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

Stefano Marinelli stefano at
Sun Sep 9 19:30:07 UTC 2012

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

From: Stefano Marinelli <stefano at>
To: Alexander Motin <mav at>
Cc: attilio 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 21:27:28 +0200

 > It looks like the problem is in HPET timer operation. There are number =
 of known and handled problems with AMD HPETs, but seems like you've =
 found new 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. Default value is 98304. You may try to double it. The =
 specified value must be multiple 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. On Linux, I can see the cpu lowering its frequencies. On FreeBSD, =
 it seems it can't detect lower than c1 statuses and other frequencies:
 [root at pcbsd-8515] ~# sysctl -a | grep cpu
 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.
 Thank you,

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