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ever had 1GB+ kern.log (and syslog) from changing monitors?

From Robert Riches <spamtrap42@jacob21819.net>
Newsgroups comp.os.linux.misc
Subject ever had 1GB+ kern.log (and syslog) from changing monitors?
Date 2026-01-13 04:57 +0000
Organization none-at-all
Message-ID <slrn10mbk6i.uec.spamtrap42@one.localnet> (permalink)

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Each of my /var/log/syslog and /var/log/kern.log is over 1GB
today after unplugging two monitors and plugging in two different
monitors.

The hardware is about 5 years old:
  - Motherboard: Asus Pro WS X570-ACE
  - Processor: AMD Ryzen 7 5800X 8-Core Processor
  - GPU: MSI Radeon RX5500XT
  - old monitors: 2x Asus VW266H
  - new monitors: 2x Asus PA279CV

Software is Devuan Daedalus.

The old monitors were connected to the first two DisplayPort
connectors via (probably no-name) DisplayPort-to-HDMI adapters
and a Kopul HDMI switchers.

The new monitors are connected to the same first two DisplayPort
connectors via PearStone DisplayPort-to-HDMI adapters and the
same Kopul HDMI switchers.

(The switchers let me push a button and see security camera
output on one monitor, then push another button to go back to
computer stuff.)

I had tested the new monitors and adapter cables via the GPU's
third DisplayPort connector, with and without going through the
switcher.  All tested out well.

Today, while the machine would have been showing the text console
and not X, I physically installed the new monitors on the
above-desk mounts and plugging everything in.  The switchers
showed that there was signal on the input line, but the monitors
stayed in standby mode.  About the time I plugging things in,
syslog and kern.log show the following:

2026-01-12T12:00:37.370890-08:00 one kernel: [180281.980042] [drm:retrieve_link_
cap [amdgpu]] *ERROR* retrieve_link_cap: Read receiver caps dpcd data failed.
2026-01-12T12:00:38.627964-08:00 one kernel: [180283.233347] ------------[ cut h
ere ]------------
2026-01-12T12:00:38.627976-08:00 one kernel: [180283.234095] WARNING: CPU: 7 PID
: 13497 at drivers/gpu/drm/amd/amdgpu/../display/dc/core/dc.c:3076 dc_update_pla
nes_and_stream+0x342/0x880 [amdgpu]

then lists of kernel modules, register dumps, stack traces
and etc.

then a ton of these:

2026-01-12T12:00:38.754724-08:00 one kernel: [180283.364640] [drm:dc_add_plane_to_context [amdgpu]] *ERROR* Head pipe not found for stream_state 000000000268a75b !
2026-01-12T12:00:38.758717-08:00 one kernel: [180283.365909] [drm:dc_add_plane_to_context [amdgpu]] *ERROR* Head pipe not found for stream_state 000000000268a75b !
2026-01-12T12:00:38.758720-08:00 one kernel: [180283.367165] [drm:dc_add_plane_to_context [amdgpu]] *ERROR* Head pipe not found for stream_state 000000000268a75b !

at a rate of about 980 per second for a total of about 6,803,402
lines and just over 1GB of text in each file.  Thankfully, a
clean reboot of the machine accomplished via a thin-client
machine, the GPU, switchers, and monitors signed a peace treaty
and are now happily working together.

Has anyone else seen anything similar to that?

Thanks.

-- 
Robert Riches
spamtrap42@jacob21819.net
(Yes, that is one of my email addresses.)

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ever had 1GB+ kern.log (and syslog) from changing monitors? Robert Riches <spamtrap42@jacob21819.net> - 2026-01-13 04:57 +0000
  Re: ever had 1GB+ kern.log (and syslog) from changing monitors? c186282 <c186282@nnada.net> - 2026-01-13 00:32 -0500
    Re: ever had 1GB+ kern.log (and syslog) from changing monitors? 🇵🇱Jacek Marcin Jaworski🇵🇱 <jmj@energokod.gda.pl> - 2026-01-13 08:09 +0100
      Re: ever had 1GB+ kern.log (and syslog) from changing monitors? Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-01-13 08:16 +0000
        Re: ever had 1GB+ kern.log (and syslog) from changing monitors? "Carlos E.R." <robin_listas@es.invalid> - 2026-01-13 11:22 +0100
          Re: ever had 1GB+ kern.log (and syslog) from changing monitors? Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-01-13 19:51 +0000
            Re: ever had 1GB+ kern.log (and syslog) from changing monitors? "Carlos E.R." <robin_listas@es.invalid> - 2026-01-14 14:42 +0100
              Re: ever had 1GB+ kern.log (and syslog) from changing monitors? Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-01-14 20:54 +0000
                Re: ever had 1GB+ kern.log (and syslog) from changing monitors? "Carlos E.R." <robin_listas@es.invalid> - 2026-01-14 23:14 +0100
                Re: ever had 1GB+ kern.log (and syslog) from changing monitors? Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-01-14 22:36 +0000
                Re: ever had 1GB+ kern.log (and syslog) from changing monitors? "Carlos E.R." <robin_listas@es.invalid> - 2026-01-15 14:40 +0100
                Re: ever had 1GB+ kern.log (and syslog) from changing monitors? The Natural Philosopher <tnp@invalid.invalid> - 2026-01-15 13:54 +0000
                Re: ever had 1GB+ kern.log (and syslog) from changing monitors? Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-01-16 04:20 +0000
                Re: ever had 1GB+ kern.log (and syslog) from changing monitors? "Carlos E.R." <robin_listas@es.invalid> - 2026-01-16 21:40 +0100
                Re: ever had 1GB+ kern.log (and syslog) from changing monitors? Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-01-16 21:03 +0000
                Re: ever had 1GB+ kern.log (and syslog) from changing monitors? "Carlos E.R." <robin_listas@es.invalid> - 2026-01-16 22:23 +0100
                Re: ever had 1GB+ kern.log (and syslog) from changing monitors? Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-01-16 21:41 +0000
                Re: ever had 1GB+ kern.log (and syslog) from changing monitors? "Carlos E.R." <robin_listas@es.invalid> - 2026-01-16 22:53 +0100
                Re: ever had 1GB+ kern.log (and syslog) from changing monitors? Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-01-17 20:34 +0000
                Re: ever had 1GB+ kern.log (and syslog) from changing monitors? "Carlos E.R." <robin_listas@es.invalid> - 2026-01-17 22:57 +0100
                Re: ever had 1GB+ kern.log (and syslog) from changing monitors? Marc Haber <mh+usenetspam1118@zugschl.us> - 2026-01-18 11:14 +0100
                Re: ever had 1GB+ kern.log (and syslog) from changing monitors? Nuno Silva <nunojsilva@invalid.invalid> - 2026-01-18 10:44 +0000
                Re: ever had 1GB+ kern.log (and syslog) from changing monitors? "Carlos E.R." <robin_listas@es.invalid> - 2026-01-18 12:50 +0100
                Re: ever had 1GB+ kern.log (and syslog) from changing monitors? Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-01-18 21:04 +0000
                Re: ever had 1GB+ kern.log (and syslog) from changing monitors? "Carlos E.R." <robin_listas@es.invalid> - 2026-01-18 23:04 +0100
                Re: ever had 1GB+ kern.log (and syslog) from changing monitors? Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-01-19 00:46 +0000
                Re: ever had 1GB+ kern.log (and syslog) from changing monitors? Nuno Silva <nunojsilva@invalid.invalid> - 2026-01-19 09:42 +0000
                Re: ever had 1GB+ kern.log (and syslog) from changing monitors? Marc Haber <mh+usenetspam1118@zugschl.us> - 2026-01-19 09:56 +0100
                Re: ever had 1GB+ kern.log (and syslog) from changing monitors? "Carlos E.R." <robin_listas@es.invalid> - 2026-01-19 14:29 +0100
                Re: ever had 1GB+ kern.log (and syslog) from changing monitors? Marc Haber <mh+usenetspam1118@zugschl.us> - 2026-01-19 15:53 +0100
                Re: ever had 1GB+ kern.log (and syslog) from changing monitors? "Carlos E.R." <robin_listas@es.invalid> - 2026-01-19 22:46 +0100
                Re: ever had 1GB+ kern.log (and syslog) from changing monitors? Richard Kettlewell <invalid@invalid.invalid> - 2026-01-19 23:05 +0000
                Re: ever had 1GB+ kern.log (and syslog) from changing monitors? "Carlos E.R." <robin_listas@es.invalid> - 2026-01-20 02:36 +0100
                Re: ever had 1GB+ kern.log (and syslog) from changing monitors? Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-01-20 03:02 +0000
                Re: ever had 1GB+ kern.log (and syslog) from changing monitors? Richard Kettlewell <invalid@invalid.invalid> - 2026-01-20 08:37 +0000
                Re: ever had 1GB+ kern.log (and syslog) from changing monitors? "Carlos E.R." <robin_listas@es.invalid> - 2026-01-20 14:04 +0100
                Re: ever had 1GB+ kern.log (and syslog) from changing monitors? Richard Kettlewell <invalid@invalid.invalid> - 2026-01-20 17:37 +0000
                Re: ever had 1GB+ kern.log (and syslog) from changing monitors? "Carlos E.R." <robin_listas@es.invalid> - 2026-01-20 21:01 +0100
                Re: ever had 1GB+ kern.log (and syslog) from changing monitors? Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-01-20 20:24 +0000
                Re: ever had 1GB+ kern.log (and syslog) from changing monitors? Richard Kettlewell <invalid@invalid.invalid> - 2026-01-20 22:25 +0000
                Re: ever had 1GB+ kern.log (and syslog) from changing monitors? Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-01-20 20:36 +0000
                Re: ever had 1GB+ kern.log (and syslog) from changing monitors? "Carlos E.R." <robin_listas@es.invalid> - 2026-01-20 23:22 +0100
                Re: ever had 1GB+ kern.log (and syslog) from changing monitors? Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-01-19 23:24 +0000
                Re: ever had 1GB+ kern.log (and syslog) from changing monitors? "Carlos E.R." <robin_listas@es.invalid> - 2026-01-20 02:39 +0100
                Re: ever had 1GB+ kern.log (and syslog) from changing monitors? Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-01-23 05:48 +0000
                Re: ever had 1GB+ kern.log (and syslog) from changing monitors? "Carlos E.R." <robin_listas@es.invalid> - 2026-01-23 14:07 +0100
                Re: ever had 1GB+ kern.log (and syslog) from changing monitors? Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-01-23 21:19 +0000
                Re: ever had 1GB+ kern.log (and syslog) from changing monitors? "Carlos E.R." <robin_listas@es.invalid> - 2026-01-23 22:26 +0100
                Re: ever had 1GB+ kern.log (and syslog) from changing monitors? Bobbie Sellers <bliss-sf4ever@dslextreme.com> - 2026-01-23 21:45 -0800
                Re: ever had 1GB+ kern.log (and syslog) from changing monitors? Harold Stevens <wookie@aspen.localdomain> - 2026-01-24 04:18 -0600
                Re: ever had 1GB+ kern.log (and syslog) from changing monitors? Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-01-18 21:02 +0000
                Re: ever had 1GB+ kern.log (and syslog) from changing monitors? "Carlos E.R." <robin_listas@es.invalid> - 2026-01-18 23:04 +0100
                Re: ever had 1GB+ kern.log (and syslog) from changing monitors? Nuno Silva <nunojsilva@invalid.invalid> - 2026-01-16 23:33 +0000
                Re: ever had 1GB+ kern.log (and syslog) from changing monitors? "Carlos E.R." <robin_listas@es.invalid> - 2026-01-17 14:33 +0100
                Re: ever had 1GB+ kern.log (and syslog) from changing monitors? Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-01-17 20:35 +0000
                Re: ever had 1GB+ kern.log (and syslog) from changing monitors? "Carlos E.R." <robin_listas@es.invalid> - 2026-01-17 22:56 +0100
                Re: ever had 1GB+ kern.log (and syslog) from changing monitors? Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-01-18 01:51 +0000
                Re: ever had 1GB+ kern.log (and syslog) from changing monitors? "Carlos E.R." <robin_listas@es.invalid> - 2026-01-18 12:55 +0100
                Re: ever had 1GB+ kern.log (and syslog) from changing monitors? Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-01-18 21:02 +0000
                Re: ever had 1GB+ kern.log (and syslog) from changing monitors? "Carlos E.R." <robin_listas@es.invalid> - 2026-01-18 23:05 +0100
                Re: ever had 1GB+ kern.log (and syslog) from changing monitors? Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-01-19 00:46 +0000
                Re: ever had 1GB+ kern.log (and syslog) from changing monitors? Nuno Silva <nunojsilva@invalid.invalid> - 2026-01-16 23:30 +0000
                Re: ever had 1GB+ kern.log (and syslog) from changing monitors? "Carlos E.R." <robin_listas@es.invalid> - 2026-01-17 14:36 +0100
                Re: ever had 1GB+ kern.log (and syslog) from changing monitors? The Natural Philosopher <tnp@invalid.invalid> - 2026-01-17 18:25 +0000
                Re: ever had 1GB+ kern.log (and syslog) from changing monitors? Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-01-17 20:33 +0000
                Re: ever had 1GB+ kern.log (and syslog) from changing monitors? Richard Kettlewell <invalid@invalid.invalid> - 2026-01-18 10:48 +0000
                Re: ever had 1GB+ kern.log (and syslog) from changing monitors? Harold Stevens <wookie@aspen.localdomain> - 2026-01-17 10:23 -0600
              Re: ever had 1GB+ kern.log (and syslog) from changing monitors? Richard Kettlewell <invalid@invalid.invalid> - 2026-01-18 10:43 +0000
                Re: ever had 1GB+ kern.log (and syslog) from changing monitors? "Carlos E.R." <robin_listas@es.invalid> - 2026-01-18 12:59 +0100
                Re: ever had 1GB+ kern.log (and syslog) from changing monitors? Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-01-18 21:06 +0000
                Re: ever had 1GB+ kern.log (and syslog) from changing monitors? "Carlos E.R." <robin_listas@es.invalid> - 2026-01-18 23:06 +0100
                Re: ever had 1GB+ kern.log (and syslog) from changing monitors? Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-01-19 00:48 +0000
                Re: ever had 1GB+ kern.log (and syslog) from changing monitors? Nuno Silva <nunojsilva@invalid.invalid> - 2026-01-19 09:44 +0000
        Re: ever had 1GB+ kern.log (and syslog) from changing monitors? Nuno Silva <nunojsilva@invalid.invalid> - 2026-01-13 11:40 +0000
    Re: ever had 1GB+ kern.log (and syslog) from changing monitors? Robert Riches <spamtrap42@jacob21819.net> - 2026-01-14 03:27 +0000
  Re: ever had 1GB+ kern.log (and syslog) from changing monitors? "Carlos E.R." <robin_listas@es.invalid> - 2026-01-13 11:24 +0100
    Re: ever had 1GB+ kern.log (and syslog) from changing monitors? Nuno Silva <nunojsilva@invalid.invalid> - 2026-01-13 11:43 +0000
    Re: ever had 1GB+ kern.log (and syslog) from changing monitors? Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-01-13 19:52 +0000

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