[Bug 488328] Re: screen brightness won't come back when I open the lid

Kai Jauch bugs at kaijauch.de
Fri Feb 12 18:05:59 UTC 2010

This should be interesting:

"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

There is also a patch attached which, according to Takashi Iwai, fixes
the problem. I don't know whether this is also the case for the GM45.

** This bug is no longer a duplicate of bug 505271
   [gm45] "*ERROR* Execbuf while wedged" when closing laptop lid with compiz running

** Bug watch added: Linux Kernel Bug Tracker #14997

screen brightness won't come back when I open the lid
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