I have tried to set an upstream bug report - but bugzilla is still down after kernel.org got hacked.
The problem is in the CPU hotplug Support and there is no kernel parameters to prevent a cpu being classed as "hot pluggable" there should really be a mincpu's option or better a nohotplug="0,1,2,5,7,etc" option. It would appear that cpu1 is the default cpu for those interrupts - and they are not being transferred to cpu0 properly. I have tried the kernel parameters noapic nosmp maxcpus acpi=off possible_cpus=2 etc - with no success I did find a flaw in "possible_cpus=0" - this prevents the kernel booting (no cpus available ) This option should be set to a minimum of 1 I also tried to switch off acpi in the bios - no effect. the nosmp option still used SMP code It actually switched back to SMP code to offline cpu1 which kinda defeated the purpose of the option. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/875677 Title: Kernel Power management turnming off used devices that are in use. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/875677/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
