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 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/935965 Title: RC6 enabled causes severe graphics corruption To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/935965/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs