(I was originally going to glom this onto one of the other Raspberry Pi/November 2021 threads, but the symptoms seem a little different.)
After updating from the August 2021 release to the November 2021 release on my Raspberry Pi 4, I started having an issue with the display going blank on boot up. The last thing I see is the initial text output (about mounting the SD card and such), then the screen goes blank. Unplugging and plugging back in the HDMI connector gets it working again with the normal Kodi UI. I’m using the official RPi4 power supply (https://www.raspberrypi.com/products/type-c-power-supply/) and everything was working fine on reboots before the update. The only USB device being powered is the OSMC remote dongle. The TV was originally plugged into HDMI1 on the Pi and I tried swapping to HDMI0, but it didn’t seem to make a difference.
The normal way to poke at display information on a Pi (tvservice) doesn’t seem to be working in OSMC:
# tvservice -S tvservice is not supported when using the vc4-kms-v3d driver. Similar features are available with standard linux tools such as modetest from libdrm-tests.
I was afraid to install libdrm-tests as it only exists in buster-backports and wanted to upgrade libdrm stuff out from under osmc as a dependency.