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[Launchpad Bug Tracker <593427@xxxxxxxxxxxxxxxxxx>]

[Expired for linux (Ubuntu) because there has been no activity for 60
days.]

** Changed in: linux (Ubuntu)
       Status: Incomplete => Expired

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https://bugs.launchpad.net/bugs/593427

Title:
  CPU only uses one of two cores (Intel E6600)

Status in “linux” package in Ubuntu:
  Expired

Bug description:
  I have this problem only since i installed Ubuntu 10.04(all previous
  versions worked). I use a Gigabyte GA-G31MX-S2 motherboard with a
  Intel E6600 CPU(core2duo). Both CPU cores work on other OS's and using
  live cd's of previous ubuntu releases. I have Kernel version 2.6.32-21
  and 2.6.32-22(both has this problem) I checked ACPI(no options in BIOS
  but in POST it sais ACPI controller [OK]).  Here is some related info
  from the terminal

  martin@martin-desktop:~$ cat /proc/cpuinfo
  processor	: 0
  vendor_id	: GenuineIntel
  cpu family	: 6
  model		: 15
  model name	: Intel(R) Core(TM)2 CPU          6600  @ 2.40GHz
  stepping	: 6
  cpu MHz		: 2474.594
  cache size	: 4096 KB
  physical id	: 0
  siblings	: 1
  core id		: 0
  cpu cores	: 1
  apicid		: 0
  initial apicid	: 0
  fpu		: yes
  fpu_exception	: yes
  cpuid level	: 10
  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 lm constant_tsc arch_perfmon pebs bts rep_good aperfmperf pni dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr pdcm lahf_lm tpr_shadow
  bogomips	: 4949.18
  clflush size	: 64
  cache_alignment	: 64
  address sizes	: 36 bits physical, 48 bits virtual
  power management:

  martin@martin-desktop:~$ hwinfo --cpu
  01: None 00.0: 10103 CPU                                        
    [Created at cpu.304]
    Unique ID: rdCR.j8NaKXDZtZ6
    Hardware Class: cpu
    Arch: X86-64
    Vendor: "GenuineIntel"
    Model: 6.15.6 "Intel(R) Core(TM)2 CPU          6600  @ 2.40GHz"
    Features: 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,lm,constant_tsc,arch_perfmon,pebs,bts,rep_good,aperfmperf,pni,dtes64,monitor,ds_cpl,vmx,est,tm2,ssse3,cx16,xtpr,pdcm,lahf_lm,tpr_
    Clock: 2475 MHz
    BogoMips: 4949.18
    Cache: 4096 kb
    Units/Processor: 2
    Config Status: cfg=new, avail=yes, need=no, active=unknown
  martin@martin-desktop:~$ ^C
  martin@martin-desktop:~$ ls -l /sys/devices/system/cpu/
  total 0
  drwxr-xr-x 4 root root    0 2010-06-13 20:12 cpu0
  drwxr-xr-x 2 root root    0 2010-06-13 20:13 cpufreq
  drwxr-xr-x 2 root root    0 2010-06-13 20:13 cpuidle
  -r--r--r-- 1 root root 4096 2010-06-13 21:17 kernel_max
  -r--r--r-- 1 root root 4096 2010-06-13 21:17 offline
  -r--r--r-- 1 root root 4096 2010-06-13 21:17 online
  drwxr-xr-x 2 root root    0 2010-06-13 21:17 perf_events
  -r--r--r-- 1 root root 4096 2010-06-13 21:17 possible
  -r--r--r-- 1 root root 4096 2010-06-13 21:17 present
  -rw-r--r-- 1 root root 4096 2010-06-13 21:17 sched_mc_power_savings
  martin@martin-desktop:~$ uname -a
  Linux martin-desktop 2.6.32-22-generic #36-Ubuntu SMP Thu Jun 3 19:31:57 UTC 2010 x86_64 GNU/Linux
  martin@martin-desktop:~$ lsb_release -rd
  Description:	Ubuntu 10.04 LTS
  Release:	10.04
  martin@martin-desktop:~$ sudo lspci
  [sudo] password for martin: 
  00:00.0 Host bridge: Intel Corporation 82G33/G31/P35/P31 Express DRAM Controller (rev 02)
  00:01.0 PCI bridge: Intel Corporation 82G33/G31/P35/P31 Express PCI Express Root Port (rev 02)
  00:1b.0 Audio device: Intel Corporation N10/ICH 7 Family High Definition Audio Controller (rev 01)
  00:1c.0 PCI bridge: Intel Corporation N10/ICH 7 Family PCI Express Port 1 (rev 01)
  00:1d.0 USB Controller: Intel Corporation N10/ICH7 Family USB UHCI Controller #1 (rev 01)
  00:1d.1 USB Controller: Intel Corporation N10/ICH 7 Family USB UHCI Controller #2 (rev 01)
  00:1d.2 USB Controller: Intel Corporation N10/ICH 7 Family USB UHCI Controller #3 (rev 01)
  00:1d.3 USB Controller: Intel Corporation N10/ICH 7 Family USB UHCI Controller #4 (rev 01)
  00:1d.7 USB Controller: Intel Corporation N10/ICH 7 Family USB2 EHCI Controller (rev 01)
  00:1e.0 PCI bridge: Intel Corporation 82801 PCI Bridge (rev e1)
  00:1f.0 ISA bridge: Intel Corporation 82801GB/GR (ICH7 Family) LPC Interface Bridge (rev 01)
  00:1f.1 IDE interface: Intel Corporation 82801G (ICH7 Family) IDE Controller (rev 01)
  00:1f.2 IDE interface: Intel Corporation N10/ICH7 Family SATA IDE Controller (rev 01)
  00:1f.3 SMBus: Intel Corporation N10/ICH 7 Family SMBus Controller (rev 01)
  01:00.0 VGA compatible controller: nVidia Corporation G92 [GeForce 9800 GT] (rev a2)
  02:00.0 RAID bus controller: Silicon Image, Inc. SiI 3132 Serial ATA Raid II Controller (rev 01)
  03:01.0 SCSI storage controller: Adaptec AHA-2940U/UW/D / AIC-7881U
  03:05.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL-8110SC/8169SC Gigabit Ethernet (rev 10)

  ProblemType: Bug
  DistroRelease: Ubuntu 10.04
  Package: linux-image-2.6.32-22-generic 2.6.32-22.36
  Regression: Yes
  Reproducible: No
  ProcVersionSignature: Ubuntu 2.6.32-22.36-generic 2.6.32.11+drm33.2
  Uname: Linux 2.6.32-22-generic x86_64
  NonfreeKernelModules: nvidia
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.21.
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  martin     1761 F.... pulseaudio
   /dev/snd/pcmC0D0p:   martin     1761 F...m pulseaudio
   /dev/snd/controlC1:  martin     1761 F.... pulseaudio
  CRDA: Error: [Errno 2] No such file or directory
  Card0.Amixer.info:
   Card hw:0 'Intel'/'HDA Intel at 0xf8000000 irq 10'
     Mixer name	: 'Realtek ALC888'
     Components	: 'HDA:10ec0888,1458e601,00100001'
     Controls      : 40
     Simple ctrls  : 22
  Card1.Amixer.info:
   Card hw:1 'Pro'/'Creative Technology Ltd VF0410 Live! Cam Video IM Pro at usb-0000:00:1d.7-8.1, '
     Mixer name	: 'USB Mixer'
     Components	: 'USB041e:4063'
     Controls      : 2
     Simple ctrls  : 1
  Card1.Amixer.values:
   Simple mixer control 'Mic',0
     Capabilities: cvolume cvolume-joined cswitch cswitch-joined penum
     Capture channels: Mono
     Limits: Capture 0 - 3072
     Mono: Capture 0 [0%] [18.00dB] [on]
  CheckboxSubmission: ba8f476ec000274d522533f517786fef
  CheckboxSystem: fd6c484c0b5d20a2f1cd036ef0f63975
  Date: Sun Jun 13 22:46:42 2010
  Frequency: Once a day.
  HibernationDevice: RESUME=UUID=905719ae-7948-4c8d-b5a4-ac9c8cdf8acc
  InstallationMedia: Ubuntu 10.04 LTS "Lucid Lynx" - Release amd64 (20100429)
  IwConfig:
   lo        no wireless extensions.
   
   eth0      no wireless extensions.
   
   ppp0      no wireless extensions.
  MachineType: Gigabyte Technology Co., Ltd. G31MX-S2
  ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.32-22-generic root=UUID=f6153fb1-5966-4cbc-b063-c86ac824ee4f ro quiet splash acpi=off noapic nolapic
  ProcEnviron:
   LANG=en_ZA.utf8
   SHELL=/bin/bash
  RelatedPackageVersions: linux-firmware 1.34
  RfKill:
   
  SourcePackage: linux
  dmi.bios.date: 11/22/2007
  dmi.bios.vendor: Award Software International, Inc.
  dmi.bios.version: F4
  dmi.board.name: G31MX-S2
  dmi.board.vendor: Gigabyte Technology Co., Ltd.
  dmi.board.version: x.x
  dmi.chassis.type: 3
  dmi.chassis.vendor: Gigabyte Technology Co., Ltd.
  dmi.modalias: dmi:bvnAwardSoftwareInternational,Inc.:bvrF4:bd11/22/2007:svnGigabyteTechnologyCo.,Ltd.:pnG31MX-S2:pvr:rvnGigabyteTechnologyCo.,Ltd.:rnG31MX-S2:rvrx.x:cvnGigabyteTechnologyCo.,Ltd.:ct3:cvr:
  dmi.product.name: G31MX-S2
  dmi.sys.vendor: Gigabyte Technology Co., Ltd.

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