Wake worked with kernel 5.11.0-16-generic. So, I guess this is fixed.
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https://bugs.launchpad.net/bugs/1922439
Title:
X hangs after wake on Mobility Radeon x1400
To manage
Wake from sleep works in Xfce and Plasma in Ubuntu 21.04 when using
kernel 5.12.0-051200rc5-generic from https://kernel.ubuntu.com/~kernel-
ppa/mainline/v5.12-rc5/
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