** No longer affects: mutter (Ubuntu)
** No longer affects: gnome-control-center (Ubuntu)
** Summary changed:
- HDMI monitor detected but black screen (has a preferred mode but no current
mode) with Intel UHD graphics on kernel 5.9
+ Samsung SMBX2250 monitor detected but black screen (has a pre
** Attachment added: "Xrandr output with Plasma"
https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/1907870/+attachment/580/+files/plasmaxrandr.txt
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That's a good point. We might be able to rule out mutter... Can you
please run this command in Plasma desktop:
xrandr --verbose > plasmaxrandr.txt
and attach the resulting file here?
** Changed in: mutter (Ubuntu)
Status: New => Incomplete
** Changed in: gnome-control-center (Ubuntu)
I tried with Plasma desktop... Same result.
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https://bugs.launchpad.net/bugs/1907870
Title:
HDMI monitor detected but black screen (has a preferred mode but no
current mode) with Inte
That sounds like a different bug.
The cause of this bug appears to be related to your HDMI monitor not
having a current mode set. Although it does list a 'preferred' mode.
That much is clear in the xrandr output.
Failing to set a current mode is most likely a bug in 'libmutter'.
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I read about a bug similar to this affecting mutter 3.34,but said that
they can see the poi ter in the second screen. In this case my monitor
falls in no-signal after a few seconds of trying to get the correct
mode.
(pls, sorry for my English)
Regards
JM
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I think this is probably a bug in 'mutter'. Less likely a bug in 'gnome-
control-center' or 'xorg-server'.
** Summary changed:
- Secondary screen detected but black screen with Intel UHD graphics on kernel
5.9
+ HDMI monitor detected but black screen (has a preferred mode but no current
mode) w