[Bug 55941] Hybrid graphics i915/radeon. Switch to radeon results to black screen

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=55941


laurent.debian at gmail.com changed:

           What    |Removed                     |Added
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                 CC|                            |laurent.debian at gmail.com




--- Comment #4 from laurent.debian at gmail.com  2013-04-06 01:55:28 ---
I have  been very puzzled when reading your last message Alex, since I got (on
debian) the exact same problem with a Mux system intel Ironlake/radeon Hd5650.
The same issue occurs with kernel 3.7.6 (compiled by me) while the switch works
correctly one the "distrib" kernel 3.2.0-4-ppae. Another issue 
appears with kernel 3.8.5 (with the NEW default modesetting bla for radeon..)
but in that case  X seems to crash (well i don't really now what's happening
only got the little  "-" on the top left of my screen)
I would be glad to give any addiotionnal infos relevant or to file a bug
myself.


(In reply to comment #3)
> You have a muxless powerxpress system so there are no displays physically
> connected to the radeon card.  The only way to utilize the radeon card is for
> offscreen rendering (radeon renders application frame and the frame is copied
> to the intel card for display).  You need the new gpu hotplug features in
> xserver 1.13.x or 1.14 to utilize the card in that manner.

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