Hi Jean, Jordan, On 4/17/07, Jean Delvare <khali at linux-fr.org> wrote: > Hi David, Jordan, > > On Sun, 15 Apr 2007 16:03:09 -0600, David Hubbard wrote: > > Hi Jordan, > > > > On 4/15/07, Jordan <xero at xeron.cc> wrote: > > > I have a MSI 975x Platinum, which uses the w83627dhg. This one here: > > > > > > http://www.msicomputer.com/product/p_spec.asp?model=975X_Platinum_(Limited_Edition)&class=mb > > > > > > I've applied the DHG patch to my kernel (2.6.20) but I'm currently having some > > > issues controlling the fan speeds. I've tried pwmconfig as well as manually > > > echoing some values to pwm1-4 and pwm1-4_enable. It does correctly control > > > my case fans, but it doesn't seem to have any effect over my CPU fan. I am > > > using one of the new 4 pin cpu fans. > > > > > > My bios has a "smart fan" option for the CPU fan which does work correctly, > > > although this option is not very configurable in the BIOS, it's only an > > > on/off switch with no way to control the temperature that it raises the fan > > > speed at. I found an actual picture of the BIOS screen for reference: > > > http://www.hardocp.com/images/articles/1168231380Rzv7IS7G0U_2_15_l.gif > > > > > > I was hoping to be able to control the CPU fan speed through lm_sensors instead. > > > Disabling the smart fan in the bios leaves the fan running at full speed, but > > > this doesn't seem to make a difference, pwm1-4 continue to have no effect on > > > the fan speed. Any ideas? > > > > Unfortunately, it looks like your CPU fan really is just an on/off > > switch. It may not be controllable by the w83627dhg chip. As you said, > > you have manipulated pwm1-4 to no effect. If you can find a schematic > > for your motherboard, I can tell you for sure. (Jan van Tiggelen, here > > http://lists.lm-sensors.org/pipermail/lm-sensors/2007-March/019282.html, > > seems to have access to some of them.) But the 4-pin fan design does > > allow the fan to be controlled in this binary fashion, either on (full > > speed) or off (low speed, or completely off) -- so I don't think there > > really is any chance of actually controlling the speed of that fan out > > port. > > I don't think that Jordan's CPU fan goes off. My understanding is that > what Jordan qualifies as "on/off" is the BIOS option (no way to set > temperature limits), not the fan behavior when the option is enabled. Okay, I see what you're saying. This sounds good. > I don't understand why the manual mode doesn't work either, but the > following things could probably be tried: > > * Jordan, you say you tried manual mode when the option was disabled in > your BIOS. Can you try again when the option is enabled? If the BIOS > does extra initialization when the option is on, it might make a > difference. > > * You could try to dump the registers of the W83627DHG chip with the > BIOS option off, and then again with the option on, and see if there > are relevant differences. Make sure you do NOT let the w83627ehf driver > load, though, as it could overwrite a few settings. Assuming that your > chip is at the standard address (0x295) you can dump its contents with: > > isadump 0x295 0x295 > > If it lives at a difference address, adjust the command. > > * You could try leaving the option enabled in the BIOS, so the fan is > in automatic mode, then check the value of all pwmN_enable files. If > one has value >= 2, that should be the PWM output controlling your CPU > fan. Then you can check the value of pwmN_target, and maybe change it > to adjust the behavior. > > I seem to remember that the W83627DHG supports more fan control modes > than the w83627ehf driver handles. The 627dhg is actually very similar to the 627ehf. I believe they both support SmartFan 3. However, the 627dhg can work with the ICH7 southbridge using PECI, so there may be additional possiblities that way. David
