https://bugs.freedesktop.org/show_bug.cgi?id=110213
Bug ID: 110213
Summary: Used pwm value is lesser than the requested value
Product: DRI
Version: unspecified
Hardware: x86-64 (AMD64)
OS: Linux (All)
Status: NEW
Severity: normal
Priority: medium
Component: DRM/AMDgpu
Assignee: [email protected]
Reporter: [email protected]
Created attachment 143743
--> https://bugs.freedesktop.org/attachment.cgi?id=143743&action=edit
dmesg
On manual fan control through pwm interface, the used value on pwm1 is lesser
that the requested value (except for maximum).
For example:
echo 1 > /sys/class/drm/card0/device/hwmon/hwmon1/pwm1_enable
echo 10 > /sys/class/drm/card0/device/hwmon/hwmon1/pwm1
cat /sys/class/drm/card0/device/hwmon/hwmon1/pwm1
5
echo 100 > /sys/class/drm/card0/device/hwmon/hwmon1/pwm1
cat /sys/class/drm/card0/device/hwmon/hwmon1/pwm1
96
echo 254 > /sys/class/drm/card0/device/hwmon/hwmon1/pwm1
cat /sys/class/drm/card0/device/hwmon/hwmon1/pwm1
249
The maximum value works as expected:
echo 255 > /sys/class/drm/card0/device/hwmon/hwmon1/pwm1
cat /sys/class/drm/card0/device/hwmon/hwmon1/pwm1
255
Other info:
Hardware: MSI RX480 Gaming (Polaris)
Kernel: linux 5.0.2
Please, let me know if more info is needed.
Thanks.
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