[Nouveau] [Bug 39550] [NV96] Brightness stuck to low value after suspend/resume on HP Elitebook 8530w

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=39550

Roy <r.spliet at student.tudelft.nl> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |NEEDINFO
           Assignee|nouveau at lists.freedesktop.o |r.spliet at student.tudelft.nl
                   |rg                          |
  Attachment #85010|0                           |1
        is obsolete|                            |

--- Comment #46 from Roy <r.spliet at student.tudelft.nl> ---
Created attachment 85012
  --> https://bugs.freedesktop.org/attachment.cgi?id=85012&action=edit
drm/nv50: Fix backlight not working when PWM_DIV is uninitialised (v2)

V2 fixes the reach of this patch.
>From what I can tell the PWM_DIV is simply a divider for the initial PWM clock
or something, it does not affect the scope of the duty cycle. I therefore
assume 0x5e is always a good value to set. Traces from NV50:NVA0 would help
verify whether NVIDIA always sets this value or not.
This patch requires acpi_backlight=vendor to be set because it tests for the
presence of a backlight by testing drm->backlight. An alternative to this test
would be checking for the GPIO to be present and routed to SOR, but I wouldn't
be surprised if there is at least one device that expects our driver to route
it manually. How should we go about this?

-- 
You are receiving this mail because:
You are the assignee for the bug.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.freedesktop.org/archives/nouveau/attachments/20130901/9e4faef5/attachment-0001.html>