[Bug 53926] [945gm regression] LVDS boots to blank screen

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=53926

--- Comment #48 from Nathan Schulte <nmschulte at gmail.com> ---
Some updates:

First, I built the mainline kernel last night (a few commits before 3.8-rc8),
and the problem appears to have been fixed.

Next, I built vanilla 3.2 and ensured that the problem still existed; it did. 
I then proceeded to slim down my .config to speed up the build, and attempted
to bisect the issue, noting that "good" was really bad, and "bad" was actually
good.

A few of the chosen bisection points would cause kernel panics from DRM/i915,
so I skipped these.  At some point, much before the vanilla that the Debian 3.7
kernel is built upon, the issue appears to have been fixed.  How can that be? 
Could there be multiple regressions causing and subsequently fixing this issue
throughout the history?

Here is a history of bisection before I gave up, note that "good" is really
bad, and "bad" is really good.

COMMIT [COMMIT_DATE] GIT_BISECT_STATUS - OTHER_DETAILS

805a6af [2012-01-04 175544] good - start; issue apparent
c558386 [2012-07-02 042322] good - 1st;   issue apparent
7f60ba3 [2012-10-07 033050] skip - 2nd;   issue not apparent; kernel panic
9ff601a [2012-06-28 090327] good - 3rd;   issue apparent
327967c [2012-09-04 090336] skip - 4th;   issue not apparent
3077494 [2012-09-21 094309] skip - 5th;   issue not apparent; kernel panic
5cbe786 [2012-08-16 081314] bad  - 6th;   issue not apparent
974b335 [2013-01-08 205356] bad  - stop;  issue not apparent

--

If we can safely ignore the kernel panics, the issue was last seen in commit
9ff601a (June 28, 2012) and is first seen fixed in commit 7f60ba3.  I will try
bisecting those two commits and see what I find.

The data from the bisect doesn't jive with the kernel from Debian, though.  I
don't know what to make of that, honestly.  Any ideas?

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