[i965gm] Compiz sometimes freezes X

Thank you for the bug report. In regards to ssh, when you get the freeze, can you ssh into it via an Ethernet cable?

I'd also suggest making sure you are up-to-date with the latest Beta packages by running 'sudo update-manager -d', as I noticed your kernel was downlevel by a few versions at #38.

appears that the bug is in the xorg stack, not compiz per se

I've cataloged all -intel freezes currently open against jaunty, in this table:

  https://wiki.ubuntu.com/X/Bugs/IntelDriver

From this data, it appears there was a regression in the i965 code recently. It is not clear to me if it is due to a problem in the kernel, in -intel, or somewhere else...

I upgraded my i965 today (last upgraded a couple weeks ago, and has not had freezes) and within a couple hours was able to get "the freeze".

After analyzing all the changes that came with my upload, I identified the mesa 7.3 -> 7.4 upgrade as the most likely culprit. Indeed, after reverting this, I've had no freezes for >24 hrs.

I would be interested in hearing your experience with downgrading mesa to 7.3.

After running 7.3 for some time I found I still have freezes. Over 5 days I had 2 freezes with 7.3. After switching back to 7.4 I had 3 freezes in a period of 12 hours. In all cases, the freezes came when I was using the machine (i.e., not when idle).

Stuart, are you still seeing the freezes? What frequency do you see them? What version of mesa do you have installed? If you disabled compiz, does that make the freezes go away, or have you still experienced any?

Another suggestion is to add this to your Device section in xorg.conf:

  Option "EXAOptimizeMigration" "off"

Purportedly, this may help improve performance too, but we need further testing to verify that.

I have since upgraded to the latest Jaunty packages (as requested above), and, so far (touch wood) I have not had a freeze at all. I shall update this bug if I get any!

We have a PPA with some new tools for debugging X freezes:

  https://launchpad.net/~ubuntu-x-swat/+archive/x-freeze-test

I know how irritating X freezes can be. They're also typically
quite hard to debug, but the information provided by these new
tools should help upstream figure them out.

You can help by doing the following:

 A. Install the PPA packages on Jaunty and boot kernel 2.6.30-rc2
 B. Reproduce your freeze
 C. ssh into the machine and run the steps to collect the info
 D. Attach the tarball of the results to this bug report

With this information, we'll be able to forward your bug upstream.

(For more information on triaging X freeze bugs, see
 https://wiki.ubuntu.com/X/Troubleshooting/Freeze )

I think I got this problem. I had a complete lock up and wasn't sure what to do so I hardbooted but now I can't even get to recovery mode. Is there any way I can get back on to retrive crash data? (and get my system going again)

I got my system back up. Apport didn't even come up with anything so I'm not sure what went on.

And more often okular and dolphin doesn't refresh correctly "video data", when changing application view with alt+tab
---
ii okular 4:4.2.2-0ubunt document viewer for KDE 4
---
ii dolphin 4:4.2.2-0ubunt file manager for KDE 4
---
many black or white windows are shown instead correct data.

Please test the package in this PPA, which has a fix for X freeze issues like this one.

  https://edge.launchpad.net/~bryceharrington/+archive/green/

We're closing this bug since it is has been some time with no response from the original reporter. However, if the issue still exists please feel free to reopen with the requested information. Also, if you could, please test against the latest development version of Ubuntu, since this confirms the bug is one we may be able to pass upstream for help.

And with new kernel release, also scrolling mouse doesn't refresh correctly "video data":

uname -a
Linux Kubuntu904 2.6.28-14-generic #46-Ubuntu SMP Wed Jul 8 07:21:34 UTC 2009 i686 GNU/Linux

adjusting from "In Progress" as Andy is no longer assigned.

~JFo

This works fine nowadays, and Ubuntu 9.04 itself is end-of-lined. Ubuntu 10.04 LTS for example is solid with the same hardware.