w83l785ts inserted but no readings right away

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Jean Delvare wrote:

>>I have an Asus A7N8X-X mainboard with the asb100 (bach) and the 
>>w83l785ts chip. Latter one reads the internal CPU-temp-diode. When
>>all needed modules are loaded it works really well including
>>fancontrol.
>>
>>But the w83l785ts doesn't always work. When the module is inserted
>>trough the lm_sensors start-script it is listed when doing lsmod but
>>there is no /sys/bus/i2c/devices/1-002e/ directory. After I rmmod and
>>modprobe the module (sometimes several times) everything works. When
>>using Windows I realized that Speed Fan also sometimes failes to
>>detect the w83l785ts-chip. Is this a known problem and do you know a
>>workaround? There are no error-messages from modprobe, dmesg or
>>anybody else.
>>    
>>
>
>This much reminds me this bug report:
>http://bugzilla.kernel.org/show_bug.cgi?id=2899
>
>Please read the whole thread and confirm, or detail why your case is
>different.
>  
>
This matches my problem, except that I had one case where I rmmoded and 
then modprobed the w83l785ts module again it still didn't work and it 
took a second try.

>Next step would be to apply the proposed patch and recompile your
>kernel, including "I2C chip debugging messages", then compare a working
>case with a failing one, and report. I suspect that reads are sometimes
>wrong with no error reported, due to the BIOS messing up with the SMBus.
>If that's the case there's (unfortunately) not much we can do...
>  
>
Reads have been fine so far. Unfortunatly I'm not using a self compiled 
vanilla kernel but maybe I can quickly compile one tomorrow or so (after 
a math examination). I have now changed the configuration to first load 
the w83l785ts module and then the asb100 module, after a few reboots 
I'll see if it helped. I will report if it does.

>>BTW: I had to change pwmconfig a bit for it to detect the fanX_pwm
>>lines of the asb100. In it s current state it only finds pwmX . I can
>>send it to you if you don't know what I mean.
>>    
>>
>
>Yes, please provide your changes in the form of a patch. We'll review it
>and see if it's acceptable.
>
>Thanks.
>  
>
It looks like the script has been corrected in lm_sensors 2.8.7 so 
nevermind about this.

Thank you for your help
Johannes H?bner



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