https://bugs.kde.org/show_bug.cgi?id=460728
Bug ID: 460728
Summary: 1920x1080 resolution setting defaults to interlaced
1080i mode on TV screen, not 1080p
Classification: Plasma
Product: KScreen
Version: 5.25.5
Platform: Debian stable
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: common
Assignee: kscreen-bugs-n...@kde.org
Reporter: m...@fsfe.org
Target Milestone: ---
SUMMARY
Selecting a resolution of 1920x1080 for a connected TV screen that also
supports 1080i (interlaced) will lead to the interlaced mode being activated
and there seems to be no way of selecting the genuine 1080p resolution in
KDE/Plasma.
STEPS TO REPRODUCE
1. Attach TV screen as a secondary monitor to the graphics card.
2. Go into control center's display settings.
3. Set the TV screen to a resolution of "1920x1080" and a refresh rate of "60
Hz".
OBSERVED RESULT
The resolution is actually set to 1080i (interlaced mode) instead of full 1080p
despite the TV device being capable of the latter. That the mode is set to
1080i can be confirmed both with xrandr as well as on the TV device information
menu itself.
Relevant xrandr output after setting up the TV screen:
HDMI-1 connected 1920x1080+1920+0 (normal left inverted right x axis y axis)
1085mm x 610mm
3840x2160 30.00 + 25.00 24.00 29.97 23.98
4096x2160 24.00 23.98
1920x1080 60.00 50.00 59.94 30.00 24.00 29.97 23.98
1920x1080i 60.00* 50.00 59.94
(output truncated, note the asterisk at the 1080i 60Hz mode)
Setting the mode to genuine 1080p using "xrandr --output HDMI-1 --mode
1920x1080" works but gets reset to 1080i by KScreen once the TV screen is
disconnected and reconnected again.
EXPECTED RESULT
Either
a) the resolution list should offer both "1920x1080" as well as "1920x1080i"
(interlaced) to be selected individually
or
b) selecting "1920x1080" should apply the non-interlaced 1080p mode (in case
1080i is not supposed to be offered at all).
SOFTWARE/OS VERSIONS
Linux/KDE Plasma:
KDE Plasma Version: 5.25.5
KDE Frameworks Version: 5.98.0
Qt Version: 5.15.2
Debian GNU/Linux 11, Kernel 5.10.0
ADDITIONAL INFORMATION
Main screen is a 1080p LCD plugged in via DVI. The affected TV is a SONY
KD-49XH9505 plugged in via HDMI.
Both are connected to an Intel UHD Graphics 630 iGPU directly on the
motherboard.
This report applies to X11, I haven't tested Wayland yet.
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