Maurice Codik, this bug was reported a while ago and there hasn't been
any activity in it recently. We were wondering if this is still an
issue? If so, could you please test for this with the latest development
release of Ubuntu? ISO images are available from
http://cdimage.ubuntu.com/daily-live/current/ .

If it remains an issue, could you please run the following command in
the development release from a Terminal
(Applications->Accessories->Terminal), as it will automatically gather
and attach updated debug information to this report:

apport-collect -p xorg-server REPLACE-WITH-BUG-NUMBER

Please note, given that the information from the prior release is
already available, doing this on a release prior to the development one
would not be helpful.

Thank you for your understanding.

Helpful bug reporting tips:
https://wiki.ubuntu.com/ReportingBugs

** Changed in: xorg-server (Ubuntu)
   Importance: Undecided => Low

** Changed in: xorg-server (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/892677

Title:
  X server freeze

Status in “xorg-server” package in Ubuntu:
  Incomplete

Bug description:
  I'm getting X freezes that matches the description of the problem
  listed here: https://wiki.ubuntu.com/X/Troubleshooting/Freeze on a new
  ubuntu 11.10 install on a Thinkpad T60. The freeze has happened on
  several occasions: a few times while on wifi with libreoffice and
  firefox open, other times when the laptop was idle with only firefox
  running on ethernet.

  dmesg says:

  [ 4824.350997] NMI: PCI system error (SERR) for reason a1 on CPU 0.
  [ 4824.351003] Dazed and confused, but trying to continue
  [ 6277.219752] BUG: unable to handle kernel NULL pointer dereference at   
(null)
  [ 6277.219760] IP: [<f82278ee>] radeon_read_ring_rptr+0x1e/0x30 [radeon]

  Xorg.0.log says:

  [  4836.859] [mi] EQ overflowing. The server is probably stuck in an
  infinite loop.

  dmesg, lspci and Xorg.0.log attached.

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