Severe rendering glitches on HP EliteBook 2540p (i915)

[Krzysztof Kosinski]

After the upgrade to Ubuntu 12.04, many rendering glitches started to appear in the UI:

- the shadows appear to be painted over and over without redrawing things under it, so they eventually completely obscure the things below them; for example, the top panel will obscure the firefox tabbar, and mosuing over Dash will cause the shadows to become completely black
- there are transient 'gaps' in the launcher, ocyping roughly 1/3 of its height, where it is not rendered at all; the borders of the gaps are flickering and dynamic. a similar glitch happens in Dash
- the translucent background of the launcher is sometimes painted several times, so it appears darker than normal
- the top panel sometimes flickers

These issues do not make the system completely unusable, but complicate its use, especially the shadow problem.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: xserver-xorg-video-intel 2:2.17.0-1ubuntu4
ProcVersionSignature: Ubuntu 3.2.0-20.32-generic 3.2.12
Uname: Linux 3.2.0-20-generic x86_64
.tmp.unity.support.test.0:

ApportVersion: 1.95-0ubuntu1
Architecture: amd64
CompizPlugins: [core,bailer,detection,composite,opengl,decor,snap,regex,mousepoll,resize,compiztoolbox,imgpng,move,gnomecompat,unitymtgrabhandles,animation,expo,place,vpswitch,grid,workarounds,session,wall,fade,ezoom,scale,unityshell]
CompositorRunning: compiz
Date: Sat Mar 24 15:43:47 2012
DistUpgraded: 2012-03-24 15:08:08,446 DEBUG enabling apt cron job
DistroCodename: precise
DistroVariant: ubuntu
ExtraDebuggingInterest: Yes, whatever it takes to get this fixed in Ubuntu
MachineType: Hewlett-Packard HP EliteBook 2540p
PccardctlStatus:
 Socket 0:
   3.3V
  16-bit
  PC Card
   Subdevice 0 (function 0) bound to driver "pata_pcmcia"
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-20-generic root=UUID=53309d2a-6977-461e-a6de-02aafe133c14 ro quiet splash pcie_aspm=force vt.handoff=7
SourcePackage: xserver-xorg-video-intel
UpgradeStatus: Upgraded to precise on 2012-03-24 (0 days ago)
dmi.bios.date: 03/09/2011
dmi.bios.vendor: Hewlett-Packard
dmi.bios.version: 68CSU Ver. F.09
dmi.board.name: 7008
dmi.board.vendor: Hewlett-Packard
dmi.board.version: KBC Version 38.32
dmi.chassis.asset.tag: CZC1133C9G
dmi.chassis.type: 10
dmi.chassis.vendor: Hewlett-Packard
dmi.modalias: dmi:bvnHewlett-Packard:bvr68CSUVer.F.09:bd03/09/2011:svnHewlett-Packard:pnHPEliteBook2540p:pvr:rvnHewlett-Packard:rn7008:rvrKBCVersion38.32:cvnHewlett-Packard:ct10:cvr:
dmi.product.name: HP EliteBook 2540p
dmi.sys.vendor: Hewlett-Packard
version.compiz: compiz 1:0.9.7.2-0ubuntu1
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.32-1ubuntu1
version.libgl1-mesa-dri: libgl1-mesa-dri 8.0.2-0ubuntu2
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 8.0.2-0ubuntu2
version.xserver-xorg-core: xserver-xorg-core 2:1.11.4-0ubuntu7
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.7.0-0ubuntu1
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:6.14.99~git20111219.aacbd629-0ubuntu2
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.17.0-1ubuntu4
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:0.0.16+git20111201+b5534a1-1build2

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.