[Bug 16376] random - possibly Radeon DRM KMS related - freezes

[bugzilla-daemon@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=16376





--- Comment #3 from Martin Steigerwald <Martin@Lichtvoll.de>  2010-07-13 10:24:05 ---
I did some research on the internet and found this possibly related case - hot,
since it also happens on a ThinkPad T42 with similar if not same graphics
hardware:

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Random freezes with kernel 2.6.34 and xorg 1.8

The other day I upgraded the kernel to version 2.6.34 and at the same time
xorg-server to 1.8 (along with input drivers and video drivers). From that
moment, I suffer from random freezes, the system is completely locked up; the
screen doesn't blank, though. The system appears to be perfectly fine, but
after some minutes it will freeze.

As far as I can remember, the freezes only occur when using a webbrowser.
Chromium is my default browser, but also Firefox and Konqueror caused the
system to freeze completely when I want to open a webpage. Other network
programs such as irssi can run for hours and they didn't seem to cause any
havoc.

At first I thought this might be caused by some instability in the latest
xf86-video-ati driver, so I downgraded back to xorg-server 1.7. Still the same
symptoms, so I am pretty sure now there's something in the kernel. So I went
back to xorg-server 1.8 and downgraded the kernel to 2.6.33. So far, the system
hasn't let me down, yet. Also, I uninstalled the madwifi packages on my system
so I'm using the ath5 drivers shipped with the kernel. That change doesn't seem
to make a difference.

I am not exactly sure what exactly could cause this, there's no trace in any
log file to be found. My suspicion is that it's network related.

The hardware is a Thinkpad T42 with an ATI Radeon Mobility 9600 (r300) chip and
an Atheros wireless card.

Anyone else with similar experiences with this hardware? I can't think of a way
how to properly debug this. I know I can bisect, but that's time consuming and
perhaps it's quicker to ask around first before I walk down that road. Any
suggestions are welcome on how to track this down
------------------------------------------------------
http://bbs.archlinux.org/viewtopic.php?pid=789948

I do not use any wireless however, the ipw2200 radio is disabled here.


Unlikely cause it seems to be easily reproducable:

------------------------------------------------------
seems to freeze on drm installation [2.6.34, 2× RV280]

See attached screenshot. While I can boot anything up to 2.6.33,
2.6.34 seems to reproducibly hang itself up when it starts DRM. This
machine has two Radeon RV280 cards.
------------------------------------------------------
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=586137

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