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Bug 142046 - XEN Graphical bugs and application instability in Xen domain 0 on Thinkpad T21.
XEN Graphical bugs and application instability in Xen domain 0 on Thinkpad T21.
Product: Fedora
Classification: Fedora
Component: kernel (Show other bugs)
i686 Linux
medium Severity medium
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Assigned To: Rik van Riel
Brian Brock
Depends On:
Blocks: 179599
  Show dependency treegraph
Reported: 2004-12-06 16:56 EST by Alexander Boström
Modified: 2007-11-30 17:10 EST (History)
1 user (show)

See Also:
Fixed In Version:
Doc Type: Bug Fix
Doc Text:
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Clone Of:
Last Closed: 2006-02-08 21:17:35 EST
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RHEL 7.3 requirements from Atomic Host:
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Description Alexander Boström 2004-12-06 16:56:42 EST
(Don't know if kernel is the right component...)

Description of problem:
When using Xen on my IBM Thinkpad T21 (S3 Savage/IX-MV graphics),
several programs have problems with their X11 GUIs and crash very
often. Using kernel-2.6.9-1.1018_FC4xen0. The problem goes away if I
switch to kernel-2.6.9-1.1018_FC4. (Yes, tls is disabled.)

Symptoms: Metacity titlebar sometimes becomes only a few pixels high,
Firefox display big single-coloured rectangles on top of the text,
Evolution fails to display the text in the message list. These apps
also crash very often.

How reproducible:

Steps to Reproduce:
1. Install and update FC3.
2. Install Xen from http://people.redhat.com/riel/
3. mv /lib/tls{,.disabled}, edit grub.conf etc...
4. reboot and log in to X
Comment 1 Rik van Riel 2004-12-06 19:33:33 EST
Does this bug happen if you add the following to the Device section of
your xorg.conf ?

Option      "NoAccel" "yes"
Comment 2 Alexander Boström 2004-12-07 08:52:16 EST
Yes, it does.
Comment 3 Rik van Riel 2004-12-07 09:05:20 EST
OK, added to my list of things to look at.  I will try to finish the
basic packaging of Xen first though, before diving head-first into
fixing up Xen internals.

In the mean time, we can try some workarounds. One thing you can try is:

Option "BusType" "PCI"
Comment 4 Alexander Boström 2004-12-07 09:39:50 EST
> before diving head-first into fixing up Xen internals.

Yes, of course. :-)

> Option "BusType" "PCI"

No, still no change, neither alone nor in combination with NoAccel,
even after a reboot.
Comment 5 Alexander Boström 2004-12-07 10:03:34 EST
Upgraded to 2.6.9-1.1020_FC4xen0. Didn't help.
Comment 6 Rik van Riel 2005-02-01 21:45:38 EST
The xen agpgart patch is in kernel 2.6.10-1.1120_FC4.  That patch may
well fix (part of) your X problems.
Comment 7 Alexander Boström 2005-02-05 09:20:34 EST
Hmm, now agpgart won't initialize. I filed bug #147258.
Comment 8 Rik van Riel 2005-03-07 17:10:53 EST
There was an FPU context saving bug in the patch I created here to have xen
compile with the 2.6.11-rc kernel in rawhide.  That bug is fixed in  kernel

I still don't have 3D applications running here (at least not bzflag), but the
normal graphical instability here seems to have gone away.  Could you please
verify whether kernel 2.6.11-1.1176_FC4 still has this bug?
Comment 9 Alexander Boström 2005-03-13 15:53:45 EST
Sorry, I still can't get X to work at all in Xen0. I'm using
2.6.11-1.1177_FC4xen0. (bug #147258)
Comment 10 Rik van Riel 2006-02-08 21:17:35 EST
Should be fixed in current Fedora Core 5 rawhide Xen packages.

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