https://bugs.freedesktop.org/show_bug.cgi?id=100666
--- Comment #5 from Lucas Riutzel lriutzel@gmail.com --- $ ls /sys/class/drm/card*/device/hwmon/hwmon*/pwm*
/sys/class/drm/card0/device/hwmon/hwmon0/pwm1 /sys/class/drm/card0/device/hwmon/hwmon0/pwm1_enable /sys/class/drm/card0/device/hwmon/hwmon0/pwm1_max /sys/class/drm/card0/device/hwmon/hwmon0/pwm1_min