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Old 11-30-2019, 05:56 PM   #1
garpu
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Ryzen and 5.4 kernel


So with the new 5.4 kernel in current, are the boot params (and possibly disabling of c-states) still needed for Ryzens with the lock-on-idle problem?
 
Old 12-01-2019, 01:56 AM   #2
kingbeowulf
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I'm running a Ryzen 7 3800X on a Gigabyte Aorus X570 mobo 16GB DDR4 RAM, with (for now) Evga GTX 950 and Nvidia driver blob. Install was stock Slackware64-current, kernel 5.4.0, no special boot params, and do far no lock up issues, since yesterday when I added the low profile CPU cooler so I could insert the PS into thus ITX case. Before that it ran for several days with no issues (power supply dangling outside of case) from 5.4.0-rc7.

I'll be running some photonix test suite stress tests soon.
 
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Old 12-01-2019, 04:04 AM   #3
andrew.46
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Does Ryzen Threadripper count? I have seen some reports involving these but my 2950X has no issues with this so far with 5.4.1, although not long testing yet. Mind you no issues also with the 5.3.x kernels which I have been following for some time...
 
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Old 12-01-2019, 10:58 AM   #4
garpu
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I'm guessing it's still an issue for some Ryzens, because this is in /var/log/dmesg:

Code:
[Firmware Bug]: ACPI MWAIT C-state 0x0 not supported by HW (0x0)
 
Old 12-01-2019, 03:39 PM   #5
kingbeowulf
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You didn't say which Ryzen CPU you have. The 1st set of the Zen architecture (Summit Ridge), subsequently fixed in later iterations (Zen+?), had this bug. Zen 2 doesn't suffer from this bug. There are BIOS updates and settings, and newest kernels, that can ease this bug but the only real fix for linux is replacement.
 
  


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