larfalitl - wrote on 14. December 2014 03:06:
Background: This machine has two video cards, the first supports two screens the second one screen.
Left screen is 1200x1920 (rotated clockwise)
Middle & Right are 2560x1600
Can rotate the left screen 90 clockwise, can put the middle screen in the vertical centre of the left, I.E. +1200+160. Can identify the right screen.
However, when the right screen is activated, the virtual screen size shrinks from the desired 6320x1920 to 6320x1760.
If the middle screen is placed at the bottom of the left screen the virtual screen is set to the correct size, I.E. +1200+320.
If the middle screen is then moved to the middle of the virtual screen, the virtual screen shrinks again.
If the virtual size is set back to the correct size of 6320x1920, the follow error is generated.
xrandr --fb 6320x1920
X Error of failed request: BadValue (integer parameter out of range for operation)
Major opcode of failed request: 140 (RANDR) Minor opcode of failed request: 7 (RRSetScreenSize) Value in failed request: 0x0 Serial number of failed request: 44 Current serial number in output stream: 46