linux-kernel - Re: [PATCH 15/17] drm/amd/display: Trigger ALLM if it's available

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Message-ID: <34863839c6d54e911597192bba6a54c3b9c97b75@intel.com>
Date: Tue, 20 Jan 2026 13:45:57 +0200
From: Jani Nikula <jani.nikula@...ux.intel.com>
To: Daniel Stone <daniel@...ishbar.org>, Michel Dänzer
 <michel.daenzer@...lbox.org>
Cc: Tomasz Pakuła <tomasz.pakula.oficjalny@...il.com>,
 alexander.deucher@....com, harry.wentland@....com, sunpeng.li@....com,
 maarten.lankhorst@...ux.intel.com, mripard@...nel.org,
 tzimmermann@...e.de, airlied@...il.com, simona@...ll.ch,
 siqueira@...lia.com, dri-devel@...ts.freedesktop.org,
 amd-gfx@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
 bernhard.berger@...il.com, ville.syrjala@...ux.intel.com
Subject: Re: [PATCH 15/17] drm/amd/display: Trigger ALLM if it's available

On Tue, 20 Jan 2026, Daniel Stone <daniel@...ishbar.org> wrote:
> Hi,
>
> On Tue, 20 Jan 2026 at 10:33, Michel Dänzer <michel.daenzer@...lbox.org> wrote:
>> On 1/19/26 02:11, Tomasz Pakuła wrote:
>> > [Why]
>> > ALLM automatically puts TVs into low latency modes (gaming modes) which
>> > we basically always want for PC use, be it gaming, or using precise
>> > inputs like mice and keyboards.
>>
>> How about e.g. video playback though?
>>
>> It might make sense to let the Wayland compositor control this, e.g. via the Wayland content type hint protocol.
>
> Yes, I think this should be a connector property. We'll happily
> implement support for Weston as the uAPI vehicle.

Content type might be a useful policy hint also for content adaptive
brightness control and the like.

Ville and I have also tossed around ideas for passing the "power mode"
to the DRM drivers (e.g. Performance, Balanced, Power Saver). There are
various cases where the drivers need to make policy decisions that would
be better decided by userspace. However, it gets complicated and
unweildy if all of them are individual knobs. A power mode input might
be useful in making the latency decisions too.

BR,
Jani.

-- 
Jani Nikula, Intel