GLX extension supported.
  version 1.3
RANDR extension supported.
  version 1.2
XINERAMA extension supported.
  version 1.1
XINERAMA is active.
XVidMode extension supported.
  version 2.2
found Xinerama screen 0: screenNum 0, size 1600x1200, at 0,0
Screen #0, Mode 0: width 2880 height 1200 freq 85 #
       validated: -2
XRandR info
Screen #0, size 0: width 2880 height 1200 rate 50
resource with 1 crtcs, 1 outputs and 1 modes
crtc #0 id 429: 2880 x 1200 @ (0, 0), mode 431, with 1 outputs: 430
output #0 id 430: 'default' supported modes: 431
mode #0 id 431: 2880 x 1200 @ 50.00 '2880x1200'
screen #0 supports GLX
found Xinerama screen 1: screenNum 1, size 1280x1024, at 1600,0
X Error of failed request:  BadValue (integer parameter out of range for operation)
  Major opcode of failed request:  134 (XFree86-VidModeExtension)
  Minor opcode of failed request:  6 (XF86VidModeGetAllModeLines)
  Value in failed request:  0x1a6
  Serial number of failed request:  37
  Current serial number in output stream:  37


fullscreentest returns the following error message:

X Error: BadValue (integer parameter out of range for operation) 2
  Extension:    134 (Uknown extension)
  Minor opcode: 6 (Unknown request)
  Resource id:  0x1a6