[Bug 54662] [bisected] Kernel 3.6 breaks KMS on Radeon RV530 (black screen)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=54662

--- Comment #4 from Simon Kitching <skitching at apache.org> 2012-09-09 13:43:26 UTC ---
(In reply to comment #1)
> Can you attach the dmesg output from the non-working case?

Hi Alex,

Thanks very much for your suggestions. 

I'm not sure how to obtain dmesg output, given that I can't get a console in
the failing case. The normal login screen is black, ctrl-alt-f2 doesn't work.
Unfortunately I don't have another machine available to try to SSH to this
laptop. Booting with "nomodeset" works, but then dmesg isn't very useful.

Recent Ubuntu versions don't come with an xorg.conf file, and "sudo Xorg
-configure" reports a fatal error, so I'm not sure how to generate a base file
to tweak.

I could attach /var/log/Xorg.0.log.old after rebooting from the failed state to
something saner, if this would be useful.

However patch "https://bugs.freedesktop.org/attachment.cgi?id=66876" attached
to bug #54129 appears to fix this bug too, so the above are probably moot.

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