http://bugzilla.kernel.org/show_bug.cgi?id=14997





--- Comment #20 from Takashi Iwai <ti...@suse.de>  2010-02-13 19:32:25 ---
(In reply to comment #19)
> (In reply to comment #15 from Takashi)
> > To be noted, the blank screen problem appears only with X.  On framebuffer, 
> > it
> > works after lid open.
> Same here. *But* the backlight isn't disabled on framebuffer at all afaics 
> when
> the lid is closed :-/ When opening the lid the screen goes dark for half a
> second or so and then is back properly.

Hm, I didn't check it properly.  Will check on Monday.

> (In reply to comment #18 from Jesse)
> > So I'm still confused about what's going on here. 
> Can I provide anything to help finding the root cause without a whole
> bisection, as doing one afaics would take quite a while...

Could you set debug=6 option for drm module and take the kernel logs at lid
close and open before that?

Of course, you can try some patches floating around here (e.g. the one in
comment 13 or in comment 14).  If the comment 13 works, it's the identical
problem.  So far, it's not 100% clear whether we all see the same problem.

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