essary high power consumption (for example, processes that are mainly responsible for
waking up a processor from its idle state) and to optimize your system settings to avoid
these. It supports both Intel and AMD processors. For detailed information, refer to the
powerTOP project page at http://www.lesswatts.org/projects/
powertop/.
Apart from the tools above, the following ACPI utilities is available:
• To merely display information, like the battery charge level and the temperature, you
can use the acpi command. For a list of available options, run acpi --help.
•
For editing the ACPI tables in the BIOS, install the acpica package.
19.2.3 Troubleshooting
There are two different types of problems. On one hand, the ACPI code of the kernel
may contain bugs that were not detected in time. In this case, a solution will be made
available for download. More often, the problems are caused by the BIOS. Sometimes,
deviations from the ACPI specication are purposely integrated in the BIOS to circum-
vent errors in the ACPI implementation of other widespread operating systems. Hardware
components that have serious errors in the ACPI implementation are recorded in a
blacklist that prevents the Linux kernel from using ACPI for these components.
The rst thing to do when problems are encountered is to update the BIOS. If the
computer does not boot at all, one of the following boot parameters may be helpful:
pci=noacpi
Do not use ACPI for conguring the PCI devices.
acpi=ht
Only perform a simple resource conguration. Do not use ACPI for other purposes.
acpi=off
Disable ACPI.
354 Reference
