Hi everyone
I am not very experienced with Linux so I hope the question won't seem too stupid.
I have just managed to install Debian 9 (Gnome) on an Imac (from mid 2011). Although most things seem to be ok I am having troubles with brightness.
The brightness bar in the interface is all fine, however if I move the cursor down, the screen doesn't respond.
This is all I have :
/sys/class/backlight
acpi_video0 radeon_bl0
For acpi_video0:
max_brightness is set at 15.
when I change the brightness level with the cursor my acpi_video0 outputs for brightness and actual_brightness change accordingly.
For radeon_bl0:
max_brightness is set at 255
actual_brightness and brightness are set at 103 and won't ever change when I interact with the interface controller for brightness.
I can adjust the screen brightness this way :
echo 100(or whatever number) | sudo tee /sys/class/backlight/radeon_bl0/brightness
I would like to know how I could possibly fix the link with the interface controls ?
Thank you
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Brightness controls issue on Debian 9
- Head_on_a_Stick
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Re: Brightness controls issue on Debian 9
You can drop the echo command and use a here string instead of the pipe:zeroth wrote:echo 100(or whatever number) | sudo tee /sys/class/backlight/radeon_bl0/brightness
Code: Select all
sudo tee /sys/class/backlight/radeon_bl0/brightness <<<"100"
https://wiki.archlinux.org/index.php/Ba ... ne_options
Perhaps the keys will start working if there is only one folder under /sys/class/backlight
Also, have you installed the non-free firmware required by your video card?
deadbang