forked from http://bugzilla.kernel.org/show_bug.cgi?id=3927 per Andi Kleen's
Most recent kernel where this bug did not occur: none
Hardware Environment: Athlon64 3200+ MSI RS482M4 (Ati rs482 and sb450)
Software Environment: bash/date
Problem Description: the timer runs twice as fast as expected, looking at your
watch and running date for two consecutive seconds produces a time difference
of two seconds instead of only one.
Steps to reproduce: boot kernel without noapic, login, run date with one second
intervals. Watch it report dates with 2 second intervals.
Workaround: boot with noapic
The previous situation is with ACPI disabled in BIOS. If I enable ACPI in BIOS
and try to boot 18.104.22.168 without noapic then I get the following kernel panic:
not syncing: VFS: Unable to mount root fs on unknown-block(0,0)
I've checked back to version 2.6.12 but none completely boot with ACPI enabled.
I was able to get ACPI working (see
http://bugzilla.kernel.org/show_bug.cgi?id=6522) and this has allowed me to
remove the noapic option without getting a double speed timer.