Firefox was just an example, anything that's heavy on the GPU yields the same problem, and yes I did have the right knobs enabled on Firefox and can confirm tha

Firefox was just an example, anything that's heavy on the GPU yields the same problem, and yes I did have the right knobs enabled on Firefox and can confirm that HW was indeed working. Recently however I had to disable it, see https://bugzilla.mozilla.org/show_bug.cgi?id=1759947 https://bugzilla.mozilla.org/show_bug.cgi?id=1759947