Some more info about cpu_idle: "In my gsoc proposal, I mentioned the local APIC timer issue--APIC timers may be shutdown when entering deeper C-States. For intel CPUs, this issue will only happen after we adds the so called cpuidle support. But for AMD CPUs, I think we already have this problem. Please refer to http://dev.haiku-os.org/ticket/8111 for details. But I'm not sure whether the root cause of #8111 is the APIC issue." "The real fix should be switch to another reliable timer before hlt instruction. But this need more haiku timer subsystem changes. I put this into goal after gsoc." /Fredrik Holmqvist, TQH  //www.freelists.org/post/haiku-development/patch-x86-AMD-C1E-with-no-ARATAlways-Running-APIC-Timer-idle-support,1 2013/4/29 Jessica Hamilton <jessica.l.hamilton@xxxxxxxxx>: > The intel_extreme driver is at fault in terms of booting any further. I > removed it and can now boot Haiku fine on my new IvyBridge. I can give you > an updated syslog if it's helpful for this cpuidle stuff, or any further > testing you need done. I got it purposefully for Haiku dev afterall... > > > On 29 April 2013 22:07, Ingo Weinhold <ingo_weinhold@xxxxxx> wrote: >> >> ingo_weinhold@xxxxxx wrote: >> >> Just in case anyone is interested ... >> >> > a83983a: acpi_cpuidle: Fix driver initialization >> > >> > * For some reason the code in acpi_processor_init() assumed that the >> > CPU index returned by ACPI was 1-based. On my machines it is 0-based >> > and the syslogs on Trac from the last months don't show any >> > exception. The code even contained a hack to force satisifying that >> > assumption for a single-CPU machine. >> >> I just saw a new syslog that shows 1-based indexing , apparently on an >> IvyBridge system. >> >> > 31bc74d: Remove x86_cpuidle driver from image >> > >> > Apparently it isn't ready yet. I haven't found a single syslog on Trac >> > that shows a successful initialization of the driver, and on my >> > machine, where it does that at least, the system freezes during boot. >> >> ... and it even reports successful initialization. Since Haiku doesn't >> seem to boot much farther, it's hard to say whether the driver actually >> works on this system, though. >> >> CU, Ingo >> >>  http://dev.haiku-os.org/attachment/ticket/9718/syslog.txt >> > -- Fredrik Holmqvist Chaordic: things that thrive on the edge of chaos with just enough order to give them pattern, but not so much to slow their adaptation and learning.