Hi Peter, Markus, On Sat, 01 Nov 2008 23:16:56 +0100, Peter Mahlknecht wrote: > I got the new kernel (2.6.27.4) running, here is what it outputs during boot: > Nov 1 22:48:30 laptop-mali kernel: [ 9.670886] i801_smbus 0000:00:1f.3: PCI INT B -> GSI 19 (level, low) -> IRQ 19 > Nov 1 22:48:30 laptop-mali kernel: [ 9.670946] ACPI: I/O resource 0000:00:1f.3 [0x18e0-0x18ff] conflicts with ACPI region SMBI [0x18e0-0x18ef] > Nov 1 22:48:30 laptop-mali kernel: [ 9.671002] ACPI: Device needs an ACPI driver OK. This confirms that ACPI is using the SMBus so we shouldn't. With kernels >= 2.6.27, you can boot with parameter acpi_enforce_resources=strict and the i2c-i801 driver will decline attaching to the SMBus. > as just wrote before, as long as i2c-i801 isn't loaded i get the right > temperatures, also if em28xx_cx25843 or lm90 (or both) are loaded. > dmesg output from my notebook can be found here: > http://stud3.tuwien.ac.at/~e0526314/dmidecode_log OK, thanks. We may use the DMI data to blacklist your laptop from i2c-i801, although I'd prefer to use an ACPI-based approach. Another test I'd like you to do is: # rmmod em28xx_cx25843 # rmmod lm90 # modprobe i2c-i801 # modprobe i2c-dev # i2cdetect -l (find the i2c bus number for "SMBus I801 adapter at 18e0") # i2cdetect n (where n is the bus number in question) I wonder if this will confuse ACPI the same way loading em28xx_cx25843 does. I don't think em28xx_cx25843 does more to the SMBus that i2cdetect will, so I _think_ i2cdetect should cause the same problem. But I'd like a confirmation, because I am surprised that just probing the bus causes the problem. Markus, this problem could be mitigated if em28xx_cx25843 was properly checking the class of i2c adapters it is going to probe. The cx25843_attach_adapter function should look like this: static int cx25843_attach_adapter(struct i2c_adapter *adapter) { if (!(adapter.class & I2C_CLASS_TV_ANALOG)) return 0; printk(KERN_INFO"cx25843.c: starting probe for adapter %s (0x%x)\n", adapter->name, adapter->id); return i2c_probe(adapter, &addr_data, &cx25843_detect_client); } For future kernels, it should even be converted to the new-style i2c device driver matching model, so that you don't have to probe anything. -- Jean Delvare
