Date: Mon, 08 Jun 2026 18:29:37 +0000 From: bugzilla-noreply@freebsd.org To: bugs@FreeBSD.org Subject: [Bug 295941] Minisforum MS01 instability after 7b26353a59d6 hwpstate_intel: Disable package control on hybrid CPU Message-ID: <bug-295941-227@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=295941 Bug ID: 295941 Summary: Minisforum MS01 instability after 7b26353a59d6 hwpstate_intel: Disable package control on hybrid CPU Product: Base System Version: 16.0-CURRENT Hardware: amd64 OS: Any Status: New Severity: Affects Only Me Priority: --- Component: kern Assignee: bugs@FreeBSD.org Reporter: gallatin@FreeBSD.org I'm opening this bug as requested by Adrian & so that others can find the bug in case the have the same problem. I'm not asking for a reversion of the commit mentioned in the subject. I have a Minisforum MS-01, which is basically a laptop CPU in a desktop motherboard that I use as a workstation. It is running the latest firmware (1.27). When I first got the box last summer, I would encounter the box powering cycling as soon as I typed make -j20 buildkernel if dev.hwpstate_intel.X.epp was set lower than 44. So I added setting those sysctls to 44 to /etc/sysctl.conf and forgot about it. After I upgraded to a recent main version (1ee4b5fd824a fork: Drop an uneeded PHOLD/PRELE pair), the instability returned. And was present for even higher values of epp (I think I even tried 100). I tried reverting 7b26353a59d6 and it "fixed" the problem. I asked claude for help, and it told me about iccmax, which caps the instantaneous CPU power. Setting this to 8*100 seems to solve my issues (it defaults to 8*210). Setting is done as: cpucontrol -m 0x601=0x320 /dev/cpuctl0 I suspect this is something about a 110v supply on a US power brick vs a 220v supply on a Chinese power brick. Adrian asked me to raise this issue to point out how power saving changes can have odd effects. -- You are receiving this mail because: You are the assignee for the bug.home | help
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