Hi, I obtained an Intel 975XBX2 Mainboard a while ago, and finally got round to have a look at the sensors. I'm using the asc7xxx driver I found in the list archives (posted by George T. Joseph in December), which compiles, loads and detects the aSC7621 just fine. The machine is equipped with an Intel Core 2 Duo E6600 and is running Gentoo Linux with a Xen-patched 2.6.16.49 kernel (Gentoo package xen-sources-2.6.16.49); sensors is version 2.10.3 with libsensors version 2.10.3. sensors isn't quite happy though, the output ist just: | asc7621-i2c-0-2e | Adapter: SMBus I801 adapter at 2000 So I suppose it doesn't recognise the aSC7621 as a valid sensor chip, but there doesn't appear to be a --force option or some such to get it to read the values anyway. Any suggestions on this? Meanwhile, I had a look at the input files in /sys/devices/pci0000:00/0000:00:1f.3/i2c-0/0-002e: | magrathea 0-002e # grep . *input | fan1_input:360 This is the CPU fan (4 wires), reading is correct. | fan2_input:364 Intel labels this one as 'auxiliary' or 'auxiliary rear' fan, 4 wires, reading correct. | fan3_input:301 Front fan, 3 wires. The reading sometimes jumps to twice this value, and then back again after a while. I found that this fan will speed up a bit when calling up the hardware monitoring screen in the BIOS, probably because pulse stretching gets enabled, yet it doesn't do so when loading the driver - maybe the driver ought to set some bit for pulse stretching in the aSC7621? The BIOS shows this one with about 840 rpm. | fan4_input:354 Rear fan, 3 wires. Same as fan3, though this one doesn't change its reading when stopping the fan, yet goes to 0 when disconnecting it entirely. However, this likely an issue of the fan (maybe pulses in supply voltage propagating to the tach output). About 720 rpm in BIOS. Next, the voltages with the corresponding BIOS labels: | in0_input:1533 V1.5 | in1_input:1187 Vccp, BIOS says 1.300 though. | in2_input:3293 V3.3 | in3_input:4986 V5.0 | in4_input:12077 V12.0 Except for Vccp, the readings are close to what the BIOS shows. | peci_temp1_input:-28481 | peci_temp2_input:-92501 | peci_temp3_input:-31110 | peci_temp4_input:-29297 If I'm understanding PECI correctly, these are CPU temperatures relative to the tripping point, and hence negative. Is this correct? Assuming it is, 1 2 and 4 seem roughly reasonable (or do they? I ought to look up the 'zero' temperature for the E6600), however, these values don't change at all, even after several days. Is there some way to force a refresh? Now, time for some cooling spray to locate the other temp sensors... | temp1_input:33750 This is the CPU temperature. As the aSC7621 has diode inputs, does this mean the CPU has a traditional diode in addition to that PECI stuff? The reading is somewhat lower than the BIOS shows, but that may be due to the BIOS code not making use of some power saving features. | temp2_input:43500 This is the aSC7621 itself, located close to the CPU socket, well within the air flow coming from the CPU heatsink. Reading matches BIOS. | temp3_input:41750 A diode between the RAM sockets. Matches BIOS. | temp4_input:0 What's this? According to Documentation/hwmon/asc7xxx the aSC7621 supports two remote diodes and its internal one - where is the fourth reading supposed to come from? Regards, Sebastian -- Sebastian Flothow sebastian at flothow.de Because it reverses the logical flow of conversation. > Why is top posting frowned upon?
