Linux / X470 Taichi hangs
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Category: Technical Support
Forum Name: AMD Motherboards
Forum Description: Question about ASRock AMD motherboards
URL: https://forum.asrock.com/forum_posts.asp?TID=11264
Printed Date: 27 Jul 2025 at 3:20am Software Version: Web Wiz Forums 12.04 - http://www.webwizforums.com
Topic: Linux / X470 Taichi hangs
Posted By: kschendel
Subject: Linux / X470 Taichi hangs
Date Posted: 06 Apr 2019 at 3:52pm
This is in the way of a "public service announcement", specifically for the X470 Taichi Ultimate but I suspect that similar problems might exist on other boards.
Build is a 2700X in a Taichi Ultimate, RX 550 graphics. I had been extremely stable on kernel 4.17.19 and later since last summer, until I updated my BIOS to the 2.00 version. I started getting occasional freezes, where the entire machine would lock up hard with nothing in the MCE logs or anywhere else. I was blaming this on the RX 550 (and indeed the amdgpu driver has its issues), but with kernel 5.0.x it got so that a freeze would happen within minutes.
The cure turns out to be to avoid deep C-states. The older BIOS had a "disable C6 state" option, which is apparently gone in the new version. I haven't yet figured out whether a kernel command line of "processor.max_cstates=1" suffices, or whether one needs to disable Global C-States entirely in the BIOS (OC Tweaker, AMD CBS, CPU options); the difference is some 10 watts at idle which is minimal. I can say that "processor.max_cstates=5" does NOT work to avoid the hangs.
It's only been a day so far, but that's more uptime than I've had in a couple weeks. Other input welcome.
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Replies:
Posted By: xhue
Date Posted: 06 Apr 2019 at 5:35pm
Thanks for the info!
AFAIK even kernel 5.0 has issues with Ryzens still.
Depending on your needs you may want to consider running Linux on a VM. This way you will let the hypervisor deal with the real power management, but you still have the other benefits of Linux.
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Posted By: paologab
Date Posted: 06 Apr 2019 at 8:44pm
Not here, kernel 5.0.5. I?™m also testing deeply the ram @3466 (rated @3200) with no issues so far.
------------- AMD Ryzen 7 2700X w/Wraith prism x470 Taichi bios 3.50 16gb HX432C16PB3K2/16 (hynix H5AN8G8NCJR-UHC) M.2 970 EVO, SATA SSD, 2 SATA HDD AMD Radeon RX 580 8G OC Linux Kernel 5.4 Manjaro Stable XFCE
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Posted By: Onox
Date Posted: 06 Apr 2019 at 9:17pm
Hi. Yes, it's a widespread issue. There are freezes with other boards too, and even Ryzen laptops freeze with Linux :/ You can find a lot of information here : https://bugzilla.kernel.org/show_bug.cgi?id=196683
I have the X370 Taichi and I had similar issues even on Windows, until I started using the "Power Supply Idle Control" > "Typical Current Idle" option. I'm not 100% sure that this entirely fixes it for me, as I had the computer freeze when resuming from sleep twice, but only twice and that was some time ago. I also had the "Ryzen segfault bug" and had to RMA my 1700X (I'm currently waiting for the new CPU to be shipped), but since you have a 2700X you should not be affected by that flaw (as far as I know, only the Ryzen 1000 series may have it).
I also read that the default SOC voltage is too low on Asrock boards; this could explain why people who overclock never experience any freezes.
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Posted By: kschendel
Date Posted: 07 Apr 2019 at 4:14am
paologab wrote:
Not here, kernel 5.0.5. I?�m also testing deeply the ram @3466 (rated @3200) with no issues so far.
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5.0.5 hung just as often as any other 5.0.x for me.
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