Tuesday, December 28, 2010

Linux ACPI issue


In a previous post, I had a temporary solution for the ACPI issue of the kernel on my machine. It worked but the machine hesitated all the time. Recently, I played with the kernel parameters related to the ACPI and got some interesting results.

1. Use the option acpi=off. The auto shutdown problem was gone, but the system became sluggish.

2. Use the option acpi=ht. The result was same as acpi=off.

3. Use the options pci=noacpi acpi=noirq pnpacpi=off noapic nolapic. This basically turned off most of the ACPI functions, but not as many as acpi=ht. The auto shutdown problem was gone, and the system worked well. However, only one CPU was recognized.

4. Use the options pci=noacpi acpi=noirq pnpacpi=off. The auto shutdown problem came back.

5. Use the options noapic nolapic. The auto shutdown problem was gone, and the system worked well. However, only one CPU was recognized.

6. Use the options noapic. The auto shutdown problem was gone, and the system worked well. Both CPU's were recognized. This one seemed to be the best solution.

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