On Mon, 2006-08-14 at 19:45 +0200, Pierre Dinh-van wrote:
> Hi,
> 
> I'm using Ubuntu dapper on my Macbook 2GHz, in dual boot with mac os x using 
> rEFIt (no bootcamp).
> 
> I noticed that very often, the Macbook can't boot on my Linux kernel, 
> stopping 
> with a kernel panic :
> 
> (I copy manually the interesting lines)
> 
> "
> [...]
> Total of 2 processors activated (5825.50 BogoMIPS).
> ENABLING IO-APIC IRQs
> ..TIMER: vector=0x31 apic1=0 pin1=2 apic2=1 pin2=-1
> ..MP-BIOS bug: 8254 timer not connected to IO-APIC
> ...trying to set up timer (IRQ0) through the 8259A ... failed.
> ...trying to set up timer as Virtual Wire IRQ... failed.
> ...trying to set up timer as ExtINT IRQ... failed :(.
> Kernel panic - not syncing: IO-APIC + timer doesn't work! Boot with 
> apic=debug 
> and send a report. Then try booting with the 'noapic' option
> 
> "
> 
> It can happen while cold booting, while rebooting from macosX, while 
> rebooting 
> from GNU/Linux.
> 
> Booting with apic=debug doesn't change anything in the kernel output before 
> the panic.
> 
> I observed this problem with the ubuntu 2.6.15.26 and a manually compiled 
> 2.6.17.8.
> 
> Is someone having the same experience ?

Yes, this is a know problem. Unfortunately it is still there with the
current 2.6.18rc series, although less frequent.  Now I only see it
after a warm boot or a power off quickly followed by a power on.

Jurgen



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