APPLIED[F/H]/CMT: [PATCH 0/1][SRU][F][G][H][OEM-5.10] XPS 9510 (TGL) Screen
kelsey.skunberg at canonical.com
Fri Aug 6 21:16:51 UTC 2021
Applied to Focal and Hirsute master-next. Focal's patch required context
changes to be applied since edid_quirk_list was since changed. The added
line itself was not altered.
On 2021-06-25 10:13:25 , AceLan Kao wrote:
> From: "Chia-Lin Kao (AceLan)" <acelan.kao at canonical.com>
> BugLink: https://bugs.launchpad.net/bugs/1933566
> Dell XPS 15 9510(TGL) uses DPCD to control backlight, and need to add this
> panel to edid_quirk.
> kernel: [ 1.719773] i915 0000:00:02.0: [drm] Panel advertises DPCD
> backlight support, but VBT disagrees. If your backlight controls don't work
> try booting with i915.enable_dpcd_backlight=1. If your machine needs this,
> please file a _new_ bug report on drm/i915, see
> https://gitlab.freedesktop.org/drm/intel/-/wikis/How-to-file-i915-bugs for
> Kernel 5.12+ support the backlight via:
> commit: <4a8d79901d5b> ("drm/i915/dp: Enable Intel's HDR backlight
> interface (only SDR for now)"), and doesn't need this quirk.
> Adding the panel's MFG to edid_quirk makes system switch to use DPCD to
> control backlight.
> Verified on Dell XPS 9510(TGL)
> [Where problems could occur]
> The quirk is for a dedicate panel, and won't affect other platforms.
> Chia-Lin Kao (AceLan) (1):
> UBUNTU: SAUCE: drm/i915: Force DPCD backlight mode for Dell XPS
> drivers/gpu/drm/drm_dp_helper.c | 1 +
> 1 file changed, 1 insertion(+)
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