https://bugs.kde.org/show_bug.cgi?id=466623
Bug ID: 466623
Summary: Unable to display screen if computer starts without
HDMI cable connected (or without HDMI signal)
Classification: Plasma
Product: KScreen
Version: 5.27.2
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: common
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
Created attachment 156839
--> https://bugs.kde.org/attachment.cgi?id=156839&action=edit
Log when black screen
SUMMARY
***
If the computer is booted without HDMI signal (disconnecting the HDMI cable or
having another computer active on a KVM switch), then when connecting the
computer's HDMI cable or turning on the computer on the KVM switch, the screen
looks completely black and it is not possible to recover the signal. Pressing
Ctrl + F2 activates the HDMI signal and you can access another console and from
there start X11 with KDE, but it is completely impossible to recover the screen
in the first session (Ctrl + F1).
***
STEPS TO REPRODUCE
Test 1: with KVM switch (IMPORTANT: without it having EDID emulation)
1. With computer 1 active on the KVM switch, turn on computer 2 that has Linux.
2. Wait a few minutes for the system to load completely and the KDE login
screen to appear.
3. Switch control on the KVM switch to the Linux computer.
4. The screen is completely black and there is no way to recover the HDMI
signal in that session.
Test 2: no KVM switch
1. Disconnect the HDMI cable from the computer.
2. Boot the computer with Linux.
3. Wait a few minutes for the system to load completely and the KDE login
screen to appear.
4. Connect the HDMI cable to the computer.
5. The screen is completely black and there is no way to recover the HDMI
signal in that session.
Attached log in case you can see something.
SOFTWARE/OS VERSIONS
Operating System: Manjaro Linux
KDE Plasma Version: 5.27.2
KDE Frameworks Version: 5.103.0
Qt Version: 5.15.8
Kernel Version: 6.2.1-x64v3-xanmod1 (64-bit)
Graphics Platform: X11 --> It indicates the session that I managed to start
from another console, but I don't know the KDE login screen if it is on X11 or
Wayland, which is what was displayed when the screen fails, showing black after
connecting the HDMI cable.
Processors: 8 × AMD Ryzen 5 3550H with Radeon Vega Mobile Gfx
Memory: 29,3 GiB of RAM
Graphics Processor: AMD Radeon Vega 8 Graphics
Manufacturer: BESSTAR TECH LIMITED
Product Name: UM350
Tested that this error does not occur with GNOME.
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