5A/700Z5B
ProcEnviron:
PATH=(custom, no user)
LANG=en_US.UTF-8
SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.2.0-17-generic
root=/dev/mapper/hostname-root ro quiet splash i915.i915_enable_rc6=0
vt.handoff=7
RelatedPackageVersions:
linux-restricted-modules-3.2.0-17-generic N/A
linux-backports-modules-3.2.0-17-generic N/A
linux-firmware 1.69
RfKill:
0: phy0: Wireless LAN
Soft blocked: no
Hard blocked: no
SourcePackage: linux
StagingDrivers: mei
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 09/06/2011
dmi.bios.vendor: Phoenix Technologies Ltd.
dmi.bios.version: 03FD
dmi.board.asset.tag: Base Board Asset Tag
dmi.board.name: 700Z3A/700Z4A/700Z5A/700Z5B
dmi.board.vendor: SAMSUNG ELECTRONICS CO., LTD.
dmi.board.version: FAB1
dmi.chassis.asset.tag: Asset Tag
dmi.chassis.type: 9
dmi.chassis.vendor: SAMSUNG ELECTRONICS CO., LTD.
dmi.chassis.version: 0.1
dmi.modalias:
dmi:bvnPhoenixTechnologiesLtd.:bvr03FD:bd09/06/2011:svnSAMSUNGELECTRONICSCO.,LTD.:pn700Z3A/700Z4A/700Z5A/700Z5B:pvr0.1:rvnSAMSUNGELECTRONICSCO.,LTD.:rn700Z3A/700Z4A/700Z5A/700Z5B:rvrFAB1:cvnSAMSUNGELECTRONICSCO.,LTD.:ct9:cvr0.1:
dmi.product.name: 700Z3A/700Z4A/700Z5A/700Z5B
dmi.product.version: 0.1
dmi.sys.vendor: SAMSUNG ELECTRONICS CO., LTD.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: Confirmed
** Tags: amd64 apport-bug precise staging
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https://bugs.launchpad.net/bugs/935965
Title:
RC6 enabled causes severe graphics corruption
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