I have a MBA connecting via HDMI to Samsung Monitor. Problem is desktop background for Samsung monitor is not showing. There is only grey desktop and doesn't have any changes even I try to change the image of the desktop at System Preferences. Changes for the MBA desktop is ok. Is that a mountain lion bug?
Restarting the Dock seems to work for me, however I don't know what is causing this grey desktop background.
To restart the Dock, type this into Terminal and press enter:
OS X allows you to select different images for each display. When you open the Desktop section in Desktop & Screen Saver Preferences, you should get one dialog on each screen for choosing a desktop image. Each dialog controls only the image for that screen, so make sure you're setting the image you want on both screens.
I also experienced this problem and found this workaround:
- Open System Preferences -> Displays -> Arrangements
- switch on "Mirror Displays" and switch it off again
This is no solution for the problem of course, but at least the wallpaper is showing again without rebooting...
protected by Community♦ Oct 23 '12 at 11:08
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