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Old 04-11-2008, 11:32 PM   #1
getzburg
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Registered: Aug 2003
Posts: 7

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Core 2 Duo U7500, One Core MIA


I'm running Gentoo on a Sony Vaio VGN-TZ170N, with a Core 2 Duo U7500. Recently, one of the cores seems to have vanished. It previously appeared in cpuinfo, gkrellm showed it working, and cpufreq created the
appropriate entries for it in /sys. I was tipped off to its disappearance by one of my startup scripts throwing an error when its /sys entry no longer existed. I have made no changes to my kernel in a month or so
and no packages have been updated aside from openssh and a couple of libraries.

Output of /proc/cpuinfo:
Code:
processor       : 0
vendor_id       : GenuineIntel
cpu family      : 6
model           : 15
model name      : Intel(R) Core(TM)2 CPU         U7500  @ 1.06GHz
stepping        : 2
cpu MHz         : 1067.000
cache size      : 2048 KB
physical id     : 0
siblings        : 1
core id         : 0
cpu cores       : 1
fdiv_bug        : no
hlt_bug         : no
f00f_bug        : no
coma_bug        : no
fpu             : yes
fpu_exception   : yes
cpuid level     : 10
wp              : yes
flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe nx lm constant_tsc up arch_perfmon pebs bts pni monitor ds_cpl vmx est tm2
ssse3 cx16 xtpr lahf_lm
bogomips        : 2130.71
clflush size    : 64

I took a look at the output of dmesg and noticed this portion:
Code:
ACPI: BIOS bug: multiple APIC/MADT found, using 0
ACPI: If "acpi_apic_instance=2" works better, notify linux-acpi@vger.kernel.org
ACPI: DMI detected: Sony
ACPI: PM-Timer IO Port: 0x1008
ACPI: Local APIC address 0xfee00000
ACPI: LAPIC (acpi_id[0x00] lapic_id[0x00] enabled)
Processor #0 6:15 APIC version 20
ACPI: LAPIC (acpi_id[0x01] lapic_id[0x01] disabled)
ACPI: LAPIC_NMI (acpi_id[0x00] high edge lint[0x1])
ACPI: LAPIC_NMI (acpi_id[0x01] high edge lint[0x1])
I took that advice and added the parameter to my grub config.

New /proc/cpuinfo:
Code:
processor       : 0
vendor_id       : GenuineIntel
cpu family      : 6
model           : 15
model name      : Intel(R) Core(TM)2 CPU         U7500  @ 1.06GHz
stepping        : 2
cpu MHz         : 1067.000
cache size      : 2048 KB
physical id     : 0
siblings        : 2
core id         : 0
cpu cores       : 2
fdiv_bug        : no
hlt_bug         : no
f00f_bug        : no
coma_bug        : no
fpu             : yes
fpu_exception   : yes
cpuid level     : 10
wp              : yes
flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe nx lm constant_tsc arch_perfmon pebs bts pni monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr lahf_lm                     
bogomips        : 2130.72       
clflush size    : 64            
                                
processor       : 1             
vendor_id       : GenuineIntel  
cpu family      : 6             
model           : 15            
model name      : Intel(R) Core(TM)2 CPU         U7500  @ 1.06GHz
stepping        : 2             
cpu MHz         : 1064.038      
cache size      : 2048 KB       
physical id     : 0             
siblings        : 2             
core id         : 1             
cpu cores       : 2             
fdiv_bug        : no            
hlt_bug         : no            
f00f_bug        : no            
coma_bug        : no            
fpu             : yes           
fpu_exception   : yes           
cpuid level     : 10            
wp              : yes           
flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe nx lm constant_tsc arch_perfmon pebs bts pni monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr lahf_lm                     
bogomips        : 2128.08       
clflush size    : 64
New dmesg output:
Code:
ACPI: BIOS bug: multiple APIC/MADT found, using 2
ACPI: If "acpi_apic_instance=0" works better, notify linux-acpi@vger.kernel.org
ACPI: DMI detected: Sony
ACPI: PM-Timer IO Port: 0x1008
ACPI: Local APIC address 0xfee00000
ACPI: LAPIC (acpi_id[0x00] lapic_id[0x00] enabled)
Processor #0 6:15 APIC version 20
ACPI: LAPIC (acpi_id[0x01] lapic_id[0x01] enabled)
Processor #1 6:15 APIC version 20
ACPI: LAPIC_NMI (acpi_id[0x00] high edge lint[0x1])
ACPI: LAPIC_NMI (acpi_id[0x01] high edge lint[0x1])
The second core has reappeared, and the kernel seems to be utilizing it, but cpufreq still won't create /sys entries for it. I'm posting here because I'm starting to suspect this a hardware failure, but I'm hoping it's something I did and just can't remember / work it out.

Thoughts?
 
Old 04-12-2008, 10:06 PM   #2
getzburg
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Registered: Aug 2003
Posts: 7

Original Poster
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Tried recompiling with 2.4.24.4, no change.
 
  


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