2.4.22 has CONFIG_ACPI_RELAXED_AML to tell ACPI to ignore a common AML bug. 
(ie. be bug compatible with Microsoft's AML interpreter). 
 
This option is absent, but needed, in 2.6: 
 
boot a T40: 
 
Executing all Device _STA and_INI methods:...................................... 
................ exfldio-0129 [22] ex_setup_region       : Field [PWKI] access w 
idth (4 bytes) too large for region [U7CS] (length 2) 
 exfldio-0140 [22] ex_setup_region       : Field [PWKI] Base+Offset+Width 0+0+4 
is beyond end of region [U7CS] (length 2) 
 exfldio-0129 [22] ex_setup_region       : Field [PWKI] access width (4 bytes) t 
oo large for region [U7CS] (length 2) 
 exfldio-0140 [22] ex_setup_region       : Field [PWKI] Base+Offset+Width 0+0+4 
is beyond end of region [U7CS] (length 2) 
 psparse-1121: *** Error: Method execution failed [\_SB_.PCI0.USB7._INI] (Node d 
fd99aa8), AE_AML_REGION_LIMIT 
  nsinit-0397 [06] ns_init_one_device    : \_SB_.PCI0.USB7._INI failed: AE_AML_R 
EGION_LIMIT 
....