linux-kernel - [RFC PATCH 0/1] drm/i915/display: Avoid unsupported 300Hz output mode on a TUXEDO device

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Message-ID: <20250704192007.526044-1-wse@tuxedocomputers.com>
Date: Fri,  4 Jul 2025 21:03:45 +0200
From: Werner Sembach <wse@...edocomputers.com>
To: Jani Nikula <jani.nikula@...ux.intel.com>,
	Rodrigo Vivi <rodrigo.vivi@...el.com>,
	Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
	Tvrtko Ursulin <tursulin@...ulin.net>,
	David Airlie <airlied@...il.com>,
	Simona Vetter <simona@...ll.ch>
Cc: Werner Sembach <wse@...edocomputers.com>,
	intel-gfx@...ts.freedesktop.org,
	intel-xe@...ts.freedesktop.org,
	dri-devel@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org
Subject: [RFC PATCH 0/1] drm/i915/display: Avoid unsupported 300Hz output mode on a TUXEDO device

RFC because I'm not sure if this is the right approach.

The flicker manifests ever few seconds 1-3 black frames in quick
succession.

On windows 300Hz can not be selected for the iGPU, but the panel advertises
it.

A cleaner solution would probably to go over the pixel clock, but for this
device there is only one 300Hz mode in the panels edid and that is at the
nativ resolution. Chroma subsampling was not tested as linux afaik offers
no way to easily enforce it for intel gpus.

Tim Guttzeit (1):
  drm/i915/display: Avoid unsupported output mode with 300Hz on TUXEDO
    device

 drivers/gpu/drm/i915/display/intel_dp.c     |  5 ++++
 drivers/gpu/drm/i915/display/intel_quirks.c | 30 +++++++++++++++++++++
 drivers/gpu/drm/i915/display/intel_quirks.h |  1 +
 3 files changed, 36 insertions(+)

-- 
2.43.0