[Bug 236513] HP Thin clients T620/T730 ACPI: Only CPU core 0 detects C2 state
bugzilla-noreply at freebsd.org
bugzilla-noreply at freebsd.org
Thu Mar 28 08:53:52 UTC 2019
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=236513
--- Comment #35 from stockhausen at collogia.de ---
Phew, I see you found the culprit. Although I do not know every single function
I saw a lot of the names during my code analysis.
Regarding HP T620 settings: cpucontrol -m 0xC0010073 /dev/cpuctl0 gives 0x413
(The CPU gets Port+1 from BIOS). So the ACPI tables need:
For T620:
IO (Decode16,
0x0413, // Range Minimum
0x0413, // Range Maximum
0x00, // Alignment
0x08, // Length
)
For T730:
IO (Decode16,
0x1770, // Range Minimum
0x1770, // Range Maximum
0x00, // Alignment
0x08, // Length
)
With these settings C2 states come up fine on both machines.
I will check if all of this hard work at least gives some power saving effects.
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