I was playing around with my ATI Radeon 57xx card and my Syncmaster 213T display and now the display only operates in landscape mode even though it's fully capable of running in portrait mode (which is how it has been physically turned for ages now). Here are some details:
1. I'm running Windows 7 64 bit, and I have the latest version of Catylist control center and the latest ATI drivers (just downloaded them last night).
2. The monitor in question is attached to the PC as follows: ATI Displayport --> Displayport-to-DVI adapter --> DVI port on monitor.
3. The Displayport-to-DVI adapter is a passive model.
4. It was working fine in this arrangement in portrait mode until I messed around with Catylist earlier in the evening to see what kind of error I'd get if I tried to turn on Eyefinity even though my monitors are not set to the same resolutions.
Boy, that was a mistake, eek!
So I've screwed it up and now neither Catylist nor the Windows Control Panel "change resolution" applet shows the "portrait" or "landscape" modes for this monitor and it is stuck running in Landscape mode attached to the computer in this way.
The dropdown button simply does not display
when the monitor is active. The button is not just greyed out...it's not there at all. I have tried shutting off the monitor, unplugging the DVI cable to the monitor, "disconnecting" it in Windows and rebooting, reconnecting, etcetera. Thus far Windows seems to be remembering that monitor and refusing to let me rotate the display for that monitor by itself.
I have not yet tried to remove the Displayport adapter or plutting the display into the other DVI output port on the 57xx.
At one point, I tried duplicate "1+3" setup to make two monitors display in portrait mode. My Syncmaster is left, and my Dell is right, both are turned to portrait and have similar (but not the same) resolution settings. This seemed to work...the Syncmaster went along for the ride and displayed in portrait. But running left and right in duplicate is not what I want.
I'm sure I just buggered up some setting either in the Windows Registry or someplace in the guts that maintain and remember information about specific monitors that have been hooked up. I believe there's a bit someplace that says "can rotate this screen" and it's probably 0 or 1...and it probably got set to 0 by accident. Whatever it is, it's persistent across a system boot.
I have a small hunch that I may be able to get back to factory default by uninstalling all ATI drivers and Catalyst software, then rebooting before reinstalling. But that's pretty harsh, and I'd like to find a simpler way first. If one exists.
By the way, the monitor works in portrait via VGA to a second computer. So I know it can display in portrait just fine.