[Bug 36003] [Radeon HD 5650 and 5470] Driver crash during recovery boot and in normal boot (Regression from 2.6.38-3 to -4)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=36003

--- Comment #9 from Bryce Harrington <bryce at canonical.com> 2011-04-07 18:52:59 PDT ---
Response from the original reporter:

Bryce Harrington wrote in #25 "Upstream would like to see if setting the video
to the radeon/descrete setting in the BIOS configuration makes it function
properly."

Answer: Yes it does. I tried that a while ago already, but can't (don't want
to) use that for regular running, because the radeon-card makes the
laptop-battery ruin out too fast. I read also that there's a patched/hacked
BIOS somewhere that allows to switch off the radeon-card via BIOS, but if it
can be solved with software I'd prefer that ;)



Chris Halse Rogers wrote in #22: "This does look a lot like some bad
interaction between i915/radeon"

I agree - I did some more testing and placed an entry for the radeon-module
into /etc/initramfs-tools/modules, and voilá - no crash! (after booting into X
I can't get back to the text-console, but that's possibly another issue).

What proves the "bad interaction" even more is: when also placing "i915" into
/etc/initramfs-tools/modules BEFORE "radeon", booting isn't possible at all any
more, but when placing i915 AFTER radeon, booting is possible, but I got a
black screen (as in totally black, that is: no backlight) until X starts up.

I'll try to get logs of four different initrd-configurations (though I doubt
I'll be able to record the one where the crash occurs already during running of
initrd...)

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