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What are the known issues when setting GRUB to boot with noapic? How does the setting affect the system or programs in it?

This quick answer explains what noapic does, but is there some example situations?

This question is connected to this problem: Unable to install/boot 11.04 on a ThinkPad L520.

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FYI on this (Thinkpad/Ubuntu) I have found that using "noapic" on Ubuntu 12.04 (64-bit) on a Lenovo Thinkpad L420 (Intel Core-i5-2520M) is the only way to get suspend/hibernate/shutdown working in all ways (FN buttons or pm-suspend, etc.). Works perfectly (so far) with VirtualBox running. I haven't noticed degradation yet. I would be nice for a detailed explanation of "noapic" :).

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Varies from system-to-system. Some reports of USB issues have been made.

Have you tried booting with apic=debug and posting the logs and dmesg output etc?

Upgrading the BIOS might provide a fix to the issue that causes apic to fail for you too.

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