After hibernating the computer today, same problem !
Here is the /proc/cpuinfo:
processor : 0
vendor_id : GenuineIntel
cpu family : 6
model : 23
model name : Intel(R) Core(TM)2 Quad CPU Q9550 @ 2.83GHz
stepping : 10
cpu MHz : 2833.000
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 apic 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 nopl aperfmperf pni dtes64 monitor
ds_cpl vmx smx est tm2 ssse3 cx16 xtpr pdcm sse4_1 xsave lahf_lm dts tpr_shadow
vnmi flexpriority
bogomips : 5651.83
clflush size : 64
cache_alignment : 64
address sizes : 36 bits physical, 48 bits virtual
power management:
And /proc/interrupts
CPU0
0: 137 IO-APIC-edge timer
1: 2 IO-APIC-edge i8042
4: 2 IO-APIC-edge
7: 1 IO-APIC-edge parport0
8: 0 IO-APIC-edge rtc0
9: 0 IO-APIC-fasteoi acpi
12: 4 IO-APIC-edge i8042
16: 499332 IO-APIC-fasteoi uhci_hcd:usb3
17: 22657 IO-APIC-fasteoi uhci_hcd:usb4, uhci_hcd:usb7
18: 113 IO-APIC-fasteoi ata_generic, uhci_hcd:usb8, ath
22: 7918 IO-APIC-fasteoi ehci_hcd:usb1, uhci_hcd:usb5
23: 1815402 IO-APIC-fasteoi ehci_hcd:usb2, uhci_hcd:usb6
40: 9341920 HPET_MSI-edge hpet2
42: 2 HPET_MSI-edge
43: 5 HPET_MSI-edge
48: 868500 PCI-MSI-edge ahci
49: 1635787 PCI-MSI-edge eth1
50: 1681680 PCI-MSI-edge i915
51: 924 PCI-MSI-edge hda_intel
NMI: 0 Non-maskable interrupts
LOC: 374 Local timer interrupts
SPU: 0 Spurious interrupts
PMI: 0 Performance monitoring interrupts
IWI: 0 IRQ work interrupts
RES: 53799 Rescheduling interrupts
CAL: 42382 Function call interrupts
TLB: 44245 TLB shootdowns
TRM: 0 Thermal event interrupts
THR: 0 Threshold APIC interrupts
MCE: 0 Machine check exceptions
MCP: 108 Machine check polls
ERR: 13
MIS: 0
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https://bugs.launchpad.net/bugs/785220
Title:
Only one CPU core wakes up from sleep
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