[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

Daniel Vetter <daniel at ffwll.ch> changed:

           What    |Removed                     |Added
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             Status|NEW                         |NEEDINFO

--- Comment #24 from Daniel Vetter <daniel at ffwll.ch> ---
Thomas, sorry for the long delay in answering. I've just looked at the reg
dumps, but unfortunately nothing important is different :( We do know of random
lvds issues in general, so there's probably still something broken in our code
somewhere. And big timing changes while booting break it or fix it again.

The only indication is the pipe B underrun thus far.

Another thing to try is whether subsequent modesets fix things again, i.e. in X
enable/disable the lvds output a few times. Easiest way to do it is to connect
a 2nd screen ...

To everyone else: Since there are tons of different ways to end up with a black
screen, please file your own bug reports about your issues - if we intermingle
different bugs in the same bug report we'll quickly loose track of things.

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