Wednesday, 11 February 2015

iMac14,2 Unable to use all Processors topic






Ubuntu version: 14.10 (upgraded from 14.04)

Unable to boot without nolapic option, which leaves me with only 1 cpu. Machine is horribly slow, for serious tasks this is no good.

lshw says CPU is: Intel(R) Core(TM) i5-4570 CPU @ 3.20GHz

The strange thing is, it has worked with all 4 cores, and worked really well. After upgrading to 14.10 it was all fine, all cores working, booting up fine. Then 1 day it wouldn't boot, and I have to resort to nolapic. Another time it did boot up fine with all cores, but now for at least a month it never will.

I install regular updates etc.

Can anyone help me to get those processors working?






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