https://bugzilla.kernel.org/show_bug.cgi?id=12788





--- Comment #55 from James Ettle <theholyet...@googlemail.com>  2010-09-27 
09:30:09 ---
Sorry about the delay. I've just tried with a build of kernel 2.6.35.4 (OK, not
the absolute latest...) and the problem still remains, albeit with a reduced
number of stealth wakeups. The cmdline for this kernel is:

 ro root=/dev/mapper/vg_rhapsody-lv_root rd_LVM_LV=vg_rhapsody/lv_root
rd_LVM_LV=vg_rhapsody/lv_swap rd_NO_LUKS rd_NO_MD rd_NO_DM LANG=en_GB.UTF-8
KEYBOARDTYPE=pc KEYTABLE=uk rhgb quiet processor.ignore_tpc=1

Note that without the max_cstate=1, this kernel also suffers from the "pausing"
problem whereby I have to keep pressing keys/moving the mouse/otherwise
generate interrupts otherwise the machine just stops.

powertop before suspend/resume:


Cn                Avg residency       P-states (frequencies)
C0 (cpu running)        ( 5.7%)         2.11 Ghz     3.6%
C0                0.0ms ( 0.0%)         2.10 Ghz     0.1%
C1 mwait          0.3ms ( 0.0%)         1.60 Ghz     0.5%
C2 mwait          0.2ms ( 0.5%)         1200 Mhz     0.1%
C3 mwait          3.7ms (93.8%)          800 Mhz    95.7%

Wakeups-from-idle per second : 284.8    interval: 5.0s
no ACPI power usage estimate available

Top causes for wakeups:
  51.5% (193.6)     <kernel core> : hrtimer_start_range_ns (tick_sched_timer) 
  11.0% ( 41.4)       <interrupt> : extra timer interrupt 
   5.7% ( 21.6)       packagekitd : hrtimer_start_range_ns (hrtimer_wakeup) 
   4.2% ( 15.8)       <interrupt> : acpi 
   3.9% ( 14.6)       <interrupt> : ata_piix 
   3.6% ( 13.4)     <kernel core> : hrtimer_start (tick_sched_timer) 


After:


Cn                Avg residency       P-states (frequencies)
C0 (cpu running)        (20.4%)         2.11 Ghz     1.6%
C0                0.1ms ( 0.0%)         2.10 Ghz     0.4%
C1 mwait          6.3ms (32.0%)         1.60 Ghz     0.5%
C2 mwait          0.0ms (32.3%)         1200 Mhz     0.0%
C3 mwait          0.3ms (15.3%)          800 Mhz    97.5%

Wakeups-from-idle per second : 15059.6  interval: 10.0s
no ACPI power usage estimate available

Top causes for wakeups:
  30.2% ( 64.2)     <kernel core> : hrtimer_start_range_ns (tick_sched_timer) 
  15.1% ( 32.1)       <interrupt> : acpi 
  11.2% ( 23.9)       <interrupt> : iwlagn 
   7.1% ( 15.2)     <kernel core> : hrtimer_start (tick_sched_timer) 
   6.3% ( 13.5)       <interrupt> : ata_piix 
   5.0% ( 10.6)           gkrellm : hrtimer_start_range_ns (hrtimer_wakeup)

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