linux-kernel - Re: Powered off Philips TV sends corrupt EDID causing flickering

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Message-ID: <ac27ba40-0f44-4503-a167-25e4f1211900@molgen.mpg.de>
Date:   Thu, 23 Nov 2023 15:17:33 +0100
From:   Paul Menzel <pmenzel@...gen.mpg.de>
To:     Jani Nikula <jani.nikula@...ux.intel.com>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        dri-devel@...ts.freedesktop.org
Subject: Re: Powered off Philips TV sends corrupt EDID causing flickering

Dear Jani,


Thank you for your reply.

Am 22.11.23 um 11:38 schrieb Jani Nikula:
> On Tue, 21 Nov 2023, Paul Menzel wrote:

>> Connecting a USB Type-C port replicator [1] to the only USB Type-C port
>> of the Dell XPS 13 9360 with Debian sid/unstable and Debian’s Linux
>> kernel 6.10.5, and then connecting a Philips 40PFL5206H/12 TV device,
>> that is powered off or in standby, to the HDMI port, Linux logs:

[…]

> Depending on how the port replicator works, this may not come from the
> TV at all.
> 
> And all of this probably depends on GPU and driver, which are not
> mentioned.

Sorry for just mentioning the laptop model. It uses the device below:

     00:02.0 VGA compatible controller [0300]: Intel Corporation HD 
Graphics 620 [8086:5916] (rev 02) (prog-if 00 [VGA controller])

> If it's i915, please see [1] on how to file a bug.

Thank you for taking the time to tell me the proper forum. I created the 
two issues below:

1.  EDID has corrupt header [2]
2.  No image on Philips TV when turning on while connected over 
HDMI/USB-C port replicator (`[drm] *ERROR* Link Training Unsuccessful`) [3]


Kind regards,

Paul


> [1] https://drm.pages.freedesktop.org/intel-docs/how-to-file-i915-bugs.html
[2]: https://gitlab.freedesktop.org/drm/intel/-/issues/9705
[3]: https://gitlab.freedesktop.org/drm/intel/-/issues/9707