Comment 64 for bug 355155
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| Sir Romanov (romain-couillet) wrote Re: Computer hard locks randomly with ubuntu jaunty | #64 |
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1b1ed1a
(Get the code!)
EDIT: "acpi=off" led to a stall also... But appending "noapic nolapic acpi=off" to the GRUB menu led to (up to now) no stalling... video playback, ethernet connected for already 12 hours, no problem.
Can you guys try and confirm this is a workaround?
For what I understand, LAPIC uses its own clock set on the CPU's frequency to handle interrupts. When you disable it, you might get rid off some synchronisation issues. However, it is said often to make the ACPI Power Management unstable; so better use "acpi=off" also.
The problem now is that there is no longer any CPU frequency scaling (since ACPI is discarded, the kernel cannot control the CPU frequency) and then the computer is running full speed... which on a laptop would quickly exhaust the battery and keep the CPU hot (unless on the contrary this sets the CPU to lowest frequency... how can I know that? maybe even not both cores are used...)! Does anyone have further information on that? What would be the default setting?