Here is the result of running lspci:-
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alastair@x3400debian:~$ lspci -nn | grep VGA
15:00.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc. [AMD/ATI] Caicos [Radeon HD 6450/7450/8450 / R5 230 OEM] [1002:6779]
alastair@x3400debian:~$
AFAIK I have the right non-free packages installed but how may I change the resolution please?
xrandr seems to tell me that the hardware info is not being picked up:-
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alastair@x3400debian:~$ xrandr
xrandr: Failed to get size of gamma for output default
Screen 0: minimum 800 x 600, current 800 x 600, maximum 800 x 600
default connected primary 800x600+0+0 0mm x 0mm
800x600 75.00*
alastair@x3400debian:~$