Date: Sat, 23 May 2026 01:55:17 -0700 From: Chris Torek <chris.torek@gmail.com> To: freebsd-current <freebsd-current@freebsd.org> Subject: AMD, CPPC, etc Message-ID: <CAPx1GvfaDdmj0vkzzinyhGm2mQRKgmOh3fpNXo-cgznoujVY-Q@mail.gmail.com>
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Commit 80d32a6b1d73 (hwpstate_amd(4): CPPC: Switch the default to maximum performance) cranks my 7950-based system from its 90-to-100 watt idle draw up to 150+ watts. If I set dev.hwpstate_amd.0.desired_performance=0, it goes back down, so this isn't too big a deal, but I see that powerd has no idea about using the CPPC control knobs. Should it? If so... the CPPC doesn't do frequency directly, so how would we adapt that? The dev.cpu.0.freq_levels value is 4500/-1 while dev.cpu.0.freq is set to 5499 initially (because desired_performance was set to maximum). (Other than that, I've upgraded the box to -current as of Friday or so. Had to hack up some patches for libgtop and lsof ports to build the ports I use, but it seems to be working fine so far. Getting the updated amdgpu firmware installed was a bit annoying as the system thought that the FreeBSD-15 packages were fine, despite the kernel version mismatch.) Chrishome | help
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