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Dave Airlie
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Feb 20, 2013
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refs/heads/master: 0d4bbaf9f3e5b9f52150ddc5a4ee8b0ab83a440b | ||
refs/heads/master: ca18e1426bb2db987b67030256477c9571aebd09 |
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Kernel driver nouveau | ||
=================== | ||
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Supported chips: | ||
* NV43+ | ||
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Authors: Martin Peres (mupuf) <martin.peres@labri.fr> | ||
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Description | ||
--------- | ||
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This driver allows to read the GPU core temperature, drive the GPU fan and | ||
set temperature alarms. | ||
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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. | ||
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Temperature management | ||
-------------------- | ||
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Temperature is exposed under as a read-only HWMON attribute temp1_input. | ||
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In order to protect the GPU from overheating, Nouveau supports 4 configurable | ||
temperature thresholds: | ||
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* 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. | ||
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WARNING: Some of these thresholds may not be used by Nouveau depending | ||
on your chipset. | ||
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The default value for these thresholds comes from the GPU's vbios. These | ||
thresholds can be configured thanks to the following HWMON attributes: | ||
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* 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. | ||
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NOTE: Remember that the values are stored as milli degrees Celcius. Don't forget | ||
to multiply! | ||
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Fan management | ||
------------ | ||
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Not all cards have a drivable fan. If you do, then the following HWMON | ||
attributes should be available: | ||
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* 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); | ||
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You may also have the following attribute: | ||
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* fan1_input: Speed in RPM of your fan. | ||
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Your fan can be driven in different modes: | ||
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* 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. | ||
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NOTE: Be sure to use the manual mode if you want to drive the fan speed manually | ||
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NOTE2: Not all fan management modes may be supported on all chipsets. We are | ||
working on it. | ||
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Bug reports | ||
--------- | ||
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Thermal management on Nouveau is new and may not work on all cards. If you have | ||
inquiries, please ping mupuf on IRC (#nouveau, freenode). | ||
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Bug reports should be filled on Freedesktop's bug tracker. Please follow | ||
http://nouveau.freedesktop.org/wiki/Bugs |
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obj-y += drm/ vga/ stub/ | ||
obj-y += drm/ vga/ |
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