[RFC,0/1] Remove DPCD Aux Backlight Control PWM_PIN check

Message

Satadru Pramanik Sept. 23, 2020, 10:13 p.m. UTC

The Google Pixel Slate/Nocturne device uses a DPCD backlight
which requires Aux Backlight Control to be enabled. This is 
enabled in the ChromeOS kernel trees via disabling the PWM_PIN
check and also an extended heuristic, which was upstreamed 
in 2017, but reverted shortly thereafter due to a regression
on a Thinkpad X1 Carbon 4th Gen as per
https://bugs.freedesktop.org/show_bug.cgi?id=101619

I'm hoping that there is a way to remove that check and not
cause problems for other machines, as otherwise the backlight
is nonfunctional for nocturne, (and possibly for other related
machines such as the eve Pixelbook as well.)

Satadru Pramanik (1):
  Remove DPCD Aux Backlight Control PWM_PIN check

 drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)