Comment 75 for bug 1093217

I just tried applying Tom's workaround. Unfortunately, it seems to have no effect on my boot time.

Further information:
I'm running Ubuntu 12.04 on a Lenovo Z580
Decompiling DSDT works fine.
I made the modification no problem.
When I recompiled, I got some warning messages, I'll attach the output from that below.
running "acpi /boot/DSDT.aml" does not give error messages (or return anything for that matter)
booting linux then takes about 17 minutes

I'd love to hear if anybody has other suggestions.
I'm happy to provide any additional information.
Thanks.

Intel ACPI Component Architecture
ASL Optimizing Compiler version 20100528 [Oct 15 2010]
Copyright (c) 2000 - 2010 Intel Corporation
Supports ACPI Specification Revision 4.0a

DSDT.dsl 5011: Name (_T_0, Zero)
Remark 5111 - Use of compiler reserved name ^ (_T_0)

DSDT.dsl 5094: Name (_T_0, Zero)
Remark 5111 - Use of compiler reserved name ^ (_T_0)

DSDT.dsl 5177: Name (_T_0, Zero)
Remark 5111 - Use of compiler reserved name ^ (_T_0)

DSDT.dsl 5260: Name (_T_0, Zero)
Remark 5111 - Use of compiler reserved name ^ (_T_0)

DSDT.dsl 5511: Name (_T_0, Zero)
Remark 5111 - Use of compiler reserved name ^ (_T_0)

DSDT.dsl 5594: Name (_T_0, Zero)
Remark 5111 - Use of compiler reserved name ^ (_T_0)

DSDT.dsl 7351: Name (_T_1, Zero)
Remark 5111 - ^ Use of compiler reserved name (_T_1)

DSDT.dsl 7352: Name (_T_0, Zero)
Remark 5111 - ^ Use of compiler reserved name (_T_0)

DSDT.dsl 11008: Name (_T_0, Zero)
Remark 5111 - ^ Use of compiler reserved name (_T_0)

DSDT.dsl 11068: Name (_T_6, Zero)
Remark 5111 - ^ Use of compiler reserved name (_T_6)

DSDT.dsl 11069: Name (_T_5, Zero)
Remark 5111 - ^ Use of compiler reserved name (_T_5)

DSDT.dsl 11070: Name (_T_4, Zero)
Remark 5111 - ^ Use of compiler reserved name (_T_4)

DSDT.dsl 11071: Name (_T_3, Zero)
Remark 5111 - ^ Use of compiler reserved name (_T_3)

DSDT.dsl 11072: Name (_T_2, Zero)
Remark 5111 - ^ Use of compiler reserved name (_T_2)

DSDT.dsl 11073: Name (_T_1, Zero)
Remark 5111 - ^ Use of compiler reserved name (_T_1)

DSDT.dsl 11074: Name (_T_0, Zero)
Remark 5111 - ^ Use of compiler reserved name (_T_0)

DSDT.dsl 11389: Name (_T_0, Zero)
Remark 5111 - ^ Use of compiler reserved name (_T_0)

DSDT.dsl 11561: Name (_VPC, Zero)
Warning 1099 - ^ Unknown reserved name (_VPC)

DSDT.dsl 11585: Method (_CFG, 0, NotSerialized)
Warning 1099 - Unknown reserved name ^ (_CFG)

DSDT.dsl 11585: Method (_CFG, 0, NotSerialized)
Warning 1099 - Unknown reserved name ^ (_CFG)

DSDT.dsl 11626: Name (_T_0, Zero)
Remark 5111 - ^ Use of compiler reserved name (_T_0)

DSDT.dsl 11689: Name (_T_0, Zero)
Remark 5111 - ^ Use of compiler reserved name (_T_0)

DSDT.dsl 11888: Name (_T_0, Zero)
Remark 5111 - ^ Use of compiler reserved name (_T_0)

ASL Input: DSDT.dsl - 12106 lines, 373929 bytes, 4769 keywords
AML Output: DSDT.aml - 44354 bytes, 1334 named objects, 3435 executable opcodes

Compilation complete. 0 Errors, 3 Warnings, 20 Remarks, 29 Optimizations