xorg.conf is setting the wrong monitor as "main"

daweefolk · 09-20-2017, 02:17 PM

I had a previous question here regarding a dual monitor setup, turns out my second card was unsupported. I plugged second monitor into first card, now both monitors work.

however. the second, smaller, monitor is where everything launches, so I think it's being detected as the "first" monitor. I've included the relavent portions of xorg.conf, let me know if anything else is helpful.

Code:

Section "ServerLayout"
	Identifier     "X.org Configured"
	Screen        "HDMIScreen" 0 0
	Screen	      "VGAScreen" RightOf "HDMIScreen"
	InputDevice    "Mouse0" "CorePointer"
	InputDevice    "Keyboard0" "CoreKeyboard"
EndSection

Section "Monitor"
	Identifier   "HDMI"
	VendorName   "Monitor Vendor"
	ModelName    "Monitor Model"
EndSection

Section "Monitor"
	Identifier "VGA"
EndSection

Section "Device"
        ### Available Driver options are:-
        ### Values: <i>: integer, <f>: float, <bool>: "True"/"False",
        ### <string>: "String", <freq>: "<f> Hz/kHz/MHz",
        ### <percent>: "<f>%"
        ### [arg]: arg optional
        #Option     "Accel"              	# [<bool>]
        #Option     "SWcursor"           	# [<bool>]
        #Option     "EnablePageFlip"     	# [<bool>]
        #Option     "ColorTiling"        	# [<bool>]
        #Option     "ColorTiling2D"      	# [<bool>]
        #Option     "RenderAccel"        	# [<bool>]
        #Option     "SubPixelOrder"      	# [<str>]
        #Option     "AccelMethod"        	# <str>
        #Option     "ShadowPrimary"      	# [<bool>]
        #Option     "EXAVSync"           	# [<bool>]
        #Option     "EXAPixmaps"         	# [<bool>]
        #Option     "ZaphodHeads"        	# <str>
        #Option     "SwapbuffersWait"    	# [<bool>]
        #Option     "DeleteUnusedDP12Displays" 	# [<bool>]
        #Option     "DRI3"               	# [<bool>]
        #Option     "DRI"                	# <i>
        #Option     "TearFree"           	# [<bool>]
	Identifier  "Card0"
	Driver      "radeon"
	Option "Monitor-HDMI-0" "HDMI" #xrandr -q shows hdmi out as "HDMI-0"
	Option "Monitor-VGA-0" "VGA" #and xrandr -q says vga out is VGA-0
	BusID       "PCI:1:0:0"
EndSection

Section "Screen"
	Identifier "VGAScreen"
	Device "Card0"
	Monitor "VGA"
EndSection

Section "Screen"
	Identifier "HDMIScreen"
	Device     "Card0"
	Monitor    "HDMI"
	SubSection "Display"
		Viewport   0 0
		Depth     1
	EndSubSection
	SubSection "Display"
		Viewport   0 0
		Depth     4
	EndSubSection
	SubSection "Display"
		Viewport   0 0
		Depth     8
	EndSubSection
	SubSection "Display"
		Viewport   0 0
		Depth     15
	EndSubSection
	SubSection "Display"
		Viewport   0 0
		Depth     16
	EndSubSection
	SubSection "Display"
		Viewport   0 0
		Depth     24
	EndSubSection
EndSection

norobro · 09-21-2017, 12:54 PM

Set the primary monitor in your desktop manager.

For example, in KDE Plasma5, under System Settings -> Display and Monitor -> Displays, there is a combo box to set the "Primary display".