Because RedHat was used for the first time and kde Desktop was used for the first time, after the system was installed, there was still a problem, and the problem of sound was not solved for a long time, finally, I finally found it. It turns out that we need to install KMix. Now it's easy to do it. Enter $ sudoyuminstallkdemultimediakdemultimedia-develkdemultimedia-lib on the terminal to install it, you can adjust the sound size.
Because RedHat was used for the first time and kde Desktop was used for the first time, after the system was installed, there was still a problem, and the problem of sound was not solved for a long time, finally, I finally found it. It turns out that we need to install KMix. Now it's easy to do. Enter it directly on the terminal:
$ Sudo yum install kdemultimedia-devel kdemultimedia-lib
In this way, you can adjust the sound size.
