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: <95fd3ab0-7fe9-4abe-a57d-bf261064c097@tuxedocomputers.com>
Date: Tue, 15 Jul 2025 17:45:53 +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, intel-gfx@...ts.freedesktop.org,
 intel-xe@...ts.freedesktop.org
Subject: Re: [RFC PATCH 0/1] drm/i915/display: Avoid unsupported 300Hz output
 mode on a TUXEDO device

Hi all,

added intel-gfx@...ts.freedesktop.org and 
intel-xe@...ts.freedesktop.org, as requested in the ticket.

Best regards,
Tim Guttzeit

Am 09.07.25 um 15:32 schrieb Tim Guttzeit:
> 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
>>>>
>

-- 
Tim Guttzeit
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