Re: [PATCH] PM: Use hibernate flows for system power off

[Martin Steigerwald <martin@lichtvoll.de>]

Hi.

Thanks for your reply, Mario.

Mario Limonciello - 14.05.25, 19:06:03 CEST:
> > I will eventually see I bet.
> > 
> > Currently I only compile my own kernel for my current ThinkPad which
> > is not affected by this issue.

> As a debugging tactic for your problem you can try to save your shutdown
> log to the EFI pstore by adding this to your kernel command line for a
> boot.
> 
> efi_pstore.pstore_disable=N printk.always_kmsg_dump=Y
> 
> Then the next boot if you have the systemd-pstore service enabled it
> will move the log into /var/lib/systemd/pstore.
> 
> If you don't have it enabled you can run this to manually do it one
> time.
> 
> sudo systemctl start systemd-pstore.service
> 
> Hopefully that log will be helpful in identifying your problem.

Thanks for the hint on how to debug things like this without some serial 
console or so.

As I use Devuan and thus do not have Systemd installed, I will need to 
find a different way to obtain the log from the pstore. But according to 
kernel documentation this seems to be easy enough¹:

mount -t pstore pstore /sys/fs/pstore

I can indeed mount it and there are a lot of "dmesg-efi_pstore-
[timestamp]" files where time stamp seems to be in seconds since beginning 
of 1970.

[1] https://docs.kernel.org/admin-guide/pstore-blk.html

Thanks,
-- 
Martin