Dithering #
- How to check if dithering is present or not (Intel Arc and Intel iGPU 11th generation and above): the method using hardware register reading.
- How to check if dithering is present or not (Intel GPU/iGPU): method using reading /sys/kernel/debug/dri/X/i915_display_info.
How to check if dithering is present or not (Intel Arc and Intel iGPU 11th generation and above): a method using hardware register reading #
For Intel Arc and Intel iGPU (11th generation and above), you can check for dithering by reading register 0x70030. In fact, it might be a different register if you have multiple monitors, but for simplicity, you should have only one monitor connected to the graphics card while reading the register. Here are the commands for Debian-based operating systems:
sudo apt update
sudo apt install intel-gpu-tools
sudo intel_reg read 0x70030
My result is 0x00800140 , and we need the 5th bit from the right, so let’s convert it to binary representation:
00000000100000000000000101000000
The 5th bit from the right is 0, meaning dithering is not present. If it is equal to 1, then dithering is present.
Link to the Intel manual where you can find information on registers (including PIPE_MISC, which we worked with above: https://cdrdv2-public.intel.com/703047/intel-gfx-prm-osrc-tgl-vol-02-c-command-reference-registers-part-2.pdf , page 688).
How to check if dithering is present or not (Intel GPU/iGPU): method using reading /sys/kernel/debug/dri/X/i915_display_info #
Try running the command
sudo cat /sys/kernel/debug/dri/X/i915_display_info
in the terminal. The command will output a lot of data, but among it, there should be information about the presence of dithering
dither=yes|no
X is the device number, which can be obtained through
inxi -G
But if there is only one video card, it should be 1.