I can reproduce something similar, except that 'setupcon' as root (i.e. 'sudo setupcon') *does* clear it up. However, I can only reproduce it after switching to X and back. That indicates that Matthew Garrett's kernel fix to make it restore the font on VT switch didn't really take properly.
Is it possible that the font needs to be restored after unblanking the VT, rather than before?
I can reproduce something similar, except that 'setupcon' as root (i.e. 'sudo setupcon') *does* clear it up. However, I can only reproduce it after switching to X and back. That indicates that Matthew Garrett's kernel fix to make it restore the font on VT switch didn't really take properly.
Is it possible that the font needs to be restored after unblanking the VT, rather than before?