Re: [REGRESSION] [2.6.37-rc1] Fan noise after suspend to ram/disk

Zhang Rui
2010-11-05T00:27:12Z

On Fri, 2010-11-05 at 00:06 +0800, Maciej Rutecki wrote:
> 1.
> Last known good kernel: 2.6.36
> Bad kernel: 2.6.37-rc1
> ===============================
>
> 2. Problem:
> When I resume computer from s2ram/s2disk and current CPU temp is below lowest
> trip point, and -- from unknown reason -- fan start in maximum speed it
> doesn't turn off (it should).
>
could you please attach the output of "grep . /sys/class/thermal/*/*"
when this happens?

thanks,
rui

> It doesn't happen always but only when fan starts work and any of trip points
> aren't exceed. It seems that system only check temperature when exceed trip
> point.
> ===============================
>
> 3. /sys/cass/thermal/ info:
>
> I have:
> maciek@gumis:/sys/class/thermal$ ls
> cooling_device0 cooling_device2 cooling_device4 cooling_device6
> thermal_zone1 thermal_zone3
> cooling_device1 cooling_device3 cooling_device5 thermal_zone0
> thermal_zone2 thermal_zone4
>
> maciek@gumis:/sys/class/thermal$ cat cooling_device*/type
> LCD
> Processor
> Processor
> Fan
> Fan
> Fan
> Fan
>
> ===============================
>
> Colling device from 3 to 6 are inform what is current fan speed, for example:
> cooling_device3 = 0
> cooling_device4 = 0
> cooling_device5 = 0
> cooling_device6 = 0
> Means that fan is off.
>
> cooling_device3 = 0
> cooling_device4 = 0
> cooling_device5 = 0
> cooling_device6 = 1
> Means fan works on 40% of full speed (1st trip point is exceed).
>
> cooling_device3 = 1
> cooling_device4 = 1
> cooling_device5 = 1
> cooling_device6 = 1
> Means fan works on full speed (all (4) trip points is exceed).
> ===============================
>
> 5. State when fan works on full speed after resume:
> maciek@gumis:/sys/class/thermal$ cat cooling_device*/cur_state
> 0
> 0
> 0
> 1
> 1
> 1
> 1
> (Runs on full speed)
>
> maciek@gumis:/sys/class/thermal$ cat thermal_zone0/trip_point_*
> 256000
> critical
> 78000
> active
> 70000
> active
> 60000
> active
> 50000
> active
>
> (It's OK for current CPU temp)
>
> "sensors" command shows:
> maciek@gumis:/sys/class/thermal$ sensors
> acpitz-virtual-0
> Adapter: Virtual device
> temp1: +37.0°C (crit = +256.0°C)
> temp2: +42.0°C (crit = +90.0°C)
> temp3: +33.0°C (crit = +105.0°C)
> temp4: +20.0°C (crit = +90.0°C)
> temp5: +100.0°C (crit = +110.0°C)
>
> "temp1" in this model of HP notebook is only for debug purposes (I think).
> "temp2" shows CPU temp (fan speed depends on it)
> "temp5" shows fan speed in % of maximum speed.
> ===============================
>
> 6. I run this command, to "hot" the processor:
> "while true; do echo -n; done"
> and cancel it, when I see, that first trip point was exceed, and fan starts
> working on lower speed.
> ===============================
>
> 7. When it done I saw:
> maciek@gumis:/sys/class/thermal$ cat cooling_device*/cur_state
> 0
> 0
> 0
> 0
> 0
> 0
> 1
>
> Fan works on 40% of full speed. It's OK.
>
> maciek@gumis:/sys/class/thermal$ cat thermal_zone0/trip_point_*
> 256000
> critical
> 78000
> active
> 70000
> active
> 60000
> active
> 45000
> active
>
> Last trip point was changed from 50000 to 45000 because trip point was exceed
> (it's OK, fan stops working below 45*C or starts working on 60% speed, above
> 60*C).
>
> "sensors" show:
> maciek@gumis:/sys/class/thermal$ sensors
> acpitz-virtual-0
> Adapter: Virtual device
> temp1: +50.0°C (crit = +256.0°C)
> temp2: +48.0°C (crit = +90.0°C)
> temp3: +34.0°C (crit = +105.0°C)
> temp4: +20.0°C (crit = +90.0°C)
> temp5: +40.0°C (crit = +110.0°C)
> ===============================
>
> Dmesg:
> http://unixy.pl/maciek/download/kernel/2.6.37-rc1/gumis/dmesg-2.6.37-rc1.txt
>
> acpidump:
> http://unixy.pl/maciek/download/kernel/2.6.37-rc1/gumis/acpidump.dat
>
> Config:
> http://unixy.pl/maciek/download/kernel/2.6.37-rc1/gumis/config-2.6.37-rc1
>
> Regards