Created attachment 81226 [details]
Image showing corruption
As of 0a4bb8663b9fa9b39d13bfb49aea30f2aaecce78 (yes, long ago) the content of a urxvt set transparent (using transset) is corrupted when scrolling.
Created attachment 81227 [details]
Log for HW info
Just the usual gen4 fail I am afraid.
*** This bug has been marked as a duplicate of bug 55000 ***
I'm having the same problem. Can you confirm that you've linked to the right duplicate bug id? I can't see how they're related myself.
Yes, it is the same GPU bug.
For what it's worth, upgrading from the xserver-xorg-video-intel 2.21.6 ubuntu package to a source build of 2.21.15 seems to have fixed my issues... hooray!