Messages in this thread |  | | Date | Mon, 16 Sep 2002 03:28:53 +0200 (MET DST) | From | Mikael Pettersson <> | Subject | Re: turning off APIC |
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On Sun, 15 Sep 2002 14:28:44 +0300, Andriy Rysin wrote: >If APIC is compiled in the kernel (wich is the case with most >distributions) when I start kernel with "noapic" option, APIC is getting >enabled anyway and only later gets disabled. This causes problems on >some VAIO notebooks - it seems like BIOS gets confused if APIC was >turned on (particularly on my laptop when I try to reboot from Linux it >hangs saying that thera problems with keyboard). That would be much >better to have an option to turn it off in the boot options and not to >recompile the kernel. Could somebody comment this please? >Please CC me on this email address.
Which APIC? local or I/O? Please be specific. "noapic" does not and never has had anything to do with the local APIC, only the I/O APIC. There is currently no kernel option for preventing the local APIC from being enabled if the kernel was built with local APIC support.
You have four options: 1. Recompile with CONFIG_SMP=n and CONFIG_X86_LOCAL_APIC=n. 2. Run dmidecode on your Vaio, dig out the identification strings, and add them to arch/i386/kernel/dmi_scan.c's local APIC blacklist. 3. Add a __setup in arch/i386/kernel/apic.c after the declaration for dont_enable_local_apic, which sets it to 1. 4. Tell Sony to fix the Vaio's BIOS.
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