Hi, I'm using a Carrizo-powered HP laptop with it's docking station that has an embedded MST hub. I've been successfully using a 4.9 kernel with an older snapshot of the DC branch having two DP screens connected to it. Since I'm having some occasional stability issues I decided it was time to migrate to 4.11 in hope to get this resolved, especially after Alex published a 4.11 staging branch with everything integrated. I have built a kernel from Alex's amd-staging-4.11 branch with stable kernel 4.11.2 patches rebased on top of it. Unfortunately I had no success with powering up the screens behind the MST hub. The devices are being recognized, and I can even see a cloned image on all screens when in the terminal, but after switching to Xorg only the internal eDP is on and no additional screens are even listed - just as if some enablement step was missing to make the screens appear. I have captured a (quite lengtly) log with drm.debug=0x17 (https://www.dropbox.com/s/wqzgb4i8klt34zr/amdgpu-dc-4.11-20170602.log). During startup no external displays are connected. At the 401 second I have connected the first display to the MST hub, while at 585s I have connected the second one. At 675s both displays have been disconnected from the hub. Regards Chris
