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[Bug 1393085] [NEW] Performance degraded and video glitches with i915 after upgrade to utopic


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After upgrading from trusty to utopic, I noticed a performance degradation in the video performance. In particular the flash plugin video (like youtube) starts OK but it degrades after a couple of seconds when in full screen, looking as if it was doing something like 10~15 fps with videos that worked fine before. When switching to windowed more again, the video goes more smoothly but the seek bar blinks and other parts of the video present some glitches. Also when switching from X to a console, via Ctrl-Alt-F1 for example, it takes like 2 seconds to get the console, and I see the below message in the console. When switching back to X is fast as usual, but when switching back to the console, again 2 seconds delay and the message:
[  184.436477] [drm:intel_enable_lvds] *ERROR* timed out waiting for panel to power on

Other weird looking messages are found in dmesg:
[    4.673834] [drm] GMBUS [i915 gmbus panel] timed out, falling back to bit banging on pin 3
[    4.732400] [drm] Wrong MCH_SSKPD value: 0x16040307
[    4.732404] [drm] This can cause pipe underruns and display issues.
[    4.732406] [drm] Please upgrade your BIOS to fix this.

WORKAROUND: Change intel_pscale cpufreq driver setting to performance
from powersave.

ProblemType: Bug
DistroRelease: Ubuntu 14.10
Package: xorg 1:7.7+7ubuntu2
ProcVersionSignature: Ubuntu 3.16.0-25.33-generic 3.16.7
Uname: Linux 3.16.0-25-generic x86_64

ApportVersion: 2.14.7-0ubuntu8
Architecture: amd64
CompizPlugins: [core,composite,opengl,compiztoolbox,decor,vpswitch,snap,mousepoll,resize,place,move,wall,grid,regex,imgpng,session,gnomecompat,animation,fade,workarounds,scale,expo,ezoom]
CompositorRunning: None
CurrentDesktop: Unity
Date: Sat Nov 15 22:52:27 2014
DistUpgraded: 2014-11-08 12:14:07,528 DEBUG enabling apt cron job
DistroCodename: utopic
DistroVariant: ubuntu
DkmsStatus: virtualbox, 4.3.18, 3.16.0-25-generic, x86_64: installed
ExtraDebuggingInterest: Yes
 Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller [8086:0116] (rev 09) (prog-if 00 [VGA controller])
   Subsystem: Toshiba America Info Systems Device [1179:0009]
InstallationDate: Installed on 2012-04-26 (933 days ago)
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64 (20120425)
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.16.0-25-generic root=UUID=36929bf3-a158-44d9-a80d-3adac2840fa8 ro quiet splash acpi_backlight=vendor pcie_aspm=force i915.enable_rc6=7 i915.enable_fbc=1 i915.lvds_downclock=1 vt.handoff=7
SourcePackage: xorg
Symptom: display
UpgradeStatus: Upgraded to utopic on 2014-11-08 (7 days ago)
dmi.bios.date: 04/18/2013
dmi.bios.vendor: TOSHIBA
dmi.bios.version: Version 1.80
dmi.board.asset.tag: 0000000000
dmi.board.name: Portable PC
dmi.board.vendor: TOSHIBA
dmi.board.version: Version A0
dmi.chassis.asset.tag: 0000000000
dmi.chassis.type: 10
dmi.chassis.vendor: TOSHIBA
dmi.chassis.version: Version 1.0
dmi.modalias: dmi:bvnTOSHIBA:bvrVersion1.80:bd04/18/2013:svnTOSHIBA:pnSATELLITEZ830:pvrPT22LE-00300GGR:rvnTOSHIBA:rnPortablePC:rvrVersionA0:cvnTOSHIBA:ct10:cvrVersion1.0:
dmi.product.name: SATELLITE Z830
dmi.product.version: PT22LE-00300GGR
dmi.sys.vendor: TOSHIBA
version.compiz: compiz 1:0.9.12+14.10.20140918-0ubuntu1
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.56-1
version.libgl1-mesa-dri: libgl1-mesa-dri 10.3.0-0ubuntu3
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 10.3.0-0ubuntu3
version.xserver-xorg-core: xserver-xorg-core 2:1.16.0-1ubuntu1
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.9.0-1ubuntu2
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.4.0-2ubuntu2
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.914-1~exp1ubuntu4.1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.11-1ubuntu2
xserver.bootTime: Sat Nov 15 22:40:14 2014
xserver.configfile: default

xserver.logfile: /var/log/Xorg.0.log

xserver.version: 2:1.16.0-1ubuntu1

** Affects: linux (Ubuntu)
     Importance: Low
         Status: Incomplete

** Tags: amd64 apport-bug latest-bios-1.80 performance regression-release ubuntu utopic
Performance degraded and video glitches with i915 after upgrade to utopic
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