[PATCH 0/5][SRU][F][OEM-OSP1-B] Intel Gen 9 brightness cannot be controlled
AceLan Kao
acelan.kao at canonical.com
Wed Mar 4 06:00:45 UTC 2020
BugLink: https://bugs.launchpad.net/bugs/1861521
[Impact]
After Ubuntu-5.4.0-9.12 which introduce DPCD backlight patches, the
backlight control on some platforms fail to work.
It seems using OUI string to map the panels which support DPCD
backlight doesn't work well, it mis-mapped those panel that doesn't
support DPCD backlight, and breaks the backlight control.
[Fix]
The author of the origin DPCD backlight patches recently provides a
DP quirks based on EDID identification.
[Fix]
Verified on the machine with DPCD backlight and also on the machine
which has regression with the OUI quirks, both of them work now.
[Regression Potential]
Low, it introduce a new quirks to list the panels which support DPCD
backlight.
AceLan Kao (2):
Revert "USUNTU: SAUCE: drm/i915: Force DPCD backlight mode on Dell
Precision 4K sku"
Revert "UBUNTU: SAUCE: drm/i915: Force DPCD backlight mode on X1
Extreme 2nd Gen 4K AMOLED panel"
Lyude Paul (3):
drm/dp: Introduce EDID-based quirks
drm/i915: Force DPCD backlight mode on X1 Extreme 2nd Gen 4K AMOLED
panel
drm/i915: Force DPCD backlight mode for some Dell CML 2020 panels
drivers/gpu/drm/drm_dp_helper.c | 84 +++++++++++++++++--
.../drm/i915/display/intel_display_types.h | 1 +
drivers/gpu/drm/i915/display/intel_dp.c | 11 ++-
.../drm/i915/display/intel_dp_aux_backlight.c | 31 ++++---
drivers/gpu/drm/i915/display/intel_dp_mst.c | 2 +-
drivers/gpu/drm/i915/display/intel_psr.c | 2 +-
include/drm/drm_dp_helper.h | 21 +++--
7 files changed, 124 insertions(+), 28 deletions(-)
--
2.17.1
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