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