This is because only one program/module can control an i2c device at the same time. Note how we have to remove ddci_backlight. It’s possible to leverage ddcutil together with SystemD to fully off the monitor when you put it to sleep.Ĭreate /usr/lib/systemd/system-sleep/monitor.sh and make it executable: #!/bin/sh I have a weird issue with a monitor sometimes waking up from sleep. However, this doesn’t work reliably in my testing (will contact upstream).ĬLight packages are available in our repository for testing: yum install There is a software which will use the same DDC protocol to automatically manage your display brightness using your web-camera, and a lot more – CLight. You might the correct value by examining the output of ddcutil detect. The workaround is adding to /etc/rc.local (and make it executable): # timeout 3 echo 'ddcci 0x37' > /sys/bus/i2c/devices/i2c-/new_deviceĮcho 'ddcci 0x37' | timeout 3 sudo tee /sys/bus/i2c/devices/i2c-1/new_device If nothing still works, this is likely a fault in your video driver as detailed here. To make this module persistent across reboot, create /etc/modules-load.d/nf with contents: # Load ddcci_backlight.ko at boot You will see the brightness control when clicked on tray icons. The command dracut -f fixed them altogether (after I got rid of the NVIDIA card). I should add that (for historical reasons) after playing with NVIDIA drivers which suck in supporting DDC, I had a bunch of weird boot time issues. Then restart your Gnome session by logging out and logging back in (or running gnome-shell -replace). But this works mostly with laptops.ĭdcci-driver-linux creates the necessary backlight devices under /sys/class/backlight/ and makes things magically work. Gnome has GUI for controlling the brightness of your display. There is something better for day-to-day use. So these command-line options are not for faint-hearted, although may be useful in scripted scenarios. Then you can run it with gddcontrol, but have to do so via sudo, which is quite undesired in the first place. The added benefit, though, is that there is a GUI app available if you install ddccontrol-gtk. Why is because the program relies on a database of known monitors to work its best. The other option is ddccontrol, which may not always work, depending on your specific monitor. # VCP code 0x10 (Brightness): current value = 60, max value = 100 Once installed, you can adjust brightness like this Geeks may resort to ddcutil for controlling their monitor. It allows your operating system to talk to the display for adjusting its settings. You can (almost) fully manage your display thanks to the DDC protocol. Do you want to easily adjust brightness and other settings of your external monitor without touching it? However, the same does not apply to desktop machines. The ability to adjust brightness of your display using the keyboard of your laptop is a given thing. If you want to install NGINX, Varnish, and lots of useful performance/security software with smooth yum upgrades for production use, this is the repository for you. We have by far the largest RPM repository with NGINX module packages and VMODs for Varnish.
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