Xorg switch to full RGB quantization over HDMI
Posted: Dec 30th, '24, 13:45Intel Core i7-13620h UHD Graphic, two physical HDMI ports, two Philips monitors.
Below is the graphics configuration:
Since in Xorg KDE Plasma there is no possibility to set full RGB color quantization support for monitors connected via HDMI from the GUI, I would like to do it somehow.
This can be done, for example, from session startup scripts via commands:
Quantization is set correctly, only that the image disappears for about 2 seconds, which I think is an inconvenience in today's times.
So I wanted to do it via the xorg.conf file so that it is systemwide, but the following file syntax does not change the quantization to full, although the graphics themselves work correctly.
In Wayland, there is an option to set RGB quantization over HDMI to full, but there is no possibility to set Gamma from the GUI. There are packages on Github that allow you to do it in a jumpy way, but I consider the lack of possibility to do it smoothly like in Xorg to be a big inconvenience.
Here is the content of the xorg.conf file. Am I making a mistake somewhere?
Below is the graphics configuration:
- Code: Select all
[root@IT13 Pobrane]# inxi -GSxxz --vs
inxi 3.3.36-00 (2024-09-04)
System:
Kernel: 6.6.65-desktop-2.mga9 arch: x86_64 bits: 64 compiler: gcc v: 12.3.0
Console: pty pts/0 wm: kwin_x11 DM: SDDM Distro: Mageia 9
Graphics:
Device-1: Intel Raptor Lake-P [UHD Graphics] driver: i915 v: kernel
arch: Gen-13 ports: active: HDMI-A-1,HDMI-A-2 empty: DP-1,DP-2
bus-ID: 00:02.0 chip-ID: 8086:a7a8
Device-2: Logitech Webcam C270 driver: snd-usb-audio,uvcvideo type: USB
rev: 2.0 speed: 480 Mb/s lanes: 1 bus-ID: 3-1.2:4 chip-ID: 046d:0825
Display: server: X.org v: 1.21.1.8 with: Xwayland v: 22.1.9
compositor: kwin_x11 driver: X: loaded: modesetting,v4l dri: iris gpu: i915
display-ID: :0 screens: 1
Screen-1: 0 s-res: 3840x1080 s-dpi: 96
Monitor-1: HDMI-A-1 mapped: HDMI-1 pos: primary,right model: Philips 226V4
res: 1920x1080 dpi: 102 diag: 547mm (21.5")
Monitor-2: HDMI-A-2 mapped: HDMI-2 pos: left model: Philips PHL 241E1
res: 1920x1080 dpi: 93 diag: 604mm (23.8")
API: EGL v: 1.5 platforms: device: 0 drv: iris device: 1 drv: swrast gbm:
drv: iris surfaceless: drv: iris x11: drv: iris inactive: wayland
API: OpenGL v: 4.6 vendor: intel mesa v: 24.2.8 glx-v: 1.4 es-v: 3.2
direct-render: yes renderer: Mesa Intel Graphics (RPL-P)
device-ID: 8086:a7a8
API: Vulkan v: 1.3.231 surfaces: xcb,xlib device: 0 type: integrated-gpu
driver: mesa intel device-ID: 8086:a7a8 device: 1 type: cpu
driver: mesa llvmpipe device-ID: 10005:0000
Since in Xorg KDE Plasma there is no possibility to set full RGB color quantization support for monitors connected via HDMI from the GUI, I would like to do it somehow.
This can be done, for example, from session startup scripts via commands:
- Code: Select all
xrandr --output HDMI-1 --mode 1920x1080 --rate 60 --set "Broadcast RGB" "Full"
xrandr --output HDMI-2 --mode 1920x1080 --rate 60 --set "Broadcast RGB" "Full"
Quantization is set correctly, only that the image disappears for about 2 seconds, which I think is an inconvenience in today's times.
So I wanted to do it via the xorg.conf file so that it is systemwide, but the following file syntax does not change the quantization to full, although the graphics themselves work correctly.
In Wayland, there is an option to set RGB quantization over HDMI to full, but there is no possibility to set Gamma from the GUI. There are packages on Github that allow you to do it in a jumpy way, but I consider the lack of possibility to do it smoothly like in Xorg to be a big inconvenience.
Here is the content of the xorg.conf file. Am I making a mistake somewhere?
- Code: Select all
Section "ServerFlags"
Option "DontZap" "False" # disable <Ctrl><Alt><BS> (server abort)
#DontZoom # disable <Ctrl><Alt><KP_+>/<KP_-> (resolution switching)
AllowMouseOpenFail # allows the server to start up even if the mouse does not work
EndSection
Section "Module"
Load "v4l" # Video for Linux
EndSection
Section "Monitor"
Identifier "HDMI-1"
VendorName "Plug'n Play"
Option "Broadcast" "Full"
# ... existing ModeLine definitions for HDMI-1 ...
Gamma 0.4 0.4 0.4
EndSection
Section "Monitor"
Identifier "HDMI-2"
VendorName "Plug'n Play"
Option "Broadcast" "Full"
# ... existing ModeLine definitions for HDMI-2 ...
Gamma 0.4 0.4 0.4
EndSection
Section "Device"
Identifier "device1"
VendorName "Intel Corporation"
BoardName "Intel Kernel Mode setting (Xorg modesetting)"
Driver "modesetting"
Option "DPMS"
EndSection
Section "Screen"
Identifier "screen1"
Device "device1"
Monitor "HDMI-1"
EndSection
Section "Screen"
Identifier "screen2"
Device "device1"
Monitor "HDMI-2"
EndSection
Section "ServerLayout"
Identifier "layout1"
Screen "screen1"
Screen "screen2"
EndSection