Rotation only works up to 1080p instead of 1440x2560
 

I'm using an iMac 27" mid-2010 with 3 Dell U2713HM monitors in portrait mode.

MONITOR 1: With the built-in mini-DisplayPort the first monitor will rotate to 1440x2560 resolution. This is using built-in video drivers.

MONITOR 2: With the StarTech DisplayPort adapter running over USB2, I can get the second monitor to run at 2560x1440. This is using the DisplayLink 2.0a2 driver. But when I try to rotate it 90/180/270 it won't go 1440x2560. When it's 180 degrees, it still doesn't show 2560x1440. It defaults to 1080p, and the scaled resolutions max out at 1200x1600 and 1080p (which I think is 1080x1920).

MONITOR 3: Same thing as monitor 2. DisplayLink adapter doesn't want to rotate 2560x1440 resolution to 1440x2560. It drops down to 1080p.

Is there a workaround for this? Is there a Display Override that I should be using or does the 2.0a2 driver need to be updated to support rotation above 1200x1920?

Which OS X version is it? Can you please post the logs captured when all your screens are connected? Thanks.

Here's my diagnostic file. I'm running under OS X 10.8.2. I'm using an iMac 27" with 3 identical Dell U2713HM monitors. The first Dell is rotated at 1440x2560 using on-board video through a mini-DisplayPort to DisplayPort cable. The second and third monitors are rotated at 1080p using USB2 to a DisplayLink adapter to DisplayPort cable.

I've also posted a video for you here of the issue. Hope that helps to see it.
http://www.idiotsavant.com/displayli...tion-issue.mp4

Wow, that's an impressive setup :) Thanks for the video, it clearly shows what's wrong and we are able to reproduce it. We'll try to address it in future builds.

Thanks,
Michal