Hi John, > i2cdetect -l : > i2c-3 smbus SMBus I801 adapter at ccf0 Non-I2C SMBus adapter > i2c-2 i2c ivtv i2c driver #1 Algorithm unavailable > i2c-1 i2c ivtv i2c driver #0 Algorithm unavailable > i2c-0 smbus SMBus stub driver Non-I2C SMBus adapter Ah. The "SMBus stub driver" is a test driver solely meant to debug SMBus chip drivers. This is what confused sensors-detect. Why did you load that driver? > i2cdetect 0 : > 0 1 2 3 4 5 6 7 8 9 a b c d e f > 00: 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f > 10: 10 11 12 13 14 15 16 17 18 19 1a UU 1c 1d 1e UU > 20: 20 21 22 23 24 25 26 27 28 29 2a 2b 2c 2d 2e 2f > 30: 30 31 32 33 34 35 36 37 38 39 3a 3b 3c 3d 3e 3f > 40: 40 41 42 43 44 45 46 47 UU UU UU UU 4c 4d 4e 4f > 50: UU UU UU UU UU UU UU UU 58 59 5a 5b 5c 5d 5e 5f > 60: 60 61 62 63 64 65 66 67 68 69 6a 6b 6c 6d 6e 6f > 70: 70 71 72 73 74 75 76 77 The test driver (i2c-stub) responds to all addresses. It's confusing and you don't need it! Unload i2c-stub. > i2cdetect 1 : > 0 1 2 3 4 5 6 7 8 9 a b c d e f > 00: XX XX XX XX XX XX XX XX XX XX XX XX XX > 10: XX XX XX XX XX XX XX XX XX XX XX UU XX XX XX XX > 20: XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX > 30: XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX > 40: XX XX XX UU UU XX XX XX XX XX XX XX XX XX XX XX > 50: UU XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX > 60: UU UU XX XX XX XX XX XX XX XX XX XX XX XX XX XX > 70: XX XX XX XX XX XX XX XX > > i2cdetect 2 : > 0 1 2 3 4 5 6 7 8 9 a b c d e f > 00: XX XX XX XX XX XX XX XX XX XX XX XX XX > 10: XX XX XX XX XX XX XX XX XX XX XX UU XX XX XX XX > 20: XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX > 30: XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX > 40: XX XX XX UU UU XX XX XX XX XX XX XX XX XX XX XX > 50: UU XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX > 60: XX UU XX XX XX XX XX XX XX XX XX XX XX XX XX XX > 70: XX XX XX XX XX XX XX XX Some media/video adapter you must have in that machine. We don't really care about that. > i2cdetect 3 : > 0 1 2 3 4 5 6 7 8 9 a b c d e f > 00: XX XX XX XX XX XX XX XX XX XX XX XX XX > 10: XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX > 20: XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX > 30: 30 31 XX XX XX XX XX XX XX XX XX XX XX XX XX XX > 40: XX XX XX XX 44 XX XX XX XX XX XX XX XX XX XX XX > 50: UU UU XX XX XX XX XX XX XX XX XX XX XX XX XX XX > 60: XX 61 XX XX 64 XX XX XX XX XX XX XX XX XX XX XX > 70: XX XX XX XX XX XX XX XX Your mainboard SMBus. I see two memory module EEPROMs (SPD), unknown chips at 0x61 and 0x64, but no hardware monitoring chips. > A small snibit of dmesg : > i2c_adapter i2c-0: smbus word data - addr 0x48, read 0x0000 at 0x02. > i2c_adapter i2c-0: smbus word data - addr 0x48, read 0x0000 at 0x03. > i2c_adapter i2c-0: smbus word data - addr 0x48, read 0x0000 at 0x04. > i2c_adapter i2c-0: smbus word data - addr 0x48, read 0x0000 at 0x05. > i2c_adapter i2c-0: smbus word data - addr 0x49, read 0x0000 at 0x00. > i2c_adapter i2c-0: smbus word data - addr 0x49, read 0x0000 at 0x02. > i2c_adapter i2c-0: smbus word data - addr 0x49, read 0x0000 at 0x03. > i2c_adapter i2c-0: smbus word data - addr 0x49, read 0x0000 at 0x04. > i2c_adapter i2c-0: smbus word data - addr 0x49, read 0x0000 at 0x05. > i2c_adapter i2c-0: smbus word data - addr 0x4a, read 0x0000 at 0x00. > i2c_adapter i2c-0: smbus word data - addr 0x4a, read 0x0000 at 0x02. > i2c_adapter i2c-0: smbus word data - addr 0x4a, read 0x0000 at 0x03. > i2c_adapter i2c-0: smbus word data - addr 0x4a, read 0x0000 at 0x04. > i2c_adapter i2c-0: smbus word data - addr 0x4a, read 0x0000 at 0x05. > i2c_adapter i2c-0: smbus word data - addr 0x4b, read 0x0000 at 0x00. > i2c_adapter i2c-0: smbus word data - addr 0x4b, read 0x0000 at 0x02. > i2c_adapter i2c-0: smbus word data - addr 0x4b, read 0x0000 at 0x03. > i2c_adapter i2c-0: smbus word data - addr 0x4b, read 0x0000 at 0x04. > i2c_adapter i2c-0: smbus word data - addr 0x4b, read 0x0000 at 0x05. That's the i2c-stub driver helping you test and debug your code. As you are only trying to get lm_sensors to run, it is completely irrelevant. Just unload i2c-stub. > The Dell Dimension 8250 is a desktop. I can't find any information > about it so I'm not sure it has a thermal sensor or not. Is it > possible to control the fan without it? You can control the fan without a thermal sensor, these are two separate things. However, you need a chip on your motherboard in either case. You don't seem to have such a chip on your SMBus. Fan speed control functions are sometimes integrated in Super-I/O chips (last part of sensors-detect). You may search for hardware monitoring information in the BIOS setup screen. If you can't find any, it's usually a good indication that the board doesn't have the feature. But better ask Dell for details if you can. -- Jean Delvare
