Only 1 cpu core detected i7-2720QM LMDE 64 [Solved]

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Only 1 cpu core detected i7-2720QM LMDE 64 [Solved]

Postby vetus on Tue Jan 17, 2012 3:40 am

Please can anyone assist me I have Linux Mint Debian Edition 64 bit Katya installed on a Dell XPS 17 L702X and the OS seems to only detect 1 of the 8 cpu cores of my i7-2720QM.
Ive searched google and both the debian and mint forums and can't find much help with the issue.

I have ubuntu, backtrack, and arch installed on separate partitions and they all report 8 cpu cores correctly.
If there is any other information required please ask, if anyone knows of an answer please post a link.

Code: Select all
$ cat /proc/cpuinfo
processor   : 0
vendor_id   : GenuineIntel
cpu family   : 6
model      : 42
model name   : Intel(R) Core(TM) i7-2720QM CPU @ 2.20GHz
stepping   : 7
cpu MHz      : 800.000
cache size   : 6144 KB
physical id   : 0
siblings   : 1
core id      : 0
cpu cores   : 1
apicid      : 0
initial apicid   : 0
fpu      : yes
fpu_exception   : yes
cpuid level   : 13
wp      : yes
flags      : fpu vme de pse tsc msr pae mce cx8 sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx rdtscp lm constant_tsc up arch_perfmon pebs bts nopl xtopology nonstop_tsc aperfmperf pni pclmulqdq dtes64 monitor ds_cpl vmx smx est tm2 ssse3 cx16 xtpr pdcm sse4_1 sse4_2 x2apic popcnt aes xsave avx lahf_lm ida arat epb xsaveopt pln pts dts tpr_shadow vnmi flexpriority ept vpid
bogomips   : 4390.37
clflush size   : 64
cache_alignment   : 64
address sizes   : 36 bits physical, 48 bits virtual
power management:



Code: Select all
$ inxi -C
CPU:       Single core Intel Core i7-2720QM (-UP-) cache 6144 KB flags (lm nx sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx) clocked at 800.00 MHz



Code: Select all
$ uname -a
Linux vetus-katya 3.0.0-1-amd64 #1 SMP Sun Jul 24 02:24:44 UTC 2011 x86_64 GNU/Linux
Last edited by vetus on Tue Jan 17, 2012 1:28 pm, edited 1 time in total.
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Re: Only 1 cpu core detected i7-2720QM LMDE 64 Dell XPS 17 L

Postby xenopeek on Tue Jan 17, 2012 10:30 am

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Re: Only 1 cpu core detected i7-2720QM LMDE 64 Dell XPS 17 L

Postby vetus on Tue Jan 17, 2012 1:00 pm

This post got me pointed in the right direction.
http://forums.debian.net/viewtopic.php?f=5&t=65798

My problem was caused by having the nolapic in my GRUB_CMDLINE_LINUX_DEFAULT
Removed it updated-grub and all 8 cores are back.

This post by zerozero is also a must read.
http://forums.linuxmint.com/viewtopic.php?f=197&t=91405
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