I rebooted with power plug, wired network cable and USB mouse plugged
in. Screen blanking and so on disabled. No applications running except
for a gnome-terminal and a bash one-line loop to record temperature
every ten secondd, and occasionally powertop. Temperature stays normal,
at about 50 degrees.
Powertop at this time:
--
PowerTOP version 1.9 (C) 2007 Intel Corporation
Cn Avg residency P-states (frequencies)
C0 (cpu running) ( 0,7%) 1067 Mhz 5,6%
C1 0,0ms ( 0,0%) 800 Mhz 94,4%
C2 25,6ms (76,1%)
C3 72,0ms (23,2%)
Wakeups-from-idle per second : 32,9 interval: 20,0s
no ACPI power usage estimate available
Top causes for wakeups:
24,5% ( 8,7) <interrupt> : uhci_hcd:usb4, [EMAIL
PROTECTED]:0000:00:02.0
11,1% ( 4,0) S20powernowd : queue_delayed_work_on (delayed_work_timer_fn
10,9% ( 3,9) <interrupt> : acpi
10,2% ( 3,6) <kärnmodul> : usb_hcd_poll_rh_status (rh_timer_func)
5,9% ( 2,1) scim-panel-gtk : schedule_timeout (process_timeout)
5,6% ( 2,0) <kernel core> : queue_delayed_work_on (delayed_work_timer_fn
)
--
I try to close the lid (blanking the screen); unplugging and plugging in the
power cord; reenabling the screen blank timeout setting in gnome-power-manager
(does not seem to "take" though). I plug in a USB memory stick (which does not
get automounted, perhaps due to me using Hardy kernel), write some files to it,
and unmount and remove it. Throughout this, temperature stays normal and
'powertop' output looks like above.
Then I unplug the usb mouse (which has been plugged in and working since
boot). Suddenly temperature jumps to about 80 degrees, and powertop
output looks like this, constantly with over 20000 interrrupts per
second:
--
PowerTOP version 1.9 (C) 2007 Intel Corporation
Cn Avg residency P-states (frequencies)
C0 (cpu running) (63,4%) 1067 Mhz 7,2%
C1 0,0ms ( 0,0%) 800 Mhz 92,8%
C2 0,0ms (21,9%)
C3 0,0ms (14,6%)
Wakeups-from-idle per second : 21900,2 interval: 10,0s
no ACPI power usage estimate available
Top causes for wakeups:
74,3% ( 60,0) <interrupt> : uhci_hcd:usb4, [EMAIL
PROTECTED]:0000:00:02.0
4,7% ( 3,8) S20powernowd : queue_delayed_work_on (delayed_work_timer_fn
4,1% ( 3,3) <interrupt> : uhci_hcd:usb2, ahci, eth0
2,5% ( 2,0) <kernel core> : queue_delayed_work_on (delayed_work_timer_fn
2,5% ( 2,0) scim-panel-gtk : schedule_timeout (process_timeout)
1,2% ( 1,0) multiload-apple : schedule_timeout (process_timeout)
--
When I plug the mouse back in again, the interrupt count doubles:
--
PowerTOP version 1.9 (C) 2007 Intel Corporation
Cn Avg residency P-states (frequencies)
C0 (cpu running) (52,1%) 1067 Mhz 2,1%
C1 0,0ms ( 0,0%) 800 Mhz 97,9%
C2 0,0ms (47,9%)
C3 0,0ms ( 0,0%)
Wakeups-from-idle per second : 44448,9 interval: 10,0s
no ACPI power usage estimate available
Top causes for wakeups:
71,3% ( 60,0) <interrupt> : uhci_hcd:usb4, [EMAIL
PROTECTED]:0000:00:02.0
6,4% ( 5,4) S20powernowd : queue_delayed_work_on (delayed_work_timer_fn
4,8% ( 4,0) <kärnmodul> : usb_hcd_poll_rh_status (rh_timer_func)
2,4% ( 2,0) scim-panel-gtk : schedule_timeout (process_timeout)
2,4% ( 2,0) <kernel core> : queue_delayed_work_on (delayed_work_timer_fn
1,5% ( 1,3) <interrupt> : extra timer interrupt
--
If I subsequently plug in and unplug the mouse it will alternate between
these approximate levels. Meanwhile, the temperature is high enough that
any activity (such as recording this comment) pushes the temperature up
into the mid to high 80's.
So for now it looks like this may be connected to USB event detection -
but as I wrote above, I could plug in and manually mount a USB drive
without this happening, so I'm not clear on what the exact problem could
be.
--
Hardy kernel causes overheating
https://bugs.launchpad.net/bugs/223081
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