>Number: 162578
>Category: kern
>Synopsis: 9.0-RC2's regression in power management on VIA Samuel 2
>Confidential: no
>Severity: serious
>Priority: medium
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Tue Nov 15 09:50:08 UTC 2011
>Closed-Date:
>Last-Modified:
>Originator: Oli Kron
>Release: 9.0-RC2
>Organization:
>Environment:
FreeBSD ephraim.local 9.0-RC2 FreeBSD 9.0-RC2 #1: Sun Nov 13 19:21:14 CET 2011
toor@ephraim.local:/usr/obj/usr/src/sys/LEXVIA i386
>Description:
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
>How-To-Repeat:
install 9.0-RC2 on VIA Samuel 2 and:
1. sysctl dev.cpu.0 to see available frequencies and Cx states
2. try start powerd
>Fix:
>Release-Note:
>Audit-Trail:
>Unformatted:
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