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Monitor the boot messages of the system with the command dmesg | grep -2i
acpi (or all messages, because the problem may not be caused by ACPI) after booting.
If an error occurs while parsing an ACPI table, the most important table—the DS-
DT—can be replaced with an improved version. In this case, the faulty DSDT of the
BIOS is ignored. The procedure is described in
(page 555).
In the kernel configuration, there is a switch for activating ACPI debug messages. If a
kernel with ACPI debugging is compiled and installed, experts searching for an error
can be supported with detailed information.
If you experience BIOS or hardware problems, it is always advisable to contact the
manufacturers. Especially if they do not always provide assistance for Linux, they
should be confronted with the problems. Manufacturers will only take the issue seriously
if they realize that an adequate number of their customers use Linux.
For More Information
Additional documentation and help on ACPI:
•
http://www.cpqlinux.com/acpi-howto.html
contains DSDT patches)
•
http://www.intel.com/technology/iapc/acpi/faq.htm
FAQ @Intel)
•
http://acpi.sourceforge.net/
•
http://www.poupinou.org/acpi/
28.4 Rest for the Hard Disk
In Linux, the hard disk can be put to sleep entirely if it is not needed or it can be run in
a more economic or quieter mode. On modern laptops, you do not need to switch off
the hard disks manually, because they automatically enter an economic operating mode
whenever they are not needed. However, if you want to maximize power savings, test
some of the following methods. Most of the functions can be controlled with powersaved
and the YaST power management module, which is discussed in further detail in
tion 28.6, "The YaST Power Management Module"
Section 28.5.4, "Troubleshooting"
(detailed ACPI HOWTO,
(the ACPI4Linux project at Sourceforge)
(DSDT patches by Bruno Ducrot)
(page 557).
(ACPI
Sec-
Power Management
547
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Table of Contents
Troubleshooting
