| ===================== |
| Kernel driver nouveau |
| ===================== |
| |
| Supported chips: |
| |
| * NV43+ |
| |
| Authors: Martin Peres (mupuf) <martin.peres@free.fr> |
| |
| Description |
| ----------- |
| |
| This driver allows to read the GPU core temperature, drive the GPU fan and |
| set temperature alarms. |
| |
| Currently, due to the absence of in-kernel API to access HWMON drivers, Nouveau |
| cannot access any of the i2c external monitoring chips it may find. If you |
| have one of those, temperature and/or fan management through Nouveau's HWMON |
| interface is likely not to work. This document may then not cover your situation |
| entirely. |
| |
| Temperature management |
| ---------------------- |
| |
| Temperature is exposed under as a read-only HWMON attribute temp1_input. |
| |
| In order to protect the GPU from overheating, Nouveau supports 4 configurable |
| temperature thresholds: |
| |
| * Fan_boost: |
| Fan speed is set to 100% when reaching this temperature; |
| * Downclock: |
| The GPU will be downclocked to reduce its power dissipation; |
| * Critical: |
| The GPU is put on hold to further lower power dissipation; |
| * Shutdown: |
| Shut the computer down to protect your GPU. |
| |
| WARNING: |
| Some of these thresholds may not be used by Nouveau depending |
| on your chipset. |
| |
| The default value for these thresholds comes from the GPU's vbios. These |
| thresholds can be configured thanks to the following HWMON attributes: |
| |
| * Fan_boost: temp1_auto_point1_temp and temp1_auto_point1_temp_hyst; |
| * Downclock: temp1_max and temp1_max_hyst; |
| * Critical: temp1_crit and temp1_crit_hyst; |
| * Shutdown: temp1_emergency and temp1_emergency_hyst. |
| |
| NOTE: Remember that the values are stored as milli degrees Celsius. Don't forget |
| to multiply! |
| |
| Fan management |
| -------------- |
| |
| Not all cards have a drivable fan. If you do, then the following HWMON |
| attributes should be available: |
| |
| * pwm1_enable: |
| Current fan management mode (NONE, MANUAL or AUTO); |
| * pwm1: |
| Current PWM value (power percentage); |
| * pwm1_min: |
| The minimum PWM speed allowed; |
| * pwm1_max: |
| The maximum PWM speed allowed (bypassed when hitting Fan_boost); |
| |
| You may also have the following attribute: |
| |
| * fan1_input: |
| Speed in RPM of your fan. |
| |
| Your fan can be driven in different modes: |
| |
| * 0: The fan is left untouched; |
| * 1: The fan can be driven in manual (use pwm1 to change the speed); |
| * 2; The fan is driven automatically depending on the temperature. |
| |
| NOTE: |
| Be sure to use the manual mode if you want to drive the fan speed manually |
| |
| NOTE2: |
| When operating in manual mode outside the vbios-defined |
| [PWM_min, PWM_max] range, the reported fan speed (RPM) may not be accurate |
| depending on your hardware. |
| |
| Bug reports |
| ----------- |
| |
| Thermal management on Nouveau is new and may not work on all cards. If you have |
| inquiries, please ping mupuf on IRC (#nouveau, freenode). |
| |
| Bug reports should be filled on Freedesktop's bug tracker. Please follow |
| http://nouveau.freedesktop.org/wiki/Bugs |
