https://bugs.kde.org/show_bug.cgi?id=484941
Bug ID: 484941
Summary: Multi-display support no longer works for third
display
Classification: KDE Neon
Product: neon
Version: unspecified
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: general
Assignee: neon-b...@kde.org
Reporter: jbeard...@gmail.com
CC: j...@jriddell.org, neon-b...@kde.org, sit...@kde.org
Target Milestone: ---
Created attachment 168067
--> https://bugs.kde.org/attachment.cgi?id=168067&action=edit
Configure Display Settings, DP-3 failing to detect proper resolutions
SUMMARY
For a number of months I had 3 identical ViewSonic QHD (2560x1440) displays
working almost perfectly on my Neon installation. This was with an AMD Radeon
RX 5600 (two screens) and a third screen on the build-in graphics (also AMD) on
my Asus ROG STRIX B650E-F w/AMD Ryzen 9 7950X. At this point Neon was up to
KDE 5.27.
It worked more or less the same in both X11 and Wayland, albeit with small
differences and very minor issues. I was very excited about the upcoming 6.0
release of KDE.
The 6.0 update actually went pretty well for me, but since then one display or
another is now running at 640x480. This will be different displays from time
to time. I am unsure which version of KDE was current when this first
happened.
I have replaced the video card with an AMD Radeon RX 6600, just to have all
displays controlled by one device (thinking that might be a complicating factor
for plasma. All behavior is the same however. Both Wayland and X11 fail in
similar fashion, though X11 can be almost made to work via xrandr.
STEPS TO REPRODUCE
1. Boot latest Neon using AMD video and at least 3 HDMI or DP connected
displays
2. Configure display settings
OBSERVED RESULT
Only two of the displays will offer resolution choices above 640x480 (4:3)
EXPECTED RESULT
All displays should offer appropriate resolutions for the attached displays (in
my case, 2560x1440 (16:9)
SOFTWARE/OS VERSIONS
Operating System: KDE neon 6.0
KDE Plasma Version: 6.0.3
KDE Frameworks Version: 6.0.0
Qt Version: 6.6.3
Kernel Version: 6.5.0-26-generic (64-bit)
Graphics Platform: Wayland
Processors: 32 × AMD Ryzen 9 7950X 16-Core Processor
Memory: 46.7 GiB of RAM
Graphics Processor: AMD Radeon RX 6600
Manufacturer: ASUS
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