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On 2010-09-24T10:23:54+00:00 Kokoko3k wrote:
Created attachment 38937
xorg log
Chipset: 945GM
Kernel version: 2.6.35 (same problem in 2.6.34 but not in 2.6.33)
Arch: i686
xorg-server: 1.8.1.902
mesa / intel-dri: 7.8.2
xf86-video-intel: 2.12.0
libdrm version: 2.4.21
Linux distribution: Arch linux (similar issues reported for fedora too)
Machine model: Asus 1005HA
Display Connector: LVDS (happens on VGA too)
Reproducible: Always
Step to reproduce:
---
Compile mesa demos
Launch teapot
Observe the framerate
Move the mouse around
Observe the framerate jumping
(in my case it went from 14~125 to 30 just by putting my finger on the touchpad)
Roll back to kernel 2.6.33
Launch teapot
Observe that there is no difference in framerate if you move the mouse around,
notice the framerate is "high" (30fps for me) in any case.
Even if just changing kernel version makes the bug disappear, i think it is
more logical to file a bug report here.
I i made i mistake, i apologize.
Reply at: https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-
intel/+bug/1087582/comments/0
On 2010-09-24T10:24:55+00:00 Kokoko3k wrote:
Created attachment 38938
dmesg log
Reply at: https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-
intel/+bug/1087582/comments/1
On 2010-09-24T10:26:22+00:00 Kokoko3k wrote:
Created attachment 38939
xorg.conf
Reply at: https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-
intel/+bug/1087582/comments/2
On 2010-09-24T10:32:28+00:00 Kokoko3k wrote:
Sorry for the typo:
"(in my case it went from 14~125[..]
Is:
"(in my case it went from 14~15[..]
Reply at: https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-
intel/+bug/1087582/comments/3
On 2010-09-24T10:41:03+00:00 Chris Wilson wrote:
Swapbuffer vs interrupts.
Reply at: https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-
intel/+bug/1087582/comments/4
On 2010-09-24T10:42:39+00:00 Chris Wilson wrote:
Is the teapot fullscreen? Are page-flips enabled? Is something disabling
the interrupts on your system?
Reply at: https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-
intel/+bug/1087582/comments/5
On 2010-09-24T10:44:52+00:00 Jesse Barnes wrote:
Looks like the processor c-state issue we have on some other 945
machines. If you boot with processor.max_cstate=1 does the problem go
away?
The issue is that we rely on vblank interrupts arriving at the correct
frequency, and on some platforms when the CPU is in a deep sleep state,
it won't wake up when a vblank interrupt arrives, but it will wake up
when other device interrupts arrive. That's why you see the performance
increase when you move the mouse.
I still don't know the root cause, but if the above works for you, then
it's a duplicate of a known bug at least.
Reply at: https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-
intel/+bug/1087582/comments/6
On 2010-09-24T11:13:12+00:00 Kokoko3k wrote:
(In reply to comment #5)
> Is the teapot fullscreen? Are page-flips enabled? Is something disabling the
> interrupts on your system?
I don't know how to make teapot runs in fullscreen mode, the best i've done was
to launch it in a empty X screen by xterm without any WM and the problem
persists.
With compiz enabled (and unredirect fullscreen windows) i was able to make it
fullscreen too with a shortcut, the problem persists.
Pagefilps were disabled in my system because of stability issues
(enabled in kernel, disabled in X), i tried to recompile the driver to
enable them again for a while and tried again, no success.
I can't say if something is blocking interrupts in my system, sorry,
anyway, listening to an mp3 in background helped a bit (fps went from 15
to 20 in teapot)
Reply at: https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-
intel/+bug/1087582/comments/7
On 2010-09-24T11:19:15+00:00 Kokoko3k wrote:
(In reply to comment #6)
> Looks like the processor c-state issue we have on some other 945 machines. If
> you boot with processor.max_c
