<html> <head> <meta http-equiv="content-type" content="text/html; charset=ISO-8859-1"> </head> <body text="#000000" bgcolor="#FFFFFF"> Hi Nouveau users, Just saw the bitching on Phoronix about lack of fan management in nouveau (no offence Michael, it was justified ;) ). Since it has been working flawlessly for more than a week on my desktop, I decided to let you guys know about it and ask for testing. Here is the code: <meta http-equiv="content-type" content="text/html; charset=ISO-8859-1"> <a href="http://gitorious.org/linux-nouveau-pm/linux-nouveau-pm/commits/thermal">http://gitorious.org/linux-nouveau-pm/linux-nouveau-pm/commits/thermal</a> Please read the following paragraphs before pulling this branch and fry your GPU. The hardware and current limitations --------------------------------------------------- This branch introduces code to drive the most common fan type (and the most problematic one, I guess/hope). We call them PWM fan. The other types are TOGGLE (can only be ON or OFF) and I2C (driven using an I2C chip). The TOGGLE fans aren't supported because I think I lack the hw (to be confirmed). The PWM fans are the most common ones. It supports a full range of speed (from 0% to 100%). The I2C-accessible fans are usually limited to high-end cards. At the moment, the only thing we can do for them is to launch their hwmon driver. This is due to a limitation in hwmon that doesn't let kernel drivers accessing the i2c chips' methods. We are working with the hwmon team and provided a patch to support that: <meta http-equiv="content-type" content="text/html; charset=ISO-8859-1"> <a href="http://www.spinics.net/lists/lm-sensors/msg32906.html">http://www.spinics.net/lists/lm-sensors/msg32906.html</a> If you have such a fan, you can manage it from the userspace. The implemented fan management support ----------------------------------------------------------- Current fan management should only work on what we call PWM fans. This work should be usable up to (not including) nva3 chipset generation. This is because nva3+ cards all have hw to drive the speed of the fan (pwm or i2c). Reading the fan speed (power): cat /sys/class/drm/cardX/device/pwm0 Reading the fan speed (RPM): cat /sys/class/drm/cardX/device/fan0_input Setting the fan management method: echo X > /sys/class/drm/cardX/device/pwm0_enable - X = 0: Fan management disabled, fan power set to 100% - X = 1: Manual fan management (you can set the speed by writing [0->100] to /sys/class/drm/cardX/device/pwm0) - X = 2: The default automatic fan management (equivalent to X = 3 for the moment) - X = 3: Linear fan management. The fan speed is linearly correlated to the temperature. - X = 4: Target temperature management. The fan is driven to keep the GPU to a certain temperature The thermal zone implementation ------------------------------------------------ Since I believe thermal zones are great but massively under-used. I used thermal zones to define some trip points. Here are some noteworthy trip points: - Default mode: Listen to the user commands - Fan boost: Whenever the GPU reaches this temperature, the fan will blow at 100% - Downclocking: Whenever the GPU reaches this temperature, your GPU will be downclocked to the lowest perflvl - Critical: Whenever the GPU reaches this temperature, your computer will shut down to prevent damages. BIG FAT WARNING ----------------------------- For those willing to try this, please watch your GPU temperature closely at any time using "$ sensors" and your fingers. If you think sensors doesn't report the right temperature, please send us a mail with your vbios and show up on IRC (ask mupuf). Check this before having fun with fan management, it is very important! Installation ------------------ cd my_package_directory git clone git://gitorious.org/linux-nouveau-pm/linux-nouveau-pm.git git branch --track thermal origin/thermal Then it is just a matter of compiling and testing your kernel. Please follow your distribution's guide. Report ------------ Please report your story on our IRC channel. Please also send your kernel logs along with your vbios to martin.peres <at> free(dot)fr. Conclusion ------------ Hope you like it. Keep us informed of how well it works ;) Martin (AKA mupuf) PS: Another testing call about power management should also follow but there is something I want to implement before people try it. </body> </html>