[lm-sensors] i801_smbus 0000:00:1f.3: Bus collision!

Mark M. Hoffman mhoffman at lightlink.com
Thu Sep 8 19:12:34 CEST 2005

Hi Yani:

* Yani Ioannou <yani.ioannou at gmail.com> [2005-09-08 09:56:29 -0400]:
> The bus collisions are expected - both the IPMI BMC (not bmcsensors
> directly) and the i2c modules you have loaded are competing for the
> smbus. However although I've done this (loaded both bmcsensors and i2c
> modules and got bus collisions) its never resulted in a lockup.

I should also point out: I've been able to get my own ICH5/i801 SMBus 
locked up so hard that it takes a complete power cycle for the machine
to even POST correctly.  Ultimately, that's the fault of an extremely
unforgiving SMBus client chip somewhere (to say the least) - and there's
absolutely nothing the I2C/SMBus driver can do about that.

*However* even when this happens for me, *Linux* still runs fine.  It's
only the SMBus itself that gets locked up.  In my case, I can still 
attempt to read sensors or eeprom or whatever, and of course that fails
with tons of collisions - but it doesn't kill the whole kernel.

Richard's symptoms seem to implicate the i2c-i801 and i2c-core patches.


Mark M. Hoffman
mhoffman at lightlink.com

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