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

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Date:	Fri, 05 Nov 2010 08:27:34 +0800
From:	Zhang Rui <rui.zhang@...el.com>
To:	"maciej.rutecki@...il.com" <maciej.rutecki@...il.com>
Cc:	linux-kernel <linux-kernel@...r.kernel.org>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
	"Brown, Len" <len.brown@...el.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>
Subject: Re: [REGRESSION] [2.6.37-rc1] Fan noise after suspend to ram/disk

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@...is:/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@...is:/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@...is:/sys/class/thermal$ cat cooling_device*/cur_state
> 0
> 0
> 0
> 1
> 1
> 1
> 1
> (Runs on full speed)
> 
> maciek@...is:/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@...is:/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@...is:/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@...is:/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@...is:/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


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