Console options for legacy-free mini-itx server?

Ian Smith smithi at
Fri Nov 19 03:14:49 UTC 2010

On Thu, 18 Nov 2010, John Baldwin wrote:
 > On Thursday, November 18, 2010 4:07:27 pm Andrew Reilly wrote:
 > > Hi John,
 > > 
 > > On 18/11/2010, at 23:59 , John Baldwin wrote:
 > > 
 > > > You used devinfo -v, so it shows the devices that exist even if they failed
 > > > to attach.  Try just using 'devinfo' and seeing if est1 still shows up.
 > > 
 > > OK, you're right: running without -v shows only est0:
 > > 
 > > nexus0
 > >   apic0
 > >   ram0
 > >   acpi0
 > >     cpu0
 > >       acpi_perf0
 > >       est0
 > >       p4tcc0
 > >       cpufreq0
 > >     cpu1
 > >       p4tcc1
 > >       cpufreq1
 > >     acpi_button0
 > >     pcib0
 > > <...>
 > > 
 > > Is est. involved in the reboot question?
 > Probably not.

I'm not so sure, having just noticed something that I missed last time:

device_attach: acpi_perf1 attach returned 6
est0: <Enhanced SpeedStep Frequency Control> on cpu0
p4tcc0: <CPU Frequency Thermal Control> on cpu0
device_attach: acpi_perf1 attach returned 6
est1: <Enhanced SpeedStep Frequency Control> on cpu1
est: CPU supports Enhanced Speedstep, but is not recognized.
est: cpu_vendor GenuineIntel, msr 16
device_attach: est1 attach returned 6
p4tcc1: <CPU Frequency Thermal Control> on cpu1

I'd mis-read or assumed that first line as being for acpi_perf0, rather 
than an earlier? attempt to attach acpi_perf1 at that time.

>From cpufreq(4):

     The following device drivers offer absolute frequency control via the
     cpufreq interface.  Usually, only one of these can be active at a time.

     acpi_perf  ACPI CPU performance states
     est        Intel Enhanced SpeedStep
     ichss      Intel SpeedStep for ICH
     powernow   AMD PowerNow! for K7 and K8
     smist      Intel SMI-based SpeedStep for PIIX4

Apart from never having seen est0 attach but est1 not, my understanding 
from both the manual and from having read some of the code over the time 
is that acpi_perf0 should only attach if eg est0 didn't - is that wrong?

Note also that there's no mention of acpi_perf0 attaching in the dmesg, 
where I'm used to seeing that listed (eg as with my P3-Mobile CPU)

cheers, Ian

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