https://bugs.kde.org/show_bug.cgi?id=525188
Bug ID: 525188
Summary: Switching screens with hub detected as same device by
KScreen-doctor
Classification: Plasma
Product: KScreen
Version First 6.7.4
Reported In:
Platform: CachyOS
OS: Linux
Status: REPORTED
Severity: minor
Priority: NOR
Component: kscreen-doctor
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
DESCRIPTION
I have a setup that consists on:
- A HDMI screen and a HDMI TV both connected to a hub and then to my computer.
On pressing the hub button I change what device is actually connected to the
computer, while "unplugging" the other one.
- A DVI secondary screen.
Everyday I use my HDMI screen as my primary device (labeled as HDMI-A-2 by
kscreen-doctor) and my DVI screen as my secondary device (labeled as DVI-D-1).
When I click on the hub button my primary screen is disconnected and my TV
connected, but this "instantaneity" seems to be confusing kscreen-doctor.
Kscreen-doctor labels the TV as HDMI-A-2 as well so it tries to use the same
configuration than for my other screen. If I change the configuration for this
device the same issue happens again when I click on the hub to switch back to
my main screen.
STEPS TO REPRODUCE
1. Connect two screen devices through a hub to your computer.
2. Turn on your computer with KDE and change the available screen with your
hub.
OBSERVED RESULT
KScreen-doctor believes it's the same device and it keeps the same
configuration (if you change the configuration it is shared among the two
devices).
EXPECTED RESULT
KScreen-doctor detects the previous screen was disconnected and another screen
was connected, so it loads the presaved configuration for that device
automatically.
SOFTWARE/OS VERSIONS
Operating System: CachyOS Linux
KDE Plasma Version: 6.7.4
KDE Frameworks Version: 6.29.0
Qt Version: 6.11.2
ADDITIONAL INFORMATION
This issue has always happened to me since I installed Linux back a year ago, I
don't think it's a new version issue.
I have a workaround that consists on a script that runs with a keyboard
shortcut and I run it every time I click on the hub button, some seconds after.
I'll copy it here in case it has some useful information.
#!/bin/bash
OUTPUT="HDMI-A-2" # Primary screen OR TV
FIXED="DVI-D-1" # Secondary screen
MAX_WIDTH=$(kscreen-doctor -j | jq -r '
.outputs[]
| select(.name=="'$OUTPUT'")
| .modes[].size.width' | sort -n | tail -1)
if [ "$MAX_WIDTH" -ge 3000 ]; then # I check the max resolution available to
know if it's the TV or the screen
# TV 4K
kscreen-doctor output.$OUTPUT.disable
#kscreen-doctor output.$OUTPUT.disable
kscreen-doctor output.$OUTPUT.enable output.$OUTPUT.mode.3840x2160@60
output.$OUTPUT.scale.2.5 output.$OUTPUT.position.0,0 output.$OUTPUT.hdr.enable
\
output.$FIXED.enable output.$FIXED.position.1536,0
kscreen-doctor output.$OUTPUT.enable output.$OUTPUT.primary
else
# Screen 1080p
kscreen-doctor \
output.$FIXED.enable output.$FIXED.position.1920,0 \
output.$OUTPUT.enable output.$OUTPUT.mode.1920x1080@75
output.$OUTPUT.scale.1 output.$OUTPUT.position.0,0 output.$OUTPUT.hdr.disable
output.$OUTPUT.primary
fi
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