[Bug 69301] no screen on update from 3.12.0

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=69301

Jakob Kummerow <jakob.kummerow at gmail.com> changed:

           What    |Removed                     |Added
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                 CC|                            |jakob.kummerow at gmail.com

--- Comment #8 from Jakob Kummerow <jakob.kummerow at gmail.com> ---
I'm having a similar problem: with 3.13.0, X fails to start, freezes with a
blank screen instead (text mode works fine, though). Adding radeon.dpm=0 to the
kernel command line helps. Reverting the commit mentioned in #6 does not help.
Everything worked fine with 3.12.* and earlier. 
This is on a Radeon HD 6850, xf86-video-ati 7.2, mesa 9.2.5, libdrm 2.4.52,
with two monitors: one is in use, the other (a TV, connected by DVI-to-HDMI
cable) is usually powered off, which doesn't prevent the card from detecting
its presence and reading its EDID data.

I can try to bisect this, but won't have time before the weekend.

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