drm/i915: don't change DRM configuration when releasing load detect pipe
From: Jesse Barnes <firstname.lastname@example.org>
When we get a CRTC to use for load detection, we restore its DPMS state
if needed. We shouldn't, however, change the DRM configuration by
calling drm_helper_disable_unused_functions when we release the CRTC.
Doing so can cause problems with resume, since at suspend or lid close
time, X may choose to probe outputs. If it doesn't re-probe them at
open or resume time, LVDS won't be restored, since
drm_helper_disable_unused_functions will have turned it off, preventing
the mode set at lid open from restoring it.
Fixes kernel bz #14997.
Cc: stable at kernel.org
Tested-by: Takashi Iwai <tiwai at suse.de>
Tested-by: Thorsten Leemhuis <fedora at leemhuis.info>
Signed-off-by: Jesse Barnes <jbarnes at virtuousgeek.org>
Signed-off-by: Chase Douglas <email@example.com>
drivers/gpu/drm/i915/intel_display.c | 2 --
1 files changed, 0 insertions(+), 2 deletions(-)