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: <881d51a5-bed3-430e-a3cd-aca5f17e16bf@tuxedocomputers.com>
Date: Wed, 9 Jul 2025 15:32:35 +0200
From: Tim Guttzeit <t.guttzeit@...edocomputers.com>
To: Werner Sembach <wse@...edocomputers.com>,
 Rodrigo Vivi <rodrigo.vivi@...el.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

Hi all,

 > Tim can you follow up with this? Reducing the communication chain to 
avoid dropping information.

Yes, here is the Ticket: 
https://gitlab.freedesktop.org/drm/i915/kernel/-/issues/14616

Best regards,
Tim Guttzeit

Am 09.07.25 um 13:49 schrieb Werner Sembach:
> Hi all,
>
> Am 08.07.25 um 23:05 schrieb Rodrigo Vivi:
>> 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
>
> Tim can you follow up with this? Reducing the communication chain to 
> avoid dropping information.
>
> Best regards,
>
> Werner Sembach
>
>>
>> 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
>>>