https://bugs.kde.org/show_bug.cgi?id=473685
Bug ID: 473685
Summary: Allow enabling a dummy display output
Classification: Plasma
Product: KScreen
Version: 5.27.7
Platform: Archlinux
OS: Linux
Status: REPORTED
Severity: wishlist
Priority: NOR
Component: common
Assignee: kscreen-bugs-n...@kde.org
Reporter: k...@dragonic.eu
Target Milestone: ---
This is a weird feature request, since the use case is fairly niche but
annoying to work around.
I have a desktop PC with AMD Radeon RX 6800 with 3 outputs connected to it:
- 2x 1440p 144Hz displays connected over DisplayPort,
- A Samsung soundbar connected over HDMI. This is a problem, because...
HDMI is the only way to get uncompressed, low-latency-ish PCM 7.1 audio sent to
the soundbar from a PC. (It can also accept uncompressed 2.1 or compressed 5.1
over Toslink, but not full-range 7.1 it's capable of dealing with. It can also
accept 2.1 audio over Bluetooth with significant latency penalty.)
The soundbar shows up in the system as a normal display and has to be enabled
in order to make it possible to play audio on it (if disabled,
PipeWire/PulseAudio can't configure the audio output profile on the respective
HDMI Audio device). This requires the user to place that display somewhere in
the workspace and it's annoying that you can move the cursor off-screen with no
visual indication or Win+Left/Right random windows into the void.
The feature request I have is to make it possible to enable a given output as a
"dummy" display - enable a device, set resolution as requested in the display
configuration panel etc, but just render the entire display contents black and
don't let the desktop user interact with that display output in any way. This
allows using that device as an audio output without extra annoyances. Mirroring
a display is not a solution, since other displays run at 1440p144Hz which the
soundbar can't handle.
This is all on the Wayland session.
KDE Plasma Version: 5.27.7
KDE Frameworks Version: 5.109.0
Qt Version: 5.15.10
---
What `kscreen-console outputs` sees for that soundbar HDMI output:
Id: 2
Name: "HDMI-A-1"
Type: "HDMI"
Connected: true
Enabled: true
Priority: 2
Rotation: KScreen::Output::None
Pos: QPoint(2560,480)
MMSize: QSize(1150, 650)
FollowPreferredMode: false
Size: QSize(640, 480)
Scale: 1
Clones: None
Mode: "16"
Preferred Mode: "0"
Preferred modes: ("0")
Modes:
"0" "1280x720@60" QSize(1280, 720) 60
"1" "1920x1080@60" QSize(1920, 1080) 60
"10" "720x576@50" QSize(720, 576) 50
"11" "720x480@60" QSize(720, 480) 60
"12" "720x480@60" QSize(720, 480) 60
"13" "720x480@60" QSize(720, 480) 59.94
"14" "720x480@60" QSize(720, 480) 59.94
"15" "720x480@60" QSize(720, 480) 59.94
"16" "640x480@60" QSize(640, 480) 60
"17" "640x480@60" QSize(640, 480) 59.94
"18" "640x480@60" QSize(640, 480) 59.94
"2" "1920x1080@60" QSize(1920, 1080) 59.94
"3" "1280x720@60" QSize(1280, 720) 60
"4" "1280x720@60" QSize(1280, 720) 59.94
"5" "1280x720@50" QSize(1280, 720) 50
"6" "1280x720@50" QSize(1280, 720) 50
"7" "1024x768@60" QSize(1024, 768) 60.004
"8" "800x600@60" QSize(800, 600) 60.317
"9" "720x576@50" QSize(720, 576) 50
EDID Info:
Device ID: "xrandr-Data Export Corporation-EP-HDMI-RX-1"
Name: "EP-HDMI-RX"
Vendor: "Data Export Corporation"
Serial: "1"
EISA ID: ""
Hash: "6f454a2eafcd6df2a93f7879cea59fd9"
Width: 115
Height: 65
Gamma: 2.2
Red: QQuaternion(scalar:1, vector:(0.618164, 0.347656, 0))
Green: QQuaternion(scalar:1, vector:(0.280273, 0.605469, 0))
Blue: QQuaternion(scalar:1, vector:(0.152344, 0.0634766, 0))
White: QQuaternion(scalar:1, vector:(0.3125, 0.329102, 0))
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