> I thought I fixed this in 4.0 but I guess I was wrong.
> On some newer *Books we accidentally power down when the adb driver  
> attaches. As far as I know this happens on machines which don't have  
> an ADB bus, so the PMU regards ADB commands as error and powers down.  
> The attached patch will prevent the adb driver from issuing any ADB  
> commands when the pmu node doesn't have an adb child. I've tested it  
> on a PowerMac G4 which doesn't have ADB but the PMU is similar enough  
> to the one used in newer PowerBooks although it doesn't power down on  
> every error and a PowerBook 3400c which does have ADB. On the G4 no  
> ADB commands are issued ( usually there would be a timeout message )  
> and on the PowerBook the normal ADB devices attach.
> 
> Please test this on machines with or without ADB, if it fixes the  
> power down problem and doesn't have any funny side effects I'll  
> request pullup into 4.0

Do you have a test kernel with the patch incorporated?

BTW, my PowerBook G4 12" powered down when I hitted f2 key
twice or more with the kernel 3.99.x or earlier, but 4.99.31
works fine.  Not tested 4.0.x.

My machine is:
  PowerBook6,4 (late 2004)
  166.402MHz

Regards,

--
SUNAGAWA Keiki <kei_sun@ba2.so-net.ne.jp>