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

[Rodrigo Vivi <rodrigo.vivi@intel.com>]

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
>