Kernel 1917 x86_64 acpi Errors

[Partha Bagchi]

I am finally able to boot a kernel beyond 1884. The only way to boot is 
to use acpi=off. Here are the errors that I could write down (only 
partially, since they are more of the same) if booted without acpi=off

<ffffffff8023c09b>{acpi_ut_execute_STA+31}{ffffffff8023e204}{acpi_ut_release_mutex+100}
<ffffffff8023556b>{acpi_ns_get_device_callback+105}
<ffffffff80205cd3>{vsscanf+1467}{acpi_os+wait_semaphore+118}
....
<some error with spinlock>


Needless to say, no acpi.

Here are some details:
uname -a:
Linux  2.6.15-1.1917_FC5 #1 SMP Tue Feb 7 20:38:34 EST 2006 x86_64 
x86_64 x86_64 GNU/Linux

Hardware: HP dv8000 with AMD 64 Turion