http://bugzilla.kernel.org/show_bug.cgi?id=14997
Takashi Iwai <ti...@suse.de> changed:
What |Removed |Added
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CC| |ti...@suse.de
--- Comment #12 from Takashi Iwai <ti...@suse.de> 2010-02-12 15:12:00 ---
I took a bit more at this problem, too, for the same machine Matthias is
checking (945GM). The problem looks like that the encoder->crtc is cleared at
lid close, but it's never recovered properly.
Namely, drm_crtc_helper_set_config() is called by intel's set_config, and this
calls drm_helper_disable_unused_functions() that prunes off crtcs used for
LVDs. Then, at lid open, drm_helper_resume_force_mode() is called, but this
resumes the CRTCs that are already enabled, thus it doesn't help for resuming
LVDS.
The ad-hoc patch below fixes this issue. I'm not 100% sure whether this is
really correct. Hopefully this will help for a better fix.
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