DragonFlyBSD

:After a fresh install of 1.8.1-RELEASE on a system with ASUS P5A-B
:mainboard (ALI chipset), the clock runs twice as fast as normal.
:
:Booting with ACPI disabled solved this problem.
:
:
:The clock problem on some ATI chipsets was a problem in Linux some
:kernels ago too. The solution was triggered by clock=pit as bootarg if I
:remember right... maybe having a peek into Linux's code helps.

Could you post the full dmesg output with and without ACPI enabled?

-Matt
                    Matthew Dillon 
                    <dillon@backplane.com>

2 files attached.

:2 files attached.

Hmm.  That's odd.  Boot with ACPI and do this:

sysctl kern.cputimer

I'm guessing it is using the ACPI timer, but I don't know why it would
    be running so fast.

You can disable the use of the ACPI timer without disabling ACPI itself
    by putting this in your /boot/loader.conf file:

debug.acpi.disable=timer

-Matt

Small correction: it's "debug.acpi.disabled" :)

Sascha

1. sysctl kern.cputimer
   kern.cputimer.select: ACPI-safe i8254_timer2 dummy
   kern.cputimer.name: ACPI-safe
   kern.cputimer.clock: 1215945362
   kern.cputimer.freq: 3579545

Ok.

1. sysctl kern.cputimer
   kern.cputimer.select: i8254_timer2 dummy
   kern.cputimer.name: i8254_timer2
   kern.cputimer.clock: 108355686
   kern.cputimer.freq: 1193182

sleep 5 now is 5 reallife seconds...

New dmesg output attached.

dding the debug.acpi.disabled="hpet timer" fixes the timer issue.