Date: Mon, 14 Nov 2011 19:22:54 +0100 From: kron <kron24@gmail.com> To: freebsd-stable@freebsd.org Subject: 9.0-RC2: regression in power management on VIA Samuel 2 Message-ID: <4EC15C7E.2080802@gmail.com>
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Hi,
I have a few machines (mostly routers) with VIA Samuel 2.
FreeBSD 9.0-RC2 breaks power management on them.
8.2-RELEASE detects:
CPU: VIA Samuel 2 (532.64-MHz 686-class CPU)
Origin = "CentaurHauls" Id = 0x673 Family = 6 Model = 7
Stepping = 3
Features=0x803035<FPU,DE,TSC,MSR,MTRR,PGE,MMX>
and sysctl dev.cpu.0 says:
dev.cpu.0.%desc: ACPI CPU
dev.cpu.0.%driver: cpu
dev.cpu.0.%location: handle=\_PR_.CPU0
dev.cpu.0.%pnpinfo: _HID=none _UID=0
dev.cpu.0.%parent: acpi0
dev.cpu.0.freq: 532
dev.cpu.0.freq_levels: 532/-1 266/-1
dev.cpu.0.cx_supported: C1/0 C2/90 C3/900
dev.cpu.0.cx_lowest: C2
dev.cpu.0.cx_usage: 0.45% 99.54% 0.00% last 783us
In 8.2 I can use dev.cpu.0.cx_lowest=C2 in /etc/sysctl.conf
and powerd runs fine switching between 532 and 266 MHz.
FreeBSD 9.0-RC2 detects:
CPU: VIA Samuel 2 (532.65-MHz 686-class CPU)
Origin = "CentaurHauls" Id = 0x673 Family = 6 Model = 7
Stepping = 3
Features=0x803035<FPU,DE,TSC,MSR,MTRR,PGE,MMX>
AMD Features=0x80000000<3DNow!>
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the only difference
and sysctl dev.cpu.0 is:
dev.cpu.0.%desc: ACPI CPU
dev.cpu.0.%driver: cpu
dev.cpu.0.%location: handle=\_PR_.CPU0
dev.cpu.0.%pnpinfo: _HID=none _UID=0
dev.cpu.0.%parent: acpi0
dev.cpu.0.cx_supported: C1/0
dev.cpu.0.cx_lowest: C1
dev.cpu.0.cx_usage: 100.00% last 208us
Of course, dev.cpu.0.cx_lowest=C2 is not available and powerd
cannot start - "powerd -v" fails:
powerd: lookup freq: No such file or directory
I haven't studied sources yet but it seems to me AMD is detected
(wrong) and for that reason a wrong power management code path
takes place.
Is anybody willing to help me with debugging? I have no
experience in such "low level" programming but at least one
spare machine and some time to waste.
TIA,
Oli
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