displayport not working:
[   73.328376] [drm:dp_ctrl_link_train [msm]] *ERROR* max v_level reached
[   73.328440] [drm:dp_ctrl_link_train [msm]] *ERROR* link training #1 failed. ret=-11
[   73.330567] [drm:dp_display_process_hpd_high [msm]] *ERROR* failed to complete DP link training