[Bug 47351] [KMS: Mobility Radeon HD 6620G] Blank screen on boot

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=47351





--- Comment #6 from Alex Deucher <alexdeucher at gmail.com>  2013-04-29 14:20:38 ---
(In reply to comment #5)

> I have the same behaviour on my HP 4545s laptop if I try to use discrete video
> card (HD7500/7600). I managed to get it work (more or less) on integrated
> 7240G, but I get blank screen having tried to switch to discrete video. Can I
> provide any additional information to help to resolve the issue?

Most hybrid laptops are mux-less meaning there are no displays physically
connected to the discrete GPU.  For display you have to use the integrated GPU.
 The discrete GPU can only be used for offscreen rendering.  Do display that
rendering, it has to be copied to the integrated GPU.  There is limited support
for this in newer xservers (1.13.x and newer).

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