Jani wrote... >Does it work all right with the stock UEFI boot, and you're only seeing >issues with coreboot? With the stock UEFI solution (AMI) the USB-C HDMI adapters work booting from the same Ubuntu disk. Interestingly, they don’t work under Windows 11 with the AMI firmware so I’m not convinced their implementation is correct either. >Is /sys/kernel/debug/dri/0/i915_vbt the same for both? Yes, the VBT file built into the coreboot firmware is the one I extracted from /sys/kernel/debug/dri/0/i915_vbt having booted into Ubuntu. I’ll raise it as a bug (albeit I don’t think it is the driver at fault). -Andy.
