(In reply to Charles Lim from comment #673)

> For those who are looking for a solution or already found a solution, there
> is a new update of AGESA rolling out. The new version 1.0.0.4 claims:
> 
> * Improved system stability when switching through ACPI power states.
> 
> It has arrived on my Asus PRIME B350M days ago, I have upgraded and kept
> default optimised BIOS settings. When I used ZenState to check cpu status,
> the C6 state is now: 
> 
> C6 State - Package - Enabled
> C6 State - Core - Disabled
> 
> Previously they were all enabled, I guessed the new AGESA release finally
> solved this problem from source? I will report back days later to see if the
> system still hangs.

Are you sure about the AGESA version string? For the Dell OptiPlex 5055,
firmware version 1.1.20 [1], running it through *Dell PFS BIOS
Extractor*, and then grepping for `AGESA!` in the strings/hexdump, it
says it includes AGESA version 1.0.0.7a.

    $ strings 1\ --\ 1\ OptiPlex\ System\ BIOS\ v1.1.20.bin | grep -A1 AGESA!
    %pAGESA!V9
    SummitPI-AM4 1.0.0.7a

[1]: 
https://www.dell.com/support/home/de-de/drivers/driversdetails?driverid=w6mw5&oscode=wt64a&productcode=optiplex-5055-ryzen-cpu
[2]: https://github.com/platomav/BIOSUtilities

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https://bugs.launchpad.net/bugs/1690085

Title:
  Ryzen 1800X freeze - rcu_sched detected stalls on CPUs/tasks

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