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Phenom II X6 1055T Ubuntu 10.10 does not recognize all cores.

post #1 of 4
Thread Starter 
Hi all, my first time posting on this board. I would appreciate anyones help or any hints I might get to resolve this issue. The issue is that Ubuntu 10.10 and 10.04 do not recognize more than 1 core on the Phenom II. It does recognize the 64bit arch, but not any of the additional cores. The BIOS shows that the cores are recognized. I am running 1702 BIOS from ASUS, latest as far as I know. The funny thing is that when I installed 10.04 System Monitor was showing all of cores, but after some upgrades or installation of some libraries, don't know which, System Monitor only shows 1 core. Here is the output of /proc/cpuinfo:
+++++++++++++++++++++++++++++++++
processor: 0
vendor_id: AuthenticAMD
cpu family: 16
model: 10
model name: AMD Phenom(tm) II X6 1055T Processor
stepping: 0
cpu MHz: 800.000
cache size: 512 KB
physical id: 0
siblings: 1
core id: 0
cpu cores: 1
apicid: 0
initial apicid: 0
fpu: yes
fpu_exception: yes
cpuid level: 6
wp: yes
flags: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt pdpe1gb rdtscp lm 3dnowext 3dnow constant_tsc up rep_good nonstop_tsc extd_apicid aperfmperf pni monitor cx16 popcnt lahf_lm cmp_legacy svm extapic cr8_legacy abm sse4a misalignsse 3dnowprefetch osvw ibs skinit wdt cpb npt lbrv svm_lock nrip_save
bogomips: 5625.25
TLB size: 1024 4K pages
clflush size: 64
cache_alignment: 64
address sizes: 48 bits physical, 48 bits virtual
power management: ts ttp tm stc 100mhzsteps hwpstate [9]
+++++++++++++++++++++++++++++++++

My current build is as follows:
ASUS M4A88TD-V EVO/USB3,
Phenoum II X6 1055T,
Kingston HyperX 8GB (2GBx4)
SSD 90 GB and 1 TB Raid 0

Ubuntu details: 10.10 Maverick release.
uname -a reports:
Linux ubu-amd64 2.6.35-28-generic #50-Ubuntu SMP Fri Mar 18 18:42:20 UTC 2011 x86_64 GNU/Linux

I am contemplating changing some Linux boot startup options but thought I would throw the question out first about the BIOS and such, before embarking on making changes to the OS.

thanks in advance,
J
post #2 of 4
that wouldnt be a problem with linux itself... i assume it might be a power saving function by turning off two cores as your core speed is also 800mhz check your bios settings, or try stressing it them look

the linux kernel basically supports brand spanking new cpu's as soon as they are released
Kinda meh now...
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Kinda meh now...
(13 items)
 
  
CPUMotherboardGraphicsRAM
PhII 940 BE asus M4N82 Deluxe 2x 8800gts(g92) 2x 1g ocz ddr2 1066 
Hard DriveOptical DriveOSMonitor
/dev/sd[abc] /dev/sr0 WinXP/Linux 22in acer 
PowerCaseMouseMouse Pad
950w rosewill timebomb Antec 900 (2small) Voodoo Deathadder (RED!) X-Trac Pads Ripper XL 
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post #3 of 4
Looks like you most likely have SMP disabled in the BIOS.
Underground
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Underground
(14 items)
 
  
CPUMotherboardGraphicsRAM
Core i7 920 C0 ASUS P6T6 WS Revolution GTX 460 TR3X6G1600C8D 
Hard DriveOptical DriveCoolingOS
WD1001FALS SAMSUNG SH-S223F 22X DVD MULTI Corsair H50 Fedora 16 KDE x86_64 
MonitorKeyboardPowerCase
HP w19b Microsoft Comfort Curve Corsair CX600 Thermaltake Armor VA8003BWS 
MouseMouse Pad
Razer DeathAdder Black 
  hide details  
Reply
post #4 of 4
Thread Starter 
Thanks all for your suggestions and replies. I have been looking for a fix for this since I installed Linux 10.04 LTS more than a week ago. Thankfully I had other items to keep me busy while researching this. I am using the quick reply post so that I can let everyone know that I resolved the issue yesterday. But, I just figured it out yesterday as soon as I posted the initial message. It has to do with the BIOS settings, but not the SMP. As I read in other forums, it seems APCI is the root cause of most of these issues. I will detail my fix, which could be different that others, since ACPI may or may not be a requirement for their needs.

regards,
J
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Overclock.net › Forums › Software, Programming and Coding › Operating Systems › Linux, Unix › Phenom II X6 1055T Ubuntu 10.10 does not recognize all cores.