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[Bug Watch Updater <849782@xxxxxxxxxxxxxxxxxx>]

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On 2011-10-12T21:35:08+00:00 Bryce Harrington wrote:

Forwarding this bug from Ubuntu reporter Jonathan Lange:
http://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/849782

[Problem]
When system is under load, the graphics experience periodic glitches.

Perhaps under the load of oneiric's Unity3D the driver isn't able to
keep up with the graphics loads, and isn't able to fill the pipe 100% of
the time?  How could that be proved/disproved (or are we way off base?)

[Original Description]
I have a Lenovo X200 laptop, and I run Unity 3D. Every so often, since oneiric, my screen jitters. That is, it seems to jump up and down like it has a nervous twitch. I can't reproduce it exactly, but it seems more likely to happen when my system is under load.

I've monitored .xsession-errors when the twitch happens, and nothing is
dumped there. I've also checked /var/crash/, but none of the crashes
there have times that match the twitch.

Chris Halse Rogers suggested trying, "echo 0 >
/sys/module/drm_kms_helper/parameters/poll", but that doesn't seem to
correct the problem.

In addition, unity_support_test crashed while filing this bug.

DistroRelease: Ubuntu 11.10
Package: xserver-xorg 1:7.6+7ubuntu7
ProcVersionSignature: Ubuntu 3.0.0-10.16-generic 3.0.4
Uname: Linux 3.0.0-10-generic x86_64
.tmp.unity.support.test.0:
 
ApportVersion: 1.22.1-0ubuntu2
Architecture: amd64
CompizPlugins: [core,bailer,detection,composite,opengl,compiztoolbox,decor,mousepoll,resize,gnomecompat,place,wall,vpswitch,move,regex,snap,session,animation,expo,workarounds,ezoom,staticswitcher,fade,scale,unityshell]
CompositorRunning: compiz
Date: Wed Sep 14 09:31:23 2011
DistUpgraded: Log time: 2011-07-26 11:37:40.528783
DistroCodename: oneiric
DistroVariant: ubuntu
EcryptfsInUse: Yes
ExtraDebuggingInterest: Yes, whatever it takes to get this fixed in Ubuntu
GlAlternative: lrwxrwxrwx 1 root root 24 2010-03-20 18:53 /etc/alternatives/gl_conf -> /usr/lib/mesa/ld.so.conf
GraphicsCard:
 Intel Corporation Mobile 4 Series Chipset Integrated Graphics Controller [8086:2a42] (rev 07) (prog-if 00 [VGA controller])
   Subsystem: Lenovo Device [17aa:20e4]
   Subsystem: Lenovo Device [17aa:20e4]
MachineType: LENOVO 7454A12
ProcEnviron:
 PATH=(custom, user)
 LANG=en_AU.UTF-8ProcKernelCmdLine: root=UUID=66c83d9d-bb68-4f51-995c-63e9b4ee025f ro quiet splash
SourcePackage: xorg
UnitySupportTest: Error: command ['/usr/lib/nux/unity_support_test', '-p', '-f'] failed with exit code -11:
UpgradeStatus: Upgraded to oneiric on 2011-07-26 (49 days ago)
dmi.bios.date: 07/30/2008
dmi.bios.vendor: LENOVO
dmi.bios.version: 6DET28WW (1.05 )
dmi.board.name: 7454A12
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:bvr6DET28WW(1.05):bd07/30/2008:svnLENOVO:pn7454A12:pvrThinkPadX200:rvnLENOVO:rn7454A12:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
dmi.product.name: 7454A12
dmi.product.version: ThinkPad X200
dmi.sys.vendor: LENOVO
version.compiz: compiz 1:0.9.5.94+bzr2803-0ubuntu1
version.ia32-libs: ia32-libs 20090808ubuntu20
version.libdrm2: libdrm2 2.4.26-1ubuntu1
version.libgl1-mesa-dri: libgl1-mesa-dri 7.11.0+git20110128.2a18d195-0ubuntu0sarvatt
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 7.11.0+git20110128.2a18d195-0ubuntu0sarvatt
version.xserver-xorg: xserver-xorg 1:7.6+7ubuntu7
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.6.0-1ubuntu13
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:6.14.99~git20110811.g93fc084-0ubuntu1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.15.901-1ubuntu2
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau N/A

Reply at: https://bugs.launchpad.net/xserver-xorg-video-
intel/+bug/849782/comments/6

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On 2011-10-12T21:38:07+00:00 Bryce Harrington wrote:

Jonathan has also tested with KMS debugging turned on, but nothing is
printed to dmesg when the glitch occurs.

I'm having him re-test natty again (to rule out hardware), as well as a
clean oneiric image (to rule out possible local config), but suspect
those won't turn up anything.

Reply at: https://bugs.launchpad.net/xserver-xorg-video-
intel/+bug/849782/comments/7

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On 2011-10-12T21:40:28+00:00 Bryce Harrington wrote:

A video to demonstrate the problem is at this link (file too large for
bugzilla):

https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-
intel/+bug/849782/+attachment/2401527/+files/VID_20110908_181612.3gp

The quality of the video is unfortunately poor, but the glitch occurs
around the 9-10 sec mark.

Reply at: https://bugs.launchpad.net/xserver-xorg-video-
intel/+bug/849782/comments/8

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On 2011-10-12T21:41:52+00:00 Bryce Harrington wrote:

Created attachment 52276
BootDmesg.txt

Reply at: https://bugs.launchpad.net/xserver-xorg-video-
intel/+bug/849782/comments/9

------------------------------------------------------------------------
On 2011-10-12T21:42:07+00:00 Bryce Harrington wrote:

Created attachment 52277
CurrentDmesg.txt

Reply at: https://bugs.launchpad.net/xserver-xorg-video-
intel/+bug/849782/comments/10

------------------------------------------------------------------------
On 2011-10-12T21:42:25+00:00 Bryce Harrington wrote:

Created attachment 52278
XorgLog.txt

Reply at: https://bugs.launchpad.net/xserver-xorg-video-
intel/+bug/849782/comments/11

------------------------------------------------------------------------
On 2011-10-12T22:00:39+00:00 Chris Wilson wrote:

Afaict from that video, the glitch was limited to a vertical shift of
the chat pane within xchat. Is the glitch typically limited to a single
window?

Reply at: https://bugs.launchpad.net/xserver-xorg-video-
intel/+bug/849782/comments/14

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On 2011-10-13T09:19:00+00:00 Jonathan Lange wrote:

It's a whole screen thing. That said, I do tend to run windows
maximized, and it *is* a momentary effect, so I could be wrong. I doubt
it though.

Sorry for the delay in answering. I had typed out an answer before and
hit "Commit", but no dice.

Reply at: https://bugs.launchpad.net/xserver-xorg-video-
intel/+bug/849782/comments/15

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On 2011-10-13T11:44:54+00:00 Chris Wilson wrote:

A whole screen jitter is much more likely to be a FIFO underrun, which
sadly are only reported with drm.debug=0x1 (along with every ioctl, so
too noisy to be useful).

Can you attach your boot dmesg with drm.debug=0xe, I want to confirm if
this hardware also fixed FIFO watermarks due to a silicon bug, in which
case there is very little we can do (if it does turn out to be a FIFO
issue).

Reply at: https://bugs.launchpad.net/xserver-xorg-video-
intel/+bug/849782/comments/16

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On 2011-10-13T13:08:27+00:00 Jonathan Lange wrote:

Created attachment 52289
dmesg with drm.debug=0xe

Attached is the dmesg with drm.debug=0xe included. I've triggered the
glitch on this boot.

Also, I've tested with clean natty and oneiric live USB sticks. I can
confirm that the issue does occur with clean oneiric and does *not*
occur with clean natty.

Reply at: https://bugs.launchpad.net/xserver-xorg-video-
intel/+bug/849782/comments/17

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On 2011-10-13T13:59:21+00:00 Chris Wilson wrote:

Ok, the important line is

[drm:g4x_update_wm], Setting FIFO watermarks - A: plane=2, cursor=2, B:
plane=26, cursor=6, SR: plane=59, cursor=6

which means that your hardware did not inherit the broken Crestline
silicon, and an actual FIFO underrun is much less likely. Might still be
worth running with drm.debug=0x1 and keeping an eye out for FIFO
underrun warnings. And as is the nature of such issues, a change in
rendering patterns is also likely to provoke running into different
memory constraints (so a FIFO underrun is susceptible to userspace
changes).

Reply at: https://bugs.launchpad.net/xserver-xorg-video-
intel/+bug/849782/comments/18

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On 2011-10-13T14:22:15+00:00 Jonathan Lange wrote:

Just to be clear, if I run with 0x1, what exactly am I grepping for in
dmesg?

Reply at: https://bugs.launchpad.net/xserver-xorg-video-
intel/+bug/849782/comments/19

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On 2011-10-13T14:30:28+00:00 Chris Wilson wrote:

if (pipe_stats[pipe] & PIPE_FIFO_UNDERRUN_STATUS)
  DRM_DEBUG_DRIVER("pipe %c underrun\n", pipe_name(pipe));

So that would be "pipe [AB] underrun"

Reply at: https://bugs.launchpad.net/xserver-xorg-video-
intel/+bug/849782/comments/20

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On 2011-10-14T11:20:46+00:00 Jonathan Lange wrote:

Created attachment 52329
dmesg w/ drm.debug=0x1

Here's w/ drm.debug=0x1. No 'pipe [AB] underrun' regex matches.

Reply at: https://bugs.launchpad.net/xserver-xorg-video-
intel/+bug/849782/comments/21

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On 2011-10-14T11:29:10+00:00 Chris Wilson wrote:

(In reply to comment #13)
> Created an attachment (id=52329) [details]
> dmesg w/ drm.debug=0x1
> 
> Here's w/ drm.debug=0x1. No 'pipe [AB] underrun' regex matches.

To check the obvious as it is quite a short dmesg (compared to what I
was expecting, very few ioctls i.e. very few drawing commands), did you
observe flicker within that time?

Reply at: https://bugs.launchpad.net/xserver-xorg-video-
intel/+bug/849782/comments/22

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On 2011-10-14T11:36:10+00:00 Jonathan Lange wrote:

(In reply to comment #14)
> (In reply to comment #13)
> > Created an attachment (id=52329) [details] [details]
> > dmesg w/ drm.debug=0x1
> > 
> > Here's w/ drm.debug=0x1. No 'pipe [AB] underrun' regex matches.
> 
> To check the obvious as it is quite a short dmesg (compared to what I was
> expecting, very few ioctls i.e. very few drawing commands), did you observe
> flicker within that time?

Yes, I did. Three separate incidents. Perhaps I mistyped the drm.debug
kernel boot option? Also, to be clear, I'm uploading /var/log/dmesg. Do
let me know if I should be doing something else.

Btw, I'm very grateful for how responsive you've been. Thanks.

Reply at: https://bugs.launchpad.net/xserver-xorg-video-
intel/+bug/849782/comments/23

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On 2011-10-14T11:52:59+00:00 Chris Wilson wrote:

Ah, iirc /var/log/dmesg is the dmesg from boot and not the latest
message. To get the current dmesg, just type 'dmesg' (so dmesg >
dmesg.txt and attach).

Reply at: https://bugs.launchpad.net/xserver-xorg-video-
intel/+bug/849782/comments/24

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On 2011-10-30T15:27:09+00:00 Jonathan Lange wrote:

Created attachment 52918
dmesg w/ drm.debug=0xe for real

This is a dmesg snapshot taken shortly after reproducing the bug with
drm.debug=0xe.

Reply at: https://bugs.launchpad.net/xserver-xorg-video-
intel/+bug/849782/comments/25

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On 2011-10-30T15:30:11+00:00 Jonathan Lange wrote:

Created attachment 52919
dmesg snapshot taken w/ drm.debug=0x1 after reproducing

This time with drm.debug=0x1.

Reply at: https://bugs.launchpad.net/xserver-xorg-video-
intel/+bug/849782/comments/26

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On 2011-11-18T15:58:21+00:00 Jonathan Lange wrote:

FWIW, this issue still occurs regularly for me.

Reply at: https://bugs.launchpad.net/xserver-xorg-video-
intel/+bug/849782/comments/29

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Title:
  Screen jitters every so often, especially when laptop under load

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