It would be great if someone can help me. I was using the two external monitors plugged into ThinkPad-T14s-Gen-1 that has installed only Ubuntu 20.04, the laptop has AMD Ryzen 7 pro 4750u with AMD integrated graphics.

One monitor was plugged into HDMI and other one into USB C socket, the laptop has two USB C sockets, one can be used both for charging and display, other one only for data.

Everything was working fine but, both of monitors were detected but after some updates, after I did some updates(apt get update and upgrade) from 20.04 to 20.04.1 and 20.04.02, one day it suddenly is not detecting the one monitor plugged into USB C socket, its not even working after unplugging and plugging it back in(before it would work if I unplug and plug it back). But I don't think this was the reason.

The cable USB is good, its new and I have bought another one USB to check but they both dont work so its not about cables, it must be software issue.

However I suspect the reason why the monitor stopped responding is because once I had accidentally clicked suspend option when I wanted to shutdown the pc. It was suspended only for few moments and when I logged back, one monitor was not detected anymore.

I had installed timeshift program so I tried to go back in time, to snapshot before this happened but it didn't do anything, it was the same.

I am sharing my output of xrandr, and btw I am absolute beginner to Linux. I have unplugged the monitor from HDMI, since its working but I plugged in the other one into USB C but its not detecting, its only detecting the laptop built in display(eDP):

Screen 0: minimum 320 x 200, current 1920 x 1080, maximum 16384 x 16384 eDP connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 309mm x 173mm 1920x1080 60.00*+ 1680x1050 60.00 1280x1024 60.00 1440x900 60.00 1280x800 60.00 1280x720 60.00 1024x768 60.00 800x600 60.00 640x480 60.00 HDMI-A-0 disconnected (normal left inverted right x axis y axis) DisplayPort-0 disconnected (normal left inverted right x axis y axis) DisplayPort-1 disconnected (normal left inverted right x axis y axis)

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