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

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Message-ID: <aG2IL07UtZ4YICMn@intel.com>
Date: Tue, 8 Jul 2025 17:05:51 -0400
From: Rodrigo Vivi <rodrigo.vivi@...el.com>
To: Werner Sembach <wse@...edocomputers.com>
CC: Jani Nikula <jani.nikula@...ux.intel.com>, Joonas Lahtinen
	<joonas.lahtinen@...ux.intel.com>, Tvrtko Ursulin <tursulin@...ulin.net>,
	David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
	<intel-gfx@...ts.freedesktop.org>, <intel-xe@...ts.freedesktop.org>,
	<dri-devel@...ts.freedesktop.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH 0/1] drm/i915/display: Avoid unsupported 300Hz output
 mode on a TUXEDO device

On Fri, Jul 04, 2025 at 09:03:45PM +0200, Werner Sembach wrote:
> RFC because I'm not sure if this is the right approach.

Could you please file a gitlab issue for us so we can get someone from our
display team to take a look and see if there's anything else that could be done
before we take the quirk route?

https://drm.pages.freedesktop.org/intel-docs/how-to-file-i915-bugs.html

Thanks for the investigation and the quirk,
Rodrigo.

> 
> 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
>