OK, now we know the i915 driver, in my environment is NOT fixed with just
the microcode. I get GPU hangs whether the microcode is up-to-date or not.
This boot had NO kernel command line options (besides Debian defaults):
GRUB_CMDLINE_LINUX_DEFAULT="quiet pcie_aspm=force"
I don't remember if I
I rebooted with these grub config options:
GRUB_CMDLINE_LINUX_DEFAULT="quiet pcie_aspm=force intel_idle.max_cstate=1"
In addition to an almost immediate GPU hang, my r8169 driver Ethernet
card failed to load its firmware causing a full network outage.
I rebooted to see if it was a fluke, but no:
I rebooted with the GRUB options intel_idle.max_cstate=1
i915.disable_power_well=1 i915.enable_dc=0 which my research shows
sometimes helps with these kinds of GPU hangs.
For quite some time performance was acceptable, but less than 20 hours
later I triggered a GPU hang by switching desktops
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