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[Shuhao <shuhao@xxxxxxxxxxxx>]

So I think I have an idea of what is happening..

Here's my sensors output:

acpitz-virtual-0
Adapter: Virtual device
temp1:        +56.0°C  (crit = +98.0°C)

thinkpad-isa-0000
Adapter: ISA adapter
fan1:        1978 RPM

coretemp-isa-0000
Adapter: ISA adapter
Physical id 0:  +57.0°C  (high = +86.0°C, crit = +100.0°C)
Core 0:         +50.0°C  (high = +86.0°C, crit = +100.0°C)
Core 1:         +53.0°C  (high = +86.0°C, crit = +100.0°C)

pkg-temp-0-virtual-0
Adapter: Virtual device
temp1:        +57.0°C  

The "high" temperature is at 86C. I notice the performance drop at
around 87C. (Still need to try to reproduce it again...)

The CPU clock frequency is not modified at 87C. The characteristics of
the performance drop is consistent with a lowered "Clock modulation",
something I've seen in programs that controls the CPU on windows.

Now this did not happen on a previous version of Linux. Previously when
I hit about 95C (which apparently is quite common for these laptops
after about 1-2 years of usage), the CPU frequency will be restricted to
800MHz, which would be the lowest frequency available.

So I'm not exactly sure what the best fix for this would be, or where
the "regression" happened. While 95C does not seem like a good idea, it
is actually quite easy, at least for me, to hit 87C on these thinkpads,
even after cleaning it out, replacing the thermal paste (multiple times
with no difference in results), and so forth.

I will try to get myself a fan mat and see if that helps things sometime
soon and confirm that this is indeed the issue.

-- 
You received this bug notification because you are a member of Kernel
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https://bugs.launchpad.net/bugs/1236653

Title:
  Graphics performance reduced after playing games for a little bit

Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  I recently upgraded to Saucy. I noticed that everytime I play
  something like Counter Strike Source, my graphics performance drops
  down to something like 15fps while normally it is locked at a max FPS
  of 40fps..

  This slowdown happens and also makes my computer generally pretty
  slow. Thermo maximum has not been tripped (I know, and I actually
  underclock while playing these games).

  I'm not sure why this is happening. It only happens on 13.10. I have
  bumblebee installed. I used both cards to play the game and the same
  thing happens

  ProblemType: Bug
  DistroRelease: Ubuntu 13.10
  Package: linux-image-3.11.0-11-generic 3.11.0-11.17
  ProcVersionSignature: Ubuntu 3.11.0-11.17-generic 3.11.3
  Uname: Linux 3.11.0-11-generic x86_64
  ApportVersion: 2.12.5-0ubuntu1
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  shuhao     2611 F.... pulseaudio
                        shuhao     4063 F.... plugin-containe
   /dev/snd/pcmC0D0p:   shuhao     4063 F...m plugin-containe
   /dev/snd/timer:      shuhao     4063 f.... plugin-containe
  Date: Mon Oct  7 20:39:17 2013
  HibernationDevice: RESUME=UUID=0c4e9477-6a74-48cb-a0e4-37bc3251580e
  InstallationDate: Installed on 2013-07-08 (91 days ago)
  InstallationMedia: Xubuntu 13.04 "Raring Ringtail" - Release amd64 (20130423.1)
  MachineType: LENOVO 4180J4C
  MarkForUpload: True
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.11.0-11-generic root=/dev/mapper/xubuntu--vg-root ro quiet splash i915.modeset=1 i915.i915_enable_rc6=1 i915.i915_enable_fbc=1 i915.lvds_downclock=1
  PulseList:
   Error: command ['pacmd', 'list'] failed with exit code 1: Failed to create secure directory (/run/user/1000/pulse): Permission denied
   No PulseAudio daemon running, or not running as session daemon.
  RelatedPackageVersions:
   linux-restricted-modules-3.11.0-11-generic N/A
   linux-backports-modules-3.11.0-11-generic  N/A
   linux-firmware                             1.116
  SourcePackage: linux
  UpgradeStatus: Upgraded to saucy on 2013-09-25 (12 days ago)
  dmi.bios.date: 05/17/2011
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 83ET57WW (1.27 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 4180J4C
  dmi.board.vendor: LENOVO
  dmi.board.version: Not Available
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Not Available
  dmi.modalias: dmi:bvnLENOVO:bvr83ET57WW(1.27):bd05/17/2011:svnLENOVO:pn4180J4C:pvrThinkPadT420:rvnLENOVO:rn4180J4C:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 4180J4C
  dmi.product.version: ThinkPad T420
  dmi.sys.vendor: LENOVO

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