Hi Alessandro, > 2008/5/1 Juerg Haefliger <juergh at gmail.com>: > > Hi Alessandro, > > Hi Juerg, > > > > Hmm... Not very useful at the moment. I'm curious to see if anything > > good ever comes out of it. VIA is notoriously tight lipped about their > > stuff... > > I don't understand such behaviours. VIA should be glad to provide > specs for the development of the drivers for their hardware... Let's not go there. Unfortunately, some companies are like that and dillusional about the importance and significance of their IP :-) > > > It seems like there are three models of C7-D CPU's: C7-D Model A > > > (1.5/2 GHz) and model D (1.5 Ghz) don't support PowerSaver, C7-D Model > > > D (1.8/2 GHz) support PowerSaver (P-States P0-P1). I own a "Model A" > > > C7-D. > > > OK, not good I guess. > > Well, this is the problem: I would like to read CPU temperature so I > can handle the case ventilation (I've installed a fanbus which allow > me to manually change the fan speed). Internal temperature stalls > around 50 ?C and the CPU temperature is always higher than the > internal temperature. With frequency/voltage modulation I would make > my CPU get little colder. I understand. I still think we can get there. > However I tried to update the BIOS (as suggested on the kernel's > bugzilla) but the VIA Flash application corrupted my BIOS and now I'm > forced to change motherboard (I should get the replacement tomorrow). > Maybe I will not get the same motherboard. Hmm... Happened to me too on a EPIA board. Fortunately I have access to a programmer and could reprogram the BIOS externally. > BTW the comments about temperature calculation in the > /etc/sensors3.conf don't contain a formula for the C7 CPU and surely > I'm about to get a different motherboard with the same CPU (maybe a > different model so I can use e_powersaver). So the problem still is > there: how can I get the offset and scale parameters for calculating > the CPU temperature? Is there a method which doesn't imply to use > frequency scaling? Not unless you're willing to drill a hole in your CPU heatsink and stick a thermal probe on the case of the CPU and calculate your way back to the die temp. > > It also seems to be able to throttle the CPU when it gets hot. Maybe > > you can play around with those parameters and set the temp threshold > > low so that it always throttles. Page 54 of the manual also shows some > > BIOS settings for CPU clock and ratio. Have you played with those? > > Yes, I read it. Unfortunately the manual is very criptic about that > and doesn't explain how it does work. I played with those settings but > then I were unable to know if it worked or not (cpufreq-info doesn't > work and lm-sensors have always shown the VID voltage around 1.2V). Can you send me the current settings from the 'Thermal Management' page (pg 33 in the manual) and the 'Frequency/Voltage control' page (pg 54)? I believe you have the knobs to run the CPU at different frequencies. Btw I asked my contact at VIA for the datasheet of the C7 CPU. He's trying to get it for me. ...juerg > > ...juerg > > Bye, Alessandro. >
