Created attachment 255947 [details] binary edid obtained with read-edid (complained about extra blocks) Since introduction of DP audio in 4.0 all the way to 4.10 monitor does not sync unless mode <=1920x1080 is used or radeon module is loaded with audio=0. Tried modes 1920x1200 (nearest supported larger mode) and 2560x1440 (native).
Created attachment 255949 [details] text representation of edid as decoded by edid-decode
Created attachment 255951 [details] radeon card pci id
Created attachment 255953 [details] binary edid obtained with read-edid using i2c driver
Created attachment 255955 [details] text representation of edid as decoded by edid-decode