The reported issue isn't related only to a single ("current" - probably latest) kernel. The issue isn't stick to any particular kernel; initial report is related to a particular context, of course. When there is some issue related to initial firmware loading (at boot time), this isn't firmware issue, but a driver issue, the driver performing firmware load! Am I wrong?! Here the case is very different. The issue is firmware related, definitely, and the 'symptoms' come up all the time, not only at boot time (at boot is more noticeable, but not restricted to)! There could be (and I believe it is) a driver's 'guilty' too. Before the last firmware update and next rollback, one part (error) from initial report present yet. Especially:
And repeats again and again all the time when 1.173.12 runs (same like all errors from initial report get repeat while 1.173.15 runs) with kernel 4.15.0-88-generic. The error in "/build/linux-WUVVsw/linux-4.15.0/drivers/gpu/drm/i915/intel_display.c" (in my case) brings up once, initially.
Just some clarifications, @harry17
The reported issue isn't related only to a single ("current" - probably latest) kernel. The issue isn't stick to any particular kernel; initial report is related to a particular context, of course. When there is some issue related to initial firmware loading (at boot time), this isn't firmware issue, but a driver issue, the driver performing firmware load! Am I wrong?! Here the case is very different. The issue is firmware related, definitely, and the 'symptoms' come up all the time, not only at boot time (at boot is more noticeable, but not restricted to)! There could be (and I believe it is) a driver's 'guilty' too. Before the last firmware update and next rollback, one part (error) from initial report present yet. Especially:
...
[ +0.100566] radeon 0000:01:00.0: failed VCE resume (-110).
...
And repeats again and again all the time when 1.173.12 runs (same like all errors from initial report get repeat while 1.173.15 runs) with kernel 4.15.0-88-generic. The error in "/build/ linux-WUVVsw/ linux-4. 15.0/drivers/ gpu/drm/ i915/intel_ display. c" (in my case) brings up once, initially.