[Bug 30052] Fails to start X with intel+Ati video, whith modeset=1

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=30052





--- Comment #18 from Seth Forshee <seth.forshee at canonical.com>  2011-08-31 14:16:18 ---
I just completed a bisection with some of the reporters to identify what fixed
this, and it came down to this commit:

  commit 3448a19da479b6bd1e28e2a2be9fa16c6a6feb39
  Author: Dave Airlie <airlied at redhat.com>
  Date:   Tue Jun 1 15:32:24 2010 +1000

  vgaarb: use bridges to control VGA routing where possible.

I can't see why this would have any impact on whether or not the GPU is powered
on when nouveau probes it. Is there any explanation for why this appears to fix
the issue, or is it likely that it's just changing the timing enough to somehow
mask it?

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