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A comment on New Lenovo ThinkPad Range with Ryzen 4000 and 4000 Pro Mobile. Parent comment

Re:New Lenovo ThinkPad Range with Ryzen 4000 and 4000 Pro Mo... by sam_lowry_ on Thursday May 07, 2020 @03:40PM (#23107285)
Sounds like the famous AMD Ryzen soft lockup bug. Adding something like

    processor.mac_cstate=5 rcu_nocbs=0-7
to the boot options solved it for me.

See for instance this: https://community.amd.com/thread/225795

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