I'm using Ubuntu 14.04.2 LTS with kernel 3.16.0-38-generic #52~14.04.1-Ubuntu SMP Fri May 8 09:43:57 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux.
Computer model: iMac Late 2009 ( https://support.apple.com/kb/SP696?locale=en_US )
My computer is EFI based (not BIOS). And I don't see "noapic, nolapic" set in the grub config file.
I have an Intel(R) Core(TM)2 Duo CPU, but some times when I boot my system only 1 CPU core is detected.
Here's dmesg output when only core is detected:
[ 0.000000] smpboot: Allowing 2 CPUs, 0 hotplug CPUs
[ 0.073437] smpboot: CPU0: Intel(R) Core(TM)2 Duo CPU E7600 @ 3.06GHz (fam: 06, model: 17, stepping: 0a)
[ 5.088430] smpboot: CPU1: Not responding
[ 5.088440] smpboot: do_boot_cpu failed(1) to wakeup CPU#1
[ 5.088448] smpboot: Total of 1 processors activated (6102.83 BogoMIPS)
[ 0.076000] Kernel panic - not syncing: smp_callin: CPU1 started up but did not get a callout!
[ 0.076000] ---[ end Kernel panic - not syncing: smp_callin: CPU1 started up but did not get a callout!
Here's dmesg output when all of the cores are detected:
[ 0.000000] smpboot: Allowing 2 CPUs, 0 hotplug CPUs
[ 0.073319] smpboot: CPU0: Intel(R) Core(TM)2 Duo CPU E7600 @ 3.06GHz (fam: 06, model: 17, stepping: 0a)
[ 0.086922] smpboot: Total of 2 processors activated (12206.00 BogoMIPS)
USB devices:
$ lsusb
Bus 002 Device 004: ID 05ac:8403 Apple, Inc. Internal Memory Card Reader
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 004 Device 003: ID 045e:078c Microsoft Corp.
Bus 004 Device 004: ID 05ac:8215 Apple, Inc. Built-in Bluetooth 2.0+EDR HCI
Bus 004 Device 002: ID 0a5c:4500 Broadcom Corp. BCM2046B1 USB 2.0 Hub (part of BCM2046 Bluetooth)
Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 001 Device 003: ID 05ac:8502 Apple, Inc. Built-in iSight
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 003 Device 003: ID 05ac:8242 Apple, Inc. Built-in IR Receiver
Bus 003 Device 002: ID 045e:0040 Microsoft Corp. Wheel Mouse Optical
Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
I only have a Microsoft old keyboard and mouse plugged (2 of 4 usb ports used).
What can I do to sort this out?
Thanks.
nproc
in that system? If 2 then it is all fine, I guess.