X (XFree86 4.3.0-55) crashes under load on my Thinkpad T41 (2378DHU) which has a Radeon mobility 7500 display (1024x768). But only after a suspend and resume. I am using a fully updated Fedora Core 1 stock kernel 2.4.22-1.2174.nptl, with APM. (It was present too on the earlier kernel and XFree86 versions from Fedora). Suspension and resume appear to work fine, but leave this instability.
The problem is subtle. Initially I just experienced a very occasional crash, which brought down the whole machine (as well as keyboard and mouse). Annoying. But I recently found certain graphics-intensive applications that would routinely crash the machine within a few minutes (but seemingly not always at exactly the same time). In some cases I have been able to ssh into the machine from the network and run top. It shows X using over 90\% of the cycles. If X is forcibly killed (kill -9) the whole machine crashes and one needs the power switch. No crash has occurred unless the computer has been suspended and resumed. After a suspend resume (or hibernate resume) it happens within minutes for these (totally different) applications.
I have done extensive testing to prove that this is the core XFree86 code. It still occurs if all modules except type1 and truetype fonts are turned off in the XF86Config, proving that it is not the DRI, and glx etc, module extensions. I have removed all sorts of additional kernel modules from my system to eliminate their effect.
I have demonstrated that it does not happen if one restarts the X server (by ctrl-alt-backspace) after a suspend resume.
Moreover, I have demonstrated that it only happens in depth 24 display, I have never seen it in depth 16. (But why would I want always to run 16 depth on this display? Also it might just be that on the depth 16 display my tests just don't thrash the server hard enough.) I have also not been able to crash the system even in 24 depth when using the Option ``NoAccel'' ``true'' (suggested by Volker Braun).
I have furthermore discovered that the demo version of XIG's Summit AcceleratedX server does not crash. That might cause me to buy it in preference to XFree86, even though I don't seem to be able to get both the touchpad and the stick working simultaneously with AcceleratedX.
I have tested my memory with the memtest86 program, in case the problem was hardware. That test reveals no errors with my 256M IBM-supplied memory. I have moved the irqs around in the BIOS so that the video moves to a different irq. No difference.
QUESTION: has anyone got information on this bug, especially how it can be fixed? I have spent a lot of time on it, and I expect it is not unique to me, but I can't find any reports of this particular problem on the net.
Insights and experience would be greatly appreciated.
I am posting my log and config files, for the cognoscenti at
\url{http://silas.psfc.mit.edu/XFree86.0.log},\url{http://silas.psfc.mit.edu/XF86Config}
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