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No external display on P1 Gen3 after upgrading System Firmware to 1.26
The summary says it all.
I was on 1.24 and upgraded to 1.26, and the external monitor (through hdmi) immediately stopped working after reboot (not even POST shows).
xrandr/gnome-settings still detects that the external hdmi port is connected to an 'unknown monitor', but even using standard vga resolutions, the external monitor won't even get a signal.
I reverted to 1.24 and everything was OK again. I haven't had the time to test 1.25 yet.
Can you please tell me which OS you're running and the kernel version?