Why does the Xilinx Video Mixer DRM driver report flip_done timed out and commit wait timed out when setting a display mode using modetest?

The error occurs due to a timeout while configuring the HDMI output. In some display configurations, it waits for user input or an interrupt while the DRM/KMS operation is active.

Execute the output command and provide an interrupt (press the Enter key) after approximately 10–14 seconds. Then check whether the output is configured successfully.

If the output is set correctly, the console log will appear as shown below.

root@versal-iwg57m:~# modetest -D a4090000.v_mix -s 41:1920x1080-60@BG24 &
[1] 805

trying to open device 'i915'...done

root@versal-iwg57m:~# setting mode 1920x1080-60.00Hz on connectors 41, crtc 39
[1]+ Stopped(SIGTTIN) modetest -D a4090000.v_mix -s 41:1920x1080-60@BG24

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