Please try a 5.10 kernel as well as a 5.4 kernel so we can get a better idea of which versions are affected:
https://kernel.ubuntu.com/~kernel-ppa/mainline/?C=M;O=D ** Tags added: amdgpu radeon ** Package changed: xorg (Ubuntu) => linux (Ubuntu) ** Summary changed: - AMD. Extreme slowness in xorg after upgrading to the 5.8.0-44-generic kernel (Ubuntu 20.04.2) + [amdgpu] [radeon] Extreme slowness in xorg after upgrading to the 5.8.0-44-generic kernel (Ubuntu 20.04.2) ** Changed in: linux (Ubuntu) Status: New => Incomplete -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xorg in Ubuntu. https://bugs.launchpad.net/bugs/1916948 Title: [amdgpu] [radeon] Extreme slowness in xorg after upgrading to the 5.8.0-44-generic kernel (Ubuntu 20.04.2) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1916948/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : [email protected] Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp

