It only took a week of bisecting to track down the kernel regression:
fe0f1e3bfdfeb53e18f1206aea4f40b9bd1f291c is the first bad commit
commit fe0f1e3bfdfeb53e18f1206aea4f40b9bd1f291c
Author: Ville Syrjälä <ville.syrj...@linux.intel.com>
Date: Thu Oct 1 18:16:35 2020 +0300
drm/i915: Shut down displays gracefully on reboot
Implement the pci .shutdown() hook in order to quiesce the
hardware prior to reboot. The main purpose here is to turn
all displays off. Some displays/other drivers tend to get
confused if the state after reboot isn't exactly as they
expected.
One specific example was the Dell UP2414Q in MST mode.
It would require me to pull the power cord after a reboot
or else it would just not come back to life. Sadly I don't
have that at hand anymore so not sure if it's still
misbehaving without the graceful shutdown, or if we
managed to fix something else since I last tested it.
For good measure we do a gem suspend as well, so that
we match the suspend flow more closely. Also stopping
all DMA and whatnot is probably a good idea for kexec.
I would expect that some kind of GT reset happens on
normal reboot so probably not totally necessary there.
v2: Use the pci .shutdown() hook instead of a reboot notifier (Lukas)
Do the gem suspend for kexec (Chris)
Cc: Lukas Wunner <lu...@wunner.de>
Cc: Chris Wilson <ch...@chris-wilson.co.uk>
Signed-off-by: Ville Syrjälä <ville.syrj...@linux.intel.com>
Link:
https://patchwork.freedesktop.org/patch/msgid/20201001151640.14590-1-ville.syrj...@linux.intel.com
Reviewed-by: Jani Nikula <jani.nik...@intel.com>
Reviewed-by: Chris Wilson <ch...@chris-wilson.co.uk>
drivers/gpu/drm/i915/i915_drv.c | 16 ++++++++++++++++
drivers/gpu/drm/i915/i915_drv.h | 1 +
drivers/gpu/drm/i915/i915_pci.c | 8 ++++++++
3 files changed, 25 insertions(+)
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https://bugs.launchpad.net/bugs/1923335
Title:
[i915] At shutdown the spinner logo disappears and a second later it
comes back frozen for a while (in kernel 5.11 and later)
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