linux-kernel - Re: [PATCH v6 2/7] drm/edid: prepare for VESA vendor-specific data block extension

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Message-ID: <afb3d6b3788ad3f8ece48399be7e8e195a62b8b6@intel.com>
Date: Wed, 26 Nov 2025 16:47:34 +0200
From: Jani Nikula <jani.nikula@...ux.intel.com>
To: Yaroslav <iam@....ch>, Yaroslav Bolyukin <iam@...h.pw>, Ville
 Syrjälä
 <ville.syrjala@...ux.intel.com>, Maarten Lankhorst
 <maarten.lankhorst@...ux.intel.com>, Maxime Ripard <mripard@...nel.org>,
 Thomas Zimmermann <tzimmermann@...e.de>, David Airlie <airlied@...il.com>,
 Simona Vetter <simona@...ll.ch>
Cc: Harry Wentland <harry.wentland@....com>, Leo Li <sunpeng.li@....com>,
 Rodrigo Siqueira <siqueira@...lia.com>, Alex Deucher
 <alexander.deucher@....com>, Christian König
 <christian.koenig@....com>,
 Wayne Lin <Wayne.Lin@....com>, amd-gfx@...ts.freedesktop.org,
 linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org
Subject: Re: [PATCH v6 2/7] drm/edid: prepare for VESA vendor-specific data
 block extension

On Wed, 26 Nov 2025, Yaroslav <iam@....ch> wrote:
> On 2025-11-26 15:29, Jani Nikula wrote:
>> On Wed, 26 Nov 2025, Yaroslav <iam@....ch> wrote:
>> The failure mode is: Someone buys a new shiny laptop with eDP MSO, with
>> bigger vendor block, and won't get a picture on screen.
>
> I understand that, I'm only confused because this does seem to be as 
> suitable for backport as this fixed DSC bpp thing is:
>
> Someone buys a VR headset with fixed DSC bpp (Bigscreen Beyond/Bigscreen 
> Beyond 2/Vive Pro 2), and the system is unable to detect them.
>
> Unless eDP MSO with vendor specific data block extended with unset fixed 
> DSC bpp value is much more popular in the wild, that is. I have however 
> failed to discover any devices which have this value present other than 
> the three mentioned VR headsets.

The difference is between an existing and enabled feature working vs. a
new feature working. eDP MSO is expected to work. Also, IIUC you can
still use the VR headsets albeit with a lower resolution. For eDP MSO
you simply get nothing, and even beginning to debug the issue is
problematic, since that is quite possibly the only display on the
device.


BR,
Jani.


-- 
Jani Nikula, Intel