I am running Cinnamon since quite a while already on Mint 13, and so far couldn't get a dual monitor setup working properly.
I have a notebook in a docking station with an external monitor connected. As long as the monitors are mirroring, both monitors work fine. However, when I try to let them run as separate displays, in the past cinnamon slowed down significantly (as I have described more than a year ago here: viewtopic.php?f=59&t=104578). In Mate however, it always worked fine. This issue appeared in cinnamon versions 1.4, 1.6 and 1.8.
Recently I have upgraded to Cinnamon 2.0.
When I try now to uncheck "mirroring" in the display settings, I get an error message (which I did not get in earlier Cinnamon versions), that the configuration can't be made:
Failed to apply configuration: %s
GDBus.Error:org.freedesktop.DBus.Error.UnknownMethod: No such interface »org.gnome.SettingsDaemon.XRANDR_2« on object at path /org/gnome/SettingsDaemon/XRANDR
Since I am not much of an advanced user, I don't understand this error message, but at least I get something now, which I hope can help to solve the issue
Here are my settings:
System: Kernel: 3.2.0-55-generic i686 (32 bit, gcc: 4.6.3) Desktop: Gnome Distro: Linux Mint 13 Maya
Machine: System: Dell (portable) product: Latitude D820
Mobo: Dell model: 0GF470 Bios: Dell version: A10 date: 01/27/2010
CPU: Dual core Intel CPU T2600 (-MCP-) cache: 2048 KB flags: (nx sse sse2 sse3 vmx) bmips: 8645.24
Clock Speeds: 1: 1000.00 MHz 2: 1000.00 MHz
Graphics: Card: Intel Mobile 945GM/GMS 943/940GML Express Integrated Graphics Controller bus-ID: 00:02.0
X.Org: 1.11.3 drivers: intel (unloaded: fbdev,vesa) Resolution: email@example.com, firstname.lastname@example.org
GLX Renderer: Mesa DRI Intel 945GM x86/MMX/SSE2 GLX Version: 1.4 Mesa 8.0.4 Direct Rendering: Yes