kernel panic in atapicam modul if acpi is enabled

[Oliver B. Fischer]

Dear list,

if have got a ThinkPad R51 with an internal DVDR (acd0: DVDR 
<MATSHITADVD-RAM UJ-811> at ata1-master PIO4). If I compile the kernel 
with atapicam modul enabled I can only boot without an panic if disabled 
ACPI at boot time.

The message is:

kernel type 12 trap
stoppend at xpt_find_device...

Is this an ACPI issue or not?

Regards,

Oliver Fischer