radeontool in Jaunty alpha-3* can be used to assist in debugging this issue.
After installing it, you run it like this:
radeontool regmatch '*' > regdump_good.txt
radeontool regmatch '*' > regdump_broke.txt
Run it two times. Once when you have a working screen (for any driver),
and once in the broken case (either from the tty console or logged into
the sick box remotely). Attach both of those to this bug report, and we
can then forward this issue upstream. Thanks ahead of time!
[* Note: radeontool is available in earlier versions of Ubuntu but is
too old; if you need to run it on an older version of Ubuntu, you can
obtain and build it from the upstream git tree at
http://cgit.freedesktop.org/~airlied/radeontool/. Or maybe just try
copying the executable from the jaunty system to the older one; I've not
tried it but it might work.]
** Changed in: xserver-xorg-video-ati (Ubuntu)
Status: Triaged => Incomplete
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X fails to start - black screen and freeze on 8.10 Intrepid final with ATI R360
9800XT AGP
https://bugs.launchpad.net/bugs/292868
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