How do I set up Xrandr with the open-source Radeon driver?

TheOneKEA · 04-29-2015, 09:58 PM

I just recently used apt-get dist-upgrade to upgrade my x86_64 Debian install to jessie (8.0). So far, I have not been able to get my Xorg.conf configured to span my desktop across both of my monitors.

I have an ATi Radeon HD7770 with a pair of Samsung 1680x1050 monitors. One monitor is using the DVI port and should be the left-hand monitor (starting point 1680x1050+0+0) and the other monitor is using the HDMI port and should be the right-hand monitor (1680x1050+1680+0). Despite my best efforts so far, when X is started up it duplicates the left-hand monitor onto the right-hand monitor, and I have to use this command to fix it:

Code:

xrandr --screen 0 --output HDMI-0 --right-of DVI-0

Here is my current xorg.conf:

Code:

Section "ServerLayout"
        Identifier     "Custom Configured"
        Screen      0  "LeftScreen" 0 0
        Option      "Xinerama" "off"
        Option      "AIGLX" "on"
EndSection

Section "ServerFlags"
        Option      "Xinerama" "disabled"
EndSection

Section "Module"
EndSection

Section "Monitor"
        Identifier  "DVI-0"
        Option      "VendorName" "Samsung"
        Option      "ModelName" "SyncMaster 2200WM"
        Option      "DPMS" "true"
        Option      "PreferredMode" "1680x1050"
        Option      "TargetRefresh" "60"
        Option      "Rotate" "normal"
        Option      "Disable" "false"
EndSection

#Section "Monitor"
#       Identifier  "HDMI-0"
#       Option      "VendorName" "Samsung"
#       Option      "ModelName" "SyncMaster 2200WM"
#       Option      "DPMS" "true"
#       Option      "PreferredMode" "1680x1050"
#       Option      "TargetRefresh" "60"
#       Option      "Rotate" "normal"
#       Option      "Disable" "false"
#EndSection

Section "Device"
        Identifier  "HD7770-1"
        Driver      "radeon"
        VendorName  "ATi Technologies Inc"
        BoardName   "Radeon HD 7770"
        BusID       "PCI:5:0:0"
        Screen      0
EndSection
Section "Device"
        Identifier  "HD7770-2"
        Driver      "radeon"
        VendorName  "ATi Technologies Inc"
        BoardName   "Radeon HD 7770"
        BusID       "PCI:5:0:1
        Screen      1   
        Option      "ZaphodHeads" "HDMI-0"
EndSection

Section "Screen"
        Identifier "LeftScreen"
        Device     "HD7770-1"
        Monitor    "DVI-0"
        DefaultDepth     24
        SubSection "Display"
                ViewPort  0 0
                Virtual   3360 1050
                Depth     24
        EndSubSection
EndSection
#Section "Screen"
#       Identifier "RightScreen"
#       Device     "HD7770-2"
#       Monitor    "HDMI-0"
#       DefaultDepth     24
#       SubSection "Display"
#               Virtual   1680 1050
#               Depth     24
#       EndSubSection

I can supply lspci, Xorg.0.log and dmesg snippets if needed.

business_kid · 04-30-2015, 03:37 AM

Have you tried just giving it the one 'Virtual' instruction? You have two above

Code:

Virtual 3360 1050

zangxuma · 04-30-2015, 03:55 AM

thank you i think so

TheOneKEA · 05-05-2015, 08:28 PM

Quote:

Originally Posted by business_kid

Have you tried just giving it the one 'Virtual' instruction? You have two above

Code:

Virtual 3360 1050

Yes, I tried that. It ended up breaking things worse - I ended up with a blank left monitor and a messed up right monitor with corrupted fonts.

The only way to fix it was to go back to the config file produced by X -configure, which still causes my desktop to start up duplicated across both monitors.