DisplayLink Forum - View Single Post - Unexpected limitation of resolutions offered

Pammylu · 06-17-2010, 05:14 AM

Can't figure this one out...

Driving two displays from my MacBook Pro 13", one is a 24" Samsung Syncmaster T2440HD LCD and the other is a Gateway 24" FPD2485W LCD. I'm using the Apple mini-display adapter (DVI) to drive the Samsung and the WS Tech USB-DVI (w/UGA converter to HDMI) adapter with DisplayLink Mac driver 1.5 to drive the Gateway. The Apple mini-display adapter gives me the expected 1920x1200 (60 Hz) resolution offering on the list of supported resolutions and works great. The USB-DVI adapter recognizes the Gateway and offers a list of resolutions, but stops at the highest 1680x1050 (60 Hz), and does not offer the expected 1920x1200 supported by the display. I had used that Gateway on another PC for a few years and it gave me wonderful 1920x1200 resolution.

When I switch the connectors to drive the opposite displays, then the Gateway works fine at 1920x1200 on the Apple DVI mini-adapter, but the Samsung then experiences the limitation of 1680x1050 (60 Hz). This leads me to believe that either the DisplayLink adapter and/or driver is the culprit or possibly, it could be the UGA to HDMI converter. Odd thing is that I was using an NEC MultiSynch 20WMGx2 20" plasma display instead of the Gateway, and it works just great at its highest posted resolution of 1680x105 (60Hz). Does anyone know if this is a bug that needs more work? When I've asked about it on other forums, they tell me to make sure I am using DVI on the Gateway, which I am. Please help if you can figure this out.... thx, pam

P.S. I downloaded the 1.6 driver today and have the exact same results. Have rebooted plenty of times, too. Also, I get no problems with these two external displays using the clamshell method of keeping the MBP closed.

06-17-2010, 05:14 AM	#1
Pammylu Junior Member Join Date: Jun 2010 Posts: 2	Unexpected limitation of resolutions offered Can't figure this one out... Driving two displays from my MacBook Pro 13", one is a 24" Samsung Syncmaster T2440HD LCD and the other is a Gateway 24" FPD2485W LCD. I'm using the Apple mini-display adapter (DVI) to drive the Samsung and the WS Tech USB-DVI (w/UGA converter to HDMI) adapter with DisplayLink Mac driver 1.5 to drive the Gateway. The Apple mini-display adapter gives me the expected 1920x1200 (60 Hz) resolution offering on the list of supported resolutions and works great. The USB-DVI adapter recognizes the Gateway and offers a list of resolutions, but stops at the highest 1680x1050 (60 Hz), and does not offer the expected 1920x1200 supported by the display. I had used that Gateway on another PC for a few years and it gave me wonderful 1920x1200 resolution. When I switch the connectors to drive the opposite displays, then the Gateway works fine at 1920x1200 on the Apple DVI mini-adapter, but the Samsung then experiences the limitation of 1680x1050 (60 Hz). This leads me to believe that either the DisplayLink adapter and/or driver is the culprit or possibly, it could be the UGA to HDMI converter. Odd thing is that I was using an NEC MultiSynch 20WMGx2 20" plasma display instead of the Gateway, and it works just great at its highest posted resolution of 1680x105 (60Hz). Does anyone know if this is a bug that needs more work? When I've asked about it on other forums, they tell me to make sure I am using DVI on the Gateway, which I am. Please help if you can figure this out.... thx, pam P.S. I downloaded the 1.6 driver today and have the exact same results. Have rebooted plenty of times, too. Also, I get no problems with these two external displays using the clamshell method of keeping the MBP closed.