https://bugzilla.kernel.org/show_bug.cgi?id=103211

--- Comment #2 from Justin Dray <[email protected]> ---
Thanks, I went from the top down, and this is what I've observed:

# echo reboot > /sys/power/disk
# echo disk > /sys/power/state
worked; it hibernated, rebooted and went straight back to the terminal in ~6-7
seconds as expected. Doing it a second time however, gave me a black
unresponsive screen (with the keyboard backlight still on; this silly model has
no power light). Forcing it to power off after a minute at this black screen
and then powering it on, it resumed from hibernate! Doing this test a couple
more times resulting in random instability. Even after only a single suspend,
sometimes it would hang a short time after coming back from hibernation (30-60
seconds)

# echo platform > /sys/power/disk
# echo disk > /sys/power/state
Without pm_test set to core: Hangs when it should have rebooted. Keyboard
backlight stays on and the display is blank. Holding in power for 5 seconds to
shut down and then powering it back on resumes from where it was. Doing this a
second time resulted in it sitting at the prompt without returning from the
'echo disk' command for about 30-40 seconds. Then it had the same outcome as
the first time I ran it.

When I set pm_test to core for each of the above, they both appeared to work.
But with a very high (read all except one time) chance of it locking up
completely after 60 seconds. I think this may have to do with the brcmfmac
driver. removing the brcmfmac module before doing the tests left it stable for
some time. reloading the brcmfmac driver later resulted in it not finding any
wifi networks. But there is a seperate bug for brcmfmac issues:
https://bugzilla.kernel.org/show_bug.cgi?id=103201

Logs (with pm_test set to core):
reboot mode: https://gist.github.com/justin8/eef75db997219001a1e6
platform mode: https://gist.github.com/justin8/524547161e2e42d440f9

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