There's likely more than one bug, but this is the one I've followed as the most egregious experience I've had in quite some time, if ever, on Linux. GPU hang o

There's likely more than one bug, but this is the one I've followed as the most egregious experience I've had in quite some time, if ever, on Linux. GPU hang on transition to idle https://gitlab.freedesktop.org/drm/intel/issues/673 https://gitlab.freedesktop.org/drm/intel/issues/673 I don't know whether this qualifies as a break with no regressions in user space rule. I didn't run into it on either 5.3 or 5.5. My understanding is the backport to fix on 5.4 would be too complicated. Therefore I wonder why not just revert the whole thing from 5.4? I don't know the answer to that. I gave up on it totally and moved to 5.5rc kernels, rather than deal with 5.4. Given this fact of 5.4's behavior, I think it's a bad idea for a distribution to pick that kernel to use, if they can't do the backport themselves, and yet expect to support i915 hardware. Yep, it's an LTS kernel. Ordinarily it's reasonable to pick an LTS for a distribution, but not this time around. Maybe Ubuntu should have shipped a late 5.3.x and then updated to 5.4 once fixed? I don't know if it even has been fixed now in 5.4, although I haven't gotten any emails on that bug since March 10.