[Bug 253801] graphics/drm-fbsd13-kmod panic when resuming from sleep

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=253801

Dave Cottlehuber <[email protected]> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |[email protected]
           Severity|Affects Some People         |Affects Many People

--- Comment #1 from Dave Cottlehuber <[email protected]> ---
I see a similar issue here, just 100% reproducible (0 successful resumes out of
more than 11). 13.0-BETA4. No visible panic, just black screen from startup,
but you can tell from the heat of the laptop that its locked up :).

Intel HD Graphics 620 (Dell XPS 13)
- https://wiki.freebsd.org/Laptops/Dell_XPS13_9360 is the exact laptop
- dmesg, acpiconf, sysctl, loader.conf etc
https://gist.github.com/dch/463caaaf723eabf84cf678b618b2d206

tried with & without following loader.conf tunables, and including below patch:
# https://github.com/freebsd/drm-kmod/issues/14
hw.i915kms.enable_psr=0
# cpu/gpu power tuning
drm.i915.enable_rc6=7
kern.hz=100
debug.cpufreq.lowest=600
hint.p4tcc.0.disabled="1"
hint.acpi_throttle.0.disabled="1"

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