Apologies for spamming, guys. I tried another fix for this bug, as suggested here: https://gitlab.freedesktop.org/drm/amd/-/issues/695#note_313722 and it seems to be working.
I rebuilt the xserver-xorg-video-amdgpu-hwe-18.04_19.0.1 package with https://github.com/freedesktop/xorg-xf86-video- amdgpu/commit/a2b32e72fdaff3007a79b84929997d8176c2d512 reverted and my machine is able to resume from suspend/hibernate just fine while keeping both DRI3 and KWin's OpenGL compositing enabled. Here's the deb for you to test: https://drive.google.com/file/d/1AK- nKuSkYqGKT09I7juddfIiJNViO86T/view?usp=sharing Note that this is for 18.04 and you have to have the HWE stack enabled first: apt-get install --install-recommends linux-generic-hwe-18.04 xserver-xorg-hwe-18.04 ** Bug watch added: gitlab.freedesktop.org/drm/amd/-/issues #695 https://gitlab.freedesktop.org/drm/amd/-/issues/695 -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xserver-xorg-video-amdgpu in Ubuntu. https://bugs.launchpad.net/bugs/1849084 Title: Freeze on system-resume caused by kwin and amdgpu driver To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/kwin/+bug/1849084/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp