i2c_adapter i2c-0: Bus collision!

Stian Jordet liste at jordet.nu
Sat Jan 10 05:06:07 CET 2004


tor, 08.01.2004 kl. 23.05 skrev Jean Delvare: 
> > i2c_adapter i2c-0: Bus collision! SMBus may be locked until next hard
> > reset. (sorry!)
> > 
> > Kernel 2.6.0 with lm-sensors 2.8.2.
> 
> Are you able to reproduce the same behavior with kernel 2.4.24 and
> lm-sensors 2.8.2?

Just tried, and I do. I forgot to mention it in my last mail, but I
sometime has to reload the modules before "sensors" finds any sensor.

> > I get very weird results, especially on the fan, but others as well.
> > Here are three runs of sensors:
> > (...)
> 
> Could you provide a few outputs of "i2cdump 0 0x2d"? I wonder if this
> will show read errors (as "XX") or simply changing values.

Attached three runs. Seems to be some read errors :( On these three runs I got
first three bus-collisions, then one, and last two.

> Does your BIOS provide a feature such as "Circle Of Protection" or
> anything that sounds like "active" hardware monitoring? Is it enabled?

No such option.

> If you have any other chips (eeproms for example) on the bus, do you
> observe similar behavior with these?

Not other chips.

> > It works fine with MBM in Windows. Well, MBM is having some troubles
> > with the temperature (it gets lower and lower as time pass, and ends
> > on about 8-9 degrees celsius. But fan and temperatures are read just
> > fine, never any glitch. On thing thing though, the Vcore2 is 1,70. The
> > Bios reports it correctly, but both MBM and LM-sensors says 1,50. Have
> > no idea why. The 1,50 is static, never changes, while VCore1 (which
> > ideally should be 1,75) varies from 1,75 to 1,79. In the BIOS both
> > seem sane, and varies with 3-4 degrees.
> > 
> > I guess all these problems are because of the bus collision, which I
> > have read usually happens because of bad boards. Which I admit that I
> > do have, but it works in Windows :(
> 
> Which motherboard is it?

A Rioworks SDVIA (http://www.rioworks.com/SDVIA.htm) Not very new, I'm afraid.
And not very good.

> Did you have to enable any particular option in MBM?

Nah, it just worked :)

> > What are the most common reasons for the bus collisions (...)?
> 
> Bad brakes?
> 
> Just kidding... ;)

Hehe :)

I guess this is unsolvable, but I just wanted to hear what you say. Kinda weird
it works so well with MBM, but that's ok. It's just for fun I want it to work.

Thanks for your reply :)

Best regards,
Stian
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