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Old 02-15-2012, 06:33 PM
Jonathan Nieder
 
Default Bug#640293: Presario A975 EM: fan runs at a constant (low) speed after hibernate, until it starts to overheat

Hi Philip,

Philip Ashmore wrote:

> The thing is, when my laptop resumes from hibernate:
> The fan runs at a constant audible low speed.
> Usually the fan is so quiet it's inaudible when the cpu is idle, but after
> hibernate I know something's up.
>
> artsd pops up a message box - cpu overload, aborting.
>
> When I run something that taxes one or both cores, the fan speed doesn't
> increase, but a couple of minutes in the fan will suddenly jump to full
> "emergency vent" mode and the plastic casing near the vent is almost too hot
> to touch.

I think our best bet for solving this is to get help from upstream.

Please test 3.2.4-1 from unstable or newer, and if it reproduces the
bug, file a report at <http://bugzilla.kernel.org/>, product ACPI,
component Power-Fan and let us know the bug number so we can track it.

Be sure to attach output from "acpidump", "grep . /sys/class/thermal/*/*"
before and after hibernating, and "dmesg" after hibernating (as
separate attachments, uncompressed).

Compare <https://bugzilla.kernel.org/show_bug.cgi?id=19452>.

Thanks and hope that helps,
Jonathan



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Old 02-16-2012, 12:24 AM
Philip Ashmore
 
Default Bug#640293: Presario A975 EM: fan runs at a constant (low) speed after hibernate, until it starts to overheat

On 15/02/12 19:33, Jonathan Nieder wrote:

Hi Philip,

Philip Ashmore wrote:


The thing is, when my laptop resumes from hibernate:
The fan runs at a constant audible low speed.
Usually the fan is so quiet it's inaudible when the cpu is idle, but after
hibernate I know something's up.

artsd pops up a message box - cpu overload, aborting.

When I run something that taxes one or both cores, the fan speed doesn't
increase, but a couple of minutes in the fan will suddenly jump to full
"emergency vent" mode and the plastic casing near the vent is almost too hot
to touch.


I think our best bet for solving this is to get help from upstream.

Please test 3.2.4-1 from unstable or newer, and if it reproduces the
bug, file a report at<http://bugzilla.kernel.org/>, product ACPI,
component Power-Fan and let us know the bug number so we can track it.

Be sure to attach output from "acpidump", "grep . /sys/class/thermal/*/*"
before and after hibernating, and "dmesg" after hibernating (as
separate attachments, uncompressed).

Compare<https://bugzilla.kernel.org/show_bug.cgi?id=19452>.

Thanks and hope that helps,
Jonathan
Just as a last check after upgrading to 3.2.4-1 and
hibernating/resuming, I ran "sensors"

from the lm-sensors package.
It reported this:
acpitz-virtual-0
Adapter: Virtual device
temp1: +55.0C (crit = +100.0C)

even though I was running both cores at 100% for a few minutes.

It looks like the PC doesn't know it's overheating.

I decided not to wait for the "emergency vent" I reported before to kick in.

I rebooted and "sensors" reported:
acpitz-virtual-0
Adapter: Virtual device
temp1: +71.0C (crit = +100.0C)

After a minute or so the fan kicked in a bit more and the temperature
reduced gradually

to 48C.
It looks like the temperature sensor has a resolution of 7-8 degrees.

Does this help or should I still report it upstream?

Regards,
Philip Ashmore



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Old 02-18-2012, 05:48 AM
Jonathan Nieder
 
Default Bug#640293: Presario A975 EM: fan runs at a constant (low) speed after hibernate, until it starts to overheat

Hi Philip,

Philip Ashmore wrote:

> Just as a last check after upgrading to 3.2.4-1 and
> hibernating/resuming, I ran "sensors"
> from the lm-sensors package.
> It reported this:
[...]
> temp1: +55.0C (crit = +100.0C)
[...]
> I rebooted and "sensors" reported:
[...]
> temp1: +71.0C (crit = +100.0C)
[...]
> Does this help or should I still report it upstream?

It helps (it's a nice and concrete symptom), which is why we should
get this information and an acpidump upstream[*] to avoid wasted
effort from them having to discover the same things independently.

Thanks,
Jonathan
[*] http://bugzilla.kernel.org product ACPI component Power-Thermal



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Old 02-18-2012, 12:52 PM
Philip Ashmore
 
Default Bug#640293: Presario A975 EM: fan runs at a constant (low) speed after hibernate, until it starts to overheat

On 18/02/12 06:48, Jonathan Nieder wrote:

Hi Philip,

Philip Ashmore wrote:


Just as a last check after upgrading to 3.2.4-1 and
hibernating/resuming, I ran "sensors"
from the lm-sensors package.
It reported this:

[...]

temp1: +55.0C (crit = +100.0C)

[...]

I rebooted and "sensors" reported:

[...]

temp1: +71.0C (crit = +100.0C)

[...]

Does this help or should I still report it upstream?


It helps (it's a nice and concrete symptom), which is why we should
get this information and an acpidump upstream[*] to avoid wasted
effort from them having to discover the same things independently.

Thanks,
Jonathan
[*] http://bugzilla.kernel.org product ACPI component Power-Thermal


Opened as https://bugzilla.kernel.org/show_bug.cgi?id=42796

Philip



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Old 02-18-2012, 03:41 PM
Jonathan Nieder
 
Default Bug#640293: Presario A975 EM: fan runs at a constant (low) speed after hibernate, until it starts to overheat

forwarded 640293 https://bugzilla.kernel.org/show_bug.cgi?id=42796
quit

Philip Ashmore wrote:

> Opened as https://bugzilla.kernel.org/show_bug.cgi?id=42796

Thanks much.



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