I have a problem with connecting external monitor to my Dell Precision M6500 laptop. I'm running Debian Stretch with gdm3.
I try to connect external monitor by VGA. My laptop has DP and VGA port.
When using lspci the VGA controller is found:
michal@ntpc01:~$ lspci | grep VGA 01:00.0 VGA compatible controller: NVIDIA Corporation G92GLM [Quadro FX 2800M] (rev a2)
But using xrandr, there is no other port visible:
michal@ntpc01:~$ xrandr xrandr: Failed to get size of gamma for output default Screen 0: minimum 640 x 480, current 1440 x 900, maximum 1440 x 900 default connected primary 1440x900+0+0 0mm x 0mm 1440x900 0.00* 1280x800 0.00 1280x720 0.00 1024x768 0.00 800x600 0.00 640x480 0.00
I installed nvidia drivers in legacy(340xx) version and bumblebee. As instructed in NvidiaDirvers Manual. I have also installed firmware-linux-nonfree. Before installing drivers I have no problem with listing displays in xrandr, but monitor hasn't been recognized. I found that it may be caused by not having drivers, so I installed it and have a problem like this.