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I have set up two monitors in my system. One is powered by the HDMI port and the other one is powered by the normal analogue port of the same GPU (Nvidia Ge-force 210).

I just setup twin display in Nvidia settings but can't see cinnamon's panel on the second monitor. How can I fix this?

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I use 2 monitors with Gnome but my panel appears only on the left one, on the top. I'm interested also. – Sigur Nov 24 '12 at 2:04
I think this is one of the problems with Gnome (and Cinnamon as a derivative), they are now taking the route of forcing you into a set up where as Linux users one of our benefits is customization! I think you will struggle with this. Has TwinView enable 2 hot corners (one for each monitor)? – captain_G Nov 24 '12 at 20:09

3 Answers

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Unfortunately Cinnamon does not have this functionality. (yet?) It only shows a panel on your primary monitor. There is an issue about it on github. Please add your support there:
https://github.com/linuxmint/Cinnamon/issues/130

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I'm not sure about Cinnamon (GNOME2), but in XFCE you can have multiple panels, which remember where they are to appear. I would expect Cinnamon to be able to do the same. If not I would suggest trying XFCE or using xfce4-panel in the Cinnamon session (possibly as a replacement for its native panel). The only caveat I'm aware of is that some panel elements (e.g. notification area alias systray) cannot appear on multiple panels at once. This means, that when you disconnect one monitor, the panels move to the remaining one and you have to make sure the ones you want are on top.

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With MATE, you can create new panels and drag them to the second monitor (to enable drag, uncheck "Expand" in the properties, also uncheck "Autohide and "Show hide buttons"). Then, if you add a "Window List" on each display, it will manage each display's windows separately. This is very nice except that the Workspace Switcher still operates on both monitors at once -- hampering the ability to treat the two monitors as independent desktops. Although, it seems that you can workaround this by selectively applying "Always on Visible Workspace".

A setup that I have been using until recently is to enable the proprietary NVIDIA driver which allows you to select each display as a separate X screen -- each with its own panel and Workspace Switcher. There are some limitations of this approach, notably that you can't drag windows between displays, as I mentioned in this other post. This approach worked for me in GNOME2 -- I haven't tested it with the newer desktop environments.

To summarize:

  • Cinnamon: drag:yes, separate-workspace:yes, separate-panel:no, workspace-columns:no
  • MATE: drag:yes, separate-workspace:partial, separate-panel:yes, workspace-columns:yes
  • NVIDIA: drag:no, separate-workspace:yes, separate-panel:yes, workspace-columns:via MATE
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