> > > > since 26th of February I have problems with the DisplayPort outputs > > of my Lenovo ThinkPad T470p. If I use the notebooks output I can get > > one external monitor to function but daisy chaining does not work. If > > I use the output of the docking station, the external monitors do not > > work at all. >
It could be driver error, Xorg error or misconfiguration. I'd start with checking "$ xrandr" output. > > > > At boot, betwenen GRUB and disk encryption, there is a error message > > that reads relevant: > > > > [drm:drm_dp_send_link_address [drm_kms_helper]] *ERROR* Sending > > link address failed with -5 > > Sounds like a video driver issue. It may be related to your problem or not. If you are using Intel video, then drivers are part of the kernel. And for Nvidia there is a separate package (AFAIK)
