Comment 43 for bug 1313539

On archlinux up-to-date (linux 4.12.12), I hit the same problem on the following hardware :

- AMD HD5850
- Benq GW2765HE (DP 1.2)

Solutions I've tried :

- Disabling/enabling DDC/CI
- Disabling/enabling DP Auto Switch (Benq-specific feature I suppose)
- Downgrading to DP 1.1 on the screen

What worked for me is to load the kernel with radeon.audio=0 as per :

https://wiki.archlinux.org/index.php/ATI#DisplayPort_stays_black_on_multimonitor_mode