amd64/171355: FreeBSD 9.1rc1 (and 10-HEAD) not booting on HP Pavilion g6 2147sl

Attilio Rao attilio at
Sun Sep 9 19:40:10 UTC 2012

The following reply was made to PR amd64/171355; it has been noted by GNATS.

From: Attilio Rao <attilio at>
To: Stefano Marinelli <stefano at>
Cc: Alexander Motin <mav at>, bug-followup at
Subject: Re: amd64/171355: FreeBSD 9.1rc1 (and 10-HEAD) not booting on HP
 Pavilion g6 2147sl
Date: Sun, 9 Sep 2012 20:30:00 +0100

 On Sun, Sep 9, 2012 at 8:27 PM, Stefano Marinelli <stefano at> wrote=
 >> It looks like the problem is in HPET timer operation. There are number o=
 f known and handled problems with AMD HPETs, but seems like you've found ne=
 w one. Unluckily, the part of the log about HPET timer didn't fit into the =
 message buffer. The buffer can be tuned with tunable kern.msgbufsize. Defau=
 lt value is 98304. You may try to double it. The specified value must be mu=
 ltiple of 4096.
 > Ok, I rised it and I think the whole dmesg is now on the file.
 > The link is:
 > Also, please note there's another problem on this machine: CPU never goes=
  to low power, keeping fans always on and keeping power consumption high. O=
 n Linux, I can see the cpu lowering its frequencies. On FreeBSD, it seems i=
 t can't detect lower than c1 statuses and other frequencies:
 > [root at pcbsd-8515] ~# sysctl -a | grep cpu
 > cpu     HAMMER
 > device  cpufreq
 > kern.ccpu: 0
 > kern.sched.cpusetsize: 8
 >   <cpu count=3D"2" mask=3D"3">0, 1</cpu>
 >     <cpu count=3D"2" mask=3D"3">0, 1</cpu>
 > kern.smp.cpus: 2
 > kern.smp.maxcpus: 64
 > net.inet.tcp.per_cpu_timers: 0
 > debug.acpi.cpu_unordered: 0
 > debug.cpufreq.verbose: 0
 > debug.cpufreq.lowest: 0
 > hw.ncpu: 2
 > hw.acpi.cpu.cx_lowest: C1
 > 0
 > dev.cpu.0.%desc: ACPI CPU
 > dev.cpu.0.%driver: cpu
 > dev.cpu.0.%location: handle=3D\_PR_.C000
 > dev.cpu.0.%pnpinfo: _HID=3Dnone _UID=3D0
 > dev.cpu.0.%parent: acpi0
 > dev.cpu.0.cx_supported: C1/0 C2/100
 > dev.cpu.0.cx_lowest: C1
 > dev.cpu.0.cx_usage: 100.00% 0.00% last 305us
 > dev.cpu.1.%desc: ACPI CPU
 > dev.cpu.1.%driver: cpu
 > dev.cpu.1.%location: handle=3D\_PR_.C001
 > dev.cpu.1.%pnpinfo: _HID=3Dnone _UID=3D0
 > dev.cpu.1.%parent: acpi0
 > dev.cpu.1.cx_supported: C1/0 C2/100
 > dev.cpu.1.cx_lowest: C1
 > dev.cpu.1.cx_usage: 100.00% 0.00% last 8264us
 > dev.acpi_perf.0.%parent: cpu0
 > dev.acpi_perf.1.%parent: cpu1
 > More, the machine hangs when performing a shutdown or reboot.
 Can you please show the reboot/shutdown console output?
 Also, can you please show the value of sysctl hw.acpi.handle_reboot ?
 Peace can only be achieved by understanding - A. Einstein

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