On Mon, Jan 06, 2020 at 08:00:10PM +0000, Russell L. Harris wrote: > > It might also be helpful to show the output of "lspci -nn" > > VGA compatible controller [0300]: Advanced Micro Devices, > Inc. [AMD/ATI] Trinity [Radeon HD 7540D] [1002:9991] > > > > output of "dmesg | grep -i firmware" > > ... > [drm: radeon_pci_probe [radeon]] *ERROR* radeon kernel modesetting for > R600 or later requires firmware installed > ...
Sounds like you need to install firmware-amd-graphics. It's in the non-free section, so make sure you've enabled non-free and contrib.