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

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Message-ID: <e267ab42-dae2-49aa-9c38-a99e7d801cde@0la.ch>
Date: Wed, 26 Nov 2025 15:53:55 +0100
From: Yaroslav <iam@....ch>
To: Jani Nikula <jani.nikula@...ux.intel.com>, 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 2025-11-26 15:47, Jani Nikula wrote:
> 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.
> 

You can use Vive Pro 2 with a lower resolution, but there is no lower 
resolution option present for BSB/BSB2, their support is always borked 
without this patch, and they are more popular in the linux community.

> 
> BR,
> Jani.
> 
>