https://bugs.freedesktop.org/show_bug.cgi?id=110637
--- Comment #5 from Alexander Mezin mezin.alexander@gmail.com --- And BTW with kernel 4.19.40 and latest git firmware (https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git/...) monitors switch off on boot as soon as amdgpu driver loads and never turn on again