Sound problem Dell Latitude E7470

Hi, I am running Debian Stretch on a Dell Latitude E7470 and I get almost no sound. After running alsactl init as root I have a buzzing sound in my speakers, as well as a short beep when I unmute in alsamixer. But that is all the sound I get. I tested with speakertest. What is the problem and how

xrandr output problem

Hi, I am running Debian stretch on a Dell Latitude E7470. This is my output from xrandr, I expected to get information about what outputs are available. My laptop is connected to another screen (also Dell) though a docking station (HDMI). hedkam@hopper:~$ xrandr xrandr: Failed to get size of gam