Rotation only works up to 1080p instead of 1440x2560

miller5369 · 02-05-2013, 12:02 AM

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?

02-05-2013, 12:02 AM	#1
miller5369 Junior Member Join Date: Jan 2013 Posts: 12	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?