Limited Resolution Choices in Xrandr with External Monitor on Hotplug
I am running Fedora 12 on a T400 Thinkpad. When connector my external monitor prior to powering on the computer or if I restart it, I get a lot of resolution choices from xrandr. See below.
There seem to several variables to reproducing the behavior. If I restart without the laptop without the monitor plugged in, log in, and then, plug the monitor in with the monitor powered on prior to plugging, all resolutions are detected properly. However, if I plug the monitor in with it powered off, then power it on, I only get the few options shown in above. Once I get the reduced number of options, it seems to stay that way till I restart regardless of how I unplug the monitor.
I have found a work-around by just forcing the modes with xrandr --newmode and xrandr --addmode, but I would much rather have the modes autodetected.
You and me both. :) I don't have an answer for you, but I can relate my experience.
My laptop is a Dell Inspiron 1720 purchased about two years ago. It is running an nVidia GeForce 8800 GT. I get a similar behavior to the one you describe, albeit with even fewer resolutions. I also observe the strange okay-if-I-booted-with-a-monitor behavior, although this is not useful to me as I find myself connecting to a variety of projectors.
I found that using the proprietary nVidia blobs and the nvidia-settings tool got me some of the distance I want. nvidia-settings can properly detect the other screens and I can make use of them via TwinView. This is a messy process, however, and fouls up xrandr something awful. Furthermore, I can only get mostly correct behavior using xrandr 1.3; xrandr 1.2 tended to form one large rectangle due to its inability to involve multiple screens in one X display.
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