[Bug 211807] [drm:drm_dp_mst_dpcd_read] *ERROR* mstb 000000004e6288dd port 3: DPCD read on addr 0x60 for 1 bytes NAKed

[bugzilla-daemon at kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=211807

crptdngl71 at gmx.net changed:

           What    |Removed                     |Added
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                 CC|                            |crptdngl71 at gmx.net

--- Comment #22 from crptdngl71 at gmx.net ---
I have the same issue. I have found a way to trigger issue quite reliably.

Operating System: Debian GNU/Linux
KDE Plasma Version: 5.25.3
KDE Frameworks Version: 5.94.0
Qt Version: 5.15.4
Kernel Version: 5.18.12-1-siduction-amd64 (64-bit)
Graphics Platform: X11
Processors: 4 × Intel® Core™ i7-6600U CPU @ 2.60GHz
Memory: 7.7 GiB of RAM
Graphics Processor: Mesa Intel® HD Graphics 520
Manufacturer: Dell Inc.
Product Name: Latitude E7470
I am using an external DELL monitor running @2560x1600 pixel @60Hz via
DisplayPort connection. Notebook lid is closed.
==> This system works really stable with no issues for most of time, apart from
the black screen that is described here.

While at first it seemed the issue occurs randomly and more or less seldom, I
finally have found a website that almost always triggers this issue. It occurs
that often now, that it even is not logged in dmesg all times.

Unfortumately, to reproduce the issue, you need to have an account at website
http://www.spinchat.de (there is an English version as well, if that should
matter to you).

How to replicate issue:
(1) Log into spinchat.
(2) Use spinchat as one would normally do, i.e. create an account if you do not
have one, create user name, log into standard server, enter any chat room, open
dialogue window with any chat buddy.

(3) Spinchat rooms have a kind of menu bar with soft buttons at bottom of
screen labelled "Hauptseite" ("Main Site", always visible), and a number of
room names and chat person buddy names. They are simply small rectangular boxes
with another room name, main site access, chat buddy nick name. You can hover
mouse arrow over them and mouse icon will become a hand etc.

(4) BUG, happens with this website always when I use it, sometimes it won't
show, sometimes it shows several times consecutively.
==> While in a chat room, hover mouse cursor over menu icon "Hauptseite" or
another room name menu icon button, or another chat person menu icon button.
The mouse button changes to a hand and after that screen becomes dark. issue
triggered.
==> This does not always happen.
==> This happens in many many cases, it happens way too often to say it is
unrelated to black screen issue.
==> Sometimes black screen is seen for several seconds until it wakes up,
sometimes it is very briefly.
==> Sometimes dmesg gets an extra log entry, mostly it does not after it has
been logged once or a few times.
==> Issue is triggered while only hovering mouse over soft menu key buttons and
also when actively pressing mouse button over such a soft menu key button.

This really is an annoying error and it has been around for such a long time I
wonder why it could not yet be fixed.

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