[Bug 67454] After suspend/resume, screen is black for all but the highest levels with i915 driver on MacBook Air 6,2
bugzilla-daemon at freedesktop.org
bugzilla-daemon at freedesktop.org
Tue Jan 14 10:03:13 PST 2014
https://bugs.freedesktop.org/show_bug.cgi?id=67454
--- Comment #85 from sam.attwell at gmail.com <sam.attwell at gmail.com> ---
(In reply to comment #81)
> (In reply to comment #79)
> > Thank you Patrick! Good work - your module works great on my Macbook Air
> > 6.2 in EFI-Mode. (Kernel 3.13-rc3). I'd love to understand the actual
> > problem, did you figure out, why the standard backlight mechanism in i915
> > doesn't work?
>
> I still don't understand what the actual problem is but the backlight driver
> (LP8550) that my module is controlling doesn't change any of it's settings
> after suspend. It takes a PWM signal on one of the input pins and that
> signal must be getting screwed up. How that pin is wired might be harder to
> figure out.
>
> What my module does is to ignore that input pin and instead write the
> brightness value to an on-chip register and set it up so it becomes the
> source for the LP8550. I access the LP8550 over SMBUS through ACPI methods.
> It might be better to access the SMBUS directly but this was the fastest way
> to get something working.
>
> If you find any bugs/issues with mba6x_bl please report it on github.
Hi Patrick,
Trying to make install from the git repository fails for me with:
"Can't read private key
DEPMOD 3.11.0-15-generic
make[1]: Leaving directory `/usr/src/linux-headers-3.11.0-15-generic'"
Anything obvious i'm doing wrong?
--
You are receiving this mail because:
You are the QA Contact for the bug.
You are the assignee for the bug.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.freedesktop.org/archives/intel-gfx-bugs/attachments/20140114/a5e151cd/attachment.html>
More information about the intel-gfx-bugs
mailing list