I've just performed to apt trio (update, upgrade and dist-upgrade) and
following a reboot my system went very glitchy, especially o the screen.

There was a warning in the stop start boot up, along with copious
errors like this;
[ 21.260287] amdgpu 0000:09:00.0: amdgpu: SMU: I'm not done with your
previous command!
[ 25.797572] amdgpu 0000:09:00.0: amdgpu: SMU: I'm
not done with your previous command!
[ 30.325590] amdgpu
0000:09:00.0: amdgpu: SMU: I'm not done with your previous command!
[34.857594] amdgpu 0000:09:00.0: amdgpu: SMU: I'm not done with your
previous command!
[ 39.378689] amdgpu 0000:09:00.0: amdgpu: SMU: I'm
not done with your previous command!
[ 43.914156] amdgpu 0000:09:00.0: amdgpu: SMU: I'm not done with your
previous command!
[48.439014] amdgpu 0000:09:00.0: amdgpu: SMU: I'm not done with your
previous command!
[ 54.227334] amdgpu 0000:09:00.0: amdgpu: SMU: I'm
not done with your previous command!

I temporarily fixed the problem by rebooting to the previous kernel,but
in investigating came across this oddity in the naming of my
installed kernels

user@system: dpkg --list | grep linux-image
rc  linux-image-5.10.0-6-amd64                    5.10.28-1
              amd64        Linux 5.10 for 64-bit PCs (signed) 
rc  linux-image-5.10.0-7-amd64                    5.10.40-1
           amd64        Linux 5.10 for 64-bit PCs (signed) 
rc  linux-image-5.10.0-8-amd64                    5.10.46-5
           amd64        Linux 5.10 for 64-bit PCs (signed) 
rc  inux-image-5.10.0-9-amd64                    5.10.70-1
           amd64        Linux 5.10 for 64-bit PCs (signed) 
ii  linux-image-5.14.0-0.bpo.2-amd64              5.14.9-2~bpo11+1
           amd64        Linux 5.14 for 64-bit PCs (signed) 
ii  linux-image-5.15.0-0.bpo.2-amd64              5.15.5-2~bpo11+1
           amd64        Linux 5.15 for 64-bit PCs (signed) 
ii  linux-image-5.15.0-0.bpo.3-amd64              5.15.15-2~bpo11+1
           amd64        Linux 5.15 for 64-bit PCs (signed) 
ii   linux-image-amd64 

Looking for clubies on why the last image doesn't fit the pattern, and
the best way to purge it.

T.I.A.
terryc