On Mon, Dec 08, 2014 at 12:32:01PM +1000, Dave Airlie wrote:
I suspect a lot of the problems are just that xfce isn't sufficiently handling randr events, and it is getting out of sync, it is like hotplug networking before NetworkManager etc.
Yes, I've seen this on XFCE 4.11 (in Ubuntu), although I haen't seen it in XFCE 4.10 (in Debian). In 4.11, when xfce gets out of sync, xrandr --auto will allow me to enable the display, even when xfce4-display-settings does not.
However, on my T540p with the monitors connected via the dock, which is the problem I was describing here, xrandr --auto does *not* fix things up. So I think it's a different problem, since I can see this problem even if I don't use xfce4-display-settings, and just use xrandr directly.
- Ted