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My Samsung laptop has a 1024x768 resolution, and attached to it is a 23" LG monitor set to a resolution of 1920x1080. I do NOT have the "same image in all monitors" option checked in Monitor Preferences.
When I turn the machine on everything is displayed properly for 5 to 10 seconds, then the LG screen is automatically reset down to 1024x768, and a checkmark appears in the “Same image in all monitors” preferences box. Sometimes I have to reboot more than once before I'm able to manually set the LG screen properly.
I brought this up a while ago and someone suggested setting the resolutions with "xrandr" on startup. They gave these examples, but without any details on how to do all this:
I’ve spent a LOT of time trying to figure it out. I still don’t really understand what “xrandr” is, but I gather that the xrandr lines are supposed to be put in an “init” file. I assume the “init” file is invoked when you turn the machine on. (Though I also found a page on the LinuxQuestions site that said the “init” file is often not read at startup in version 10.04, which makes me wonder about this whole process.)
In any case, I haven't been able to get the "init" file to save anything that I add to it -- so of course I don't really know if I'm putting in the right lines.
Does anyone have any idea on some other approach to this problem? -- possibly one that doesn't assume the user is a programmer? It’s very common for people with laptops to connect them to larger screens. Surely there’s an efficient way to make that work! Thanks for your help.