diff options
| author | Cy Schubert <cy@FreeBSD.org> | 2026-01-05 04:53:51 +0000 |
|---|---|---|
| committer | Cy Schubert <cy@FreeBSD.org> | 2026-01-22 04:36:33 +0000 |
| commit | ad9932995cf8f93143ff033712016d95b5cb7a50 (patch) | |
| tree | bcf3d60b0ba099f6563d6f97be5353f3c3bd01d0 | |
| parent | eacc501eff52db16b7b784c89a3a4a03c9a3ef34 (diff) | |
hwpstate: Add CPPC enable tunable
The Framework 13 runs very hot the maximum frequency is possible. By
disabling CPPC (reverting to Cool`n'Quiet 2.0) we can use powerd to
limit the CPU frequency to 2200, thereby reducing the CPU temperature.
Some systems may run slower with CPPC enabled. See PR/292615 for that
bug.
Those experiencing either of these issues may add the following to
their loader.conf or device.hints to disable CPPC:
machdep.hwpstate_amd_cppc_enable="0"
PR: 292615
Reviewed by: lwhsu, olce
Differential revision: https://reviews.freebsd.org/D54803
| -rw-r--r-- | sys/x86/cpufreq/hwpstate_amd.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/sys/x86/cpufreq/hwpstate_amd.c b/sys/x86/cpufreq/hwpstate_amd.c index 5676d8ce7dae..34838753e221 100644 --- a/sys/x86/cpufreq/hwpstate_amd.c +++ b/sys/x86/cpufreq/hwpstate_amd.c @@ -179,6 +179,11 @@ SYSCTL_BOOL(_machdep, OID_AUTO, hwpstate_pkg_ctrl, CTLFLAG_RDTUN, &hwpstate_pkg_ctrl_enable, 0, "Set 1 (default) to enable package-level control, 0 to disable"); +static bool hwpstate_amd_cppc_enable = true; +SYSCTL_BOOL(_machdep, OID_AUTO, hwpstate_amd_cppc_enable, CTLFLAG_RDTUN, + &hwpstate_amd_cppc_enable, 0, + "Set 1 (default) to enable AMD CPPC, 0 to disable"); + static device_method_t hwpstate_methods[] = { /* Device interface */ DEVMETHOD(device_identify, hwpstate_identify), @@ -667,7 +672,8 @@ hwpstate_probe(device_t dev) sc = device_get_softc(dev); - if (amd_extended_feature_extensions & AMDFEID_CPPC) { + if (hwpstate_amd_cppc_enable && + (amd_extended_feature_extensions & AMDFEID_CPPC)) { sc->flags |= PSTATE_CPPC; device_set_desc(dev, "AMD Collaborative Processor Performance Control (CPPC)"); |