Re: [gentoo-user] ryzen and c-state poweroffs?

[Jack]

On 2019.05.03 12:28, Spackman, Chris wrote:
>
> All,
>
> I set up a new AMD computer (moved disk from previous Intel
> computer). After some struggles with bios settings, I got it to boot
> properly and updated for the new hardware. All seemed fine, but then
> it
> started "crashing" when left alone. From Googling, it seems that it
> has
> something to do with the bios powering down drives that aren't in use,
> but then not being able to power them back up.
>
> When it "crashes" (goes into a coma?), I have to use the power button
> to
> turn it off and then back on. As it starts up, the root partition is
> clean, but home has to be recovered - which seems to indicate that it
> is
> indeed an issue with the mobo/bios turning off the root drive.
>
> I found a Linux site that suggested this line in dmesg as a symptom:
>
> > [Firmware Bug]: ACPI MWAIT C-state 0x0 not supported by HW (0x0)
>
> The solution was to turn of C-states in the bios. I forget the exact
> wording right now, but I could not find it in my bios. I tried to
> turn off
> everything that seemed related to power saving, but several did not
> have
> an "off" option. So, I am still getting the error.
>
> For now, I set up a cron job to move a file from /root to /tmp every
> 15
> minutes. This seems to work, but it is obviously not a long term
> solution.
>
> I checked for a bios update, but there was not one available.
>
> Has anyone else experienced this? Is there maybe a /sys/ or /proc/
> file
> I can tweak to avoid bios powering things off?
>
> Thanks.
It's only a guess, but I'd suggest looking through the kernel docs to  
see if there is any boot command line parameter that might do this.

Jack