Hi,

I wanted to test to reduce the light of the matrix led then I use the site
https://pythonhosted.org/sense-hat/api/
and go to the "low_light" section.

I tried this code :

import time
from sense_hat import SenseHat

sense = SenseHat()
sense.clear(255, 255, 255)
sense.low_light = True
time.sleep(2)
sense.low_light = False

The leds light in white but after this message appears
fcntl.ioctl(f, self.SENSE_HAT_FB_FBIORESET_GAMMA, cmd)
OSError: [Errno 25] Inappropriate ioctl for device

then, I tried this one :

import time
from sense_hat import SenseHat

sense = SenseHat()
sense.clear(255, 127, 0)

print(sense.gamma)
time.sleep(2)

sense.gamma = reversed(sense.gamma)
print(sense.gamma)
time.sleep(2)

sense.low_light = True
print(sense.gamma)
time.sleep(2)

sense.low_light = False

and the result was :
fcntl.ioctl(f, self.SENSE_HAT_FB_FBIOGET_GAMMA, buffer)
OSError: [Errno 25] Inappropriate ioctl for device

I use a Raspberyy pi 4 8GB with a Sense Hat v2 module
I use Thonny Python
The OS is Raspbian bookworm
python --version
Python 3.11.2

pip freeze
RTIMULib==7.2.1
sense-hat==2.6.0
thonny==4.1.4

Thanks for your help