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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 grumpopotamus on Thursday May 07, 2020 @03:16PM (#23107023)
The last AMD laptop I bought froze randomly every few hours on Ubuntu, and there is no way to turn on my keyboard backlight on my Thinkpad T480 on Ubuntu. I gave up trying to fix these problems a while ago, and last time I checked nobody had found a fix for either issue for my specific laptop models. I'd be very hesitant to buy AMD or Lenovo before I had strong evidence that there are no serious issues on Linux.
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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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Re:New Lenovo ThinkPad Range with Ryzen 4000 and 4000 Pro Mo... by martin8412 on Thursday May 07, 2020 @04:10PM (#23107659)
Granted I had to do a firmware update(supported through Linux), but I have Linux running on a X395 without any problems.
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