[Bug 57365] [i945GM regression] kernel 3.7-rc1 onwards. backlight on, screen dark after KMS kicks in during boot

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=57365

--- Comment #32 from Daniel Vetter <daniel at ffwll.ch> ---
We've improved the handling of the panel fitter a bit for older platforms in
3.9-rc1, so could be that the underlying race is now finally fixed.
Unfortunately those patches still have a few issues (regressions) left, so I
don't like to backport them to stable kernels for now.

Relevant patches are

commit 24a1f16de97c4cf0029d9acd04be06db32208726
Author: Mika Kuoppala <mika.kuoppala at linux.intel.com>
Date:   Fri Feb 8 16:35:37 2013 +0200

    drm/i915: disable shared panel fitter for pipe

and

commit 9d6d9f19e8146fa24903cb561e204a22232740e3
Author: Mika Kuoppala <mika.kuoppala at linux.intel.com>
Date:   Fri Feb 8 16:35:38 2013 +0200

    drm/i915: clean up panel fitter handling in lvds

If those two indeed fix things for you, we could backport them once the
regression they introduce is tackled.

If those aren't the fixes, a reverse bisect to hunt for the first good commit
would be interesting.

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