Comment 138 for bug 898390

Here is everything fine now. But i could not say with which Version it is fixed. The only thing i could say, is:

Don't use the proprietary driver. Don't have a /etc/X11/xorg.conf file. If you are using a proprietary driver, it would be better to adjust the Screensettings within xorg.conf.

My System:
$ lspci -nnk | grep -i -A2 vga
02:00.0 VGA compatible controller [0300]: Advanced Micro Devices [AMD] nee ATI Cedar PRO [Radeon HD 5450] [1002:68f9]
        Subsystem: ASUSTeK Computer Inc. Device [1043:03ca]
        Kernel driver in use: radeon

Working with two Monitors with this graphicscard, one left, one right.:

$ xrandr
Screen 0: minimum 320 x 200, current 3360 x 1050, maximum 8192 x 8192
HDMI-0 disconnected (normal left inverted right x axis y axis)
DVI-0 connected 1680x1050+1680+0 (normal left inverted right x axis y axis) 473mm x 296mm
   1680x1050 59.9*+
 [...]
VGA-0 connected 1680x1050+0+0 (normal left inverted right x axis y axis) 474mm x 296mm
   1680x1050 59.9*+
 [...]

The left is VGA-0, the right one is DVI-0. The resolution is on both Screen 1680x1050. The DVI-0 position is: Absolute, 1680x0 The VGA-0 position is Left from DVI-0.

You have to save your settings explicitly with the Button "Save as Default" beneath the " Identify Outputs"-Button.

Sorry, but for me this Bug is solved.