Thanks. I still feel the first solution we should be aiming for is
(another) new HDMI cable. If you've tried a few (without any adapters!)
and none work then I would treat this as a proper kernel bug. The
closest existing one I have found is:
https://bugs.freedesktop.org/show_bug.cgi?id=105601
[72227.300557] [drm:drm_dp_dual_mode_detect [drm_kms_helper]] *ERROR*
Unexpected DP dual mode adaptor ID 50
[72228.173908] [drm:drm_dp_dual_mode_detect [drm_kms_helper]] *ERROR*
Unexpected DP dual mode adaptor ID 50
[72229.956316] [drm:drm_dp_dual_mode_detect [drm_kms_helper]] *ERROR*
I mean if your monitor shows any faults at all while using it then each
time open a Terminal window and run:
dmesg
Then please copy and paste the most recent messages (probably mentioning
"kernel: i915" or "kernel: drm") to here.
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"If you see changes like that after boot then please attach output from
'dmesg' showing the period of time when the change occurred."
I'm sorry, I'm not sure what you're asking me to watch for here. Can you
clarify?
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If you see changes like that after boot then please attach output from
'dmesg' showing the period of time when the change occurred.
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https://bugs.launchpad.net/bugs/1849484
FYI: While apport-collect was running, my screens went blank briefly and
then when they came back my monitor configuration was wrong: the ultra-
wide monitor was at a lower resolution than it's supposed to be and the
two monitors' relative positions were not configured correctly.
Unplugging the
apport information
** Tags added: apport-collected ubuntu
** Description changed:
I have an LG ultra-wide (2560x1080) monitor.
Sometimes when I plug it into my laptop, whose screen was working fine
before I plugged it in, both screens go black but nothing else happens.
I can still
> Synology Drive does kernel stuff -- I believe it uses inotify to
monitor directories for changes -- so I'm suspecting that there's
something misbehaving in the kernel and something that Synology Drive
does is banging up against it.
I think you might be right.
** Changed in: linux (Ubuntu)
I tried a different cable. It didn't help.
Also, I can trigger my monitors freaking out as described above merely
by launching the Synology Drive Client when the ultra-wide monitor is
connected.
Also, the issue seems to be triggered even if the applet isn't visible
in my top bar, i.e., even if
It's not clear to me how this can be a cable or monitor issue when it
only happens in Xorg and it happens much more frequently when one
particular app is running (see comment #4). Having said that, I will try
to find a spare HDMI cable and test.
I am not using an adapter, I'm plugging an HDMI
** No longer affects: mutter (Ubuntu)
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https://bugs.launchpad.net/bugs/1849484
Title:
[X1 Carbon 7, i915, HDMI] Ultra-wide monitor recognized properly when
plugged in
Hmm, it shouldn't be a multi-stream problem. It looks like you only need
HDMI v1.3 to drive that resolution and your laptop supports HDMI 1.4b
already.
So mainly I suspect a bad HDMI cable, bad HDMI adaptor, or just faulty
EDID data coming from the monitor.
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