clock drifts after upgrade from 5.x to 6.x

[Alfred Morgan]

   I have upgraded 4 different machines from various FreeBSD versions of
   5 to various versions of 6 and 3 of the machines has a problem where
   the clock will drift very quickly slowing about 2 seconds per minute.
   These are the machines with dmesg | grep time: (specs from
   [1]www.hp.com)
   *(no drift) HP pavilion a510n (Via KM400A, ASUS A7V8X-LA)
   Timecounter "i8254" frequency 1193182 Hz quality 0
   Timecounter "ACPI-fast" frequency 3579545 Hz quality 1000
   acpi_timer0: <24-bit timer at 3.579545MHz> port 0x4008-0x400b on acpi0
   pmtimer0 on isa0
   Timecounter "TSC" frequency 2100094312 Hz quality 800
   Timecounters tick every 1.000 msec
   *(bad drift) HP pavilion a510n (Via KM400A, ASUS A7V8X-LA)
   Timecounter "i8254" frequency 1193182 Hz quality 0
   pci0: <multimedia, audio> at device 17.5 (no driver attached)
   pmtimer0 on isa0
   Timecounter "TSC" frequency 2100088469 Hz quality 800
   Timecounters tick every 1.000 msec
   *(bad drift) Compaq Presario SR1230NX (Via KM400A, A7V8Z-LA)
   *(bad drift) Compaq Presario S6500NX (Via KM400, ASUS A7V8X-LA)
   Timecounter "TSC" frequency 2158040786 Hz quality 800
   Timecounters tick every 1.000 msec
   Timecounter "i8254" frequency 1193182 Hz quality 0
   The one computer that did work (the first HP pavilion a510n) seems to
   be the only one with ACPI enabled.
   -alfred

References

   1. http://www.hp.com/