Multi-head with different resolutions, "fullscreen" uses wrong resolution

sleeping · 03-06-2011, 08:07 PM

(Using ArchLinux with KDE)

My desktop has two monitors. The first one (on the left) has a resolution of 1600x1200. The second one (on the right) has a resolution of 1360x768.

Using the nvidia-settings tool, I set my second monitor to act as a separate X screen. Here is the resulting xorg.conf file :

Code:

# nvidia-settings: X configuration file generated by nvidia-settings
# nvidia-settings:  version 260.19.36  (buildmeister@swio-display-x86-rhel47-01.nvidia.com)  Tue Jan 18 17:15:10 PST 2011

Section "ServerLayout"
    Identifier     "Layout0"
    Screen      0  "Screen0" 0 0
    Screen      1  "Screen1" RightOf "Screen0"
    InputDevice    "Keyboard0" "CoreKeyboard"
    InputDevice    "Mouse0" "CorePointer"
    Option         "Xinerama" "0"
EndSection

Section "Files"
EndSection

Section "InputDevice"
    # generated from default
    Identifier     "Mouse0"
    Driver         "mouse"
    Option         "Protocol" "auto"
    Option         "Device" "/dev/psaux"
    Option         "Emulate3Buttons" "no"
    Option         "ZAxisMapping" "4 5"
EndSection

Section "InputDevice"
    # generated from default
    Identifier     "Keyboard0"
    Driver         "kbd"
EndSection

Section "Monitor"
    # HorizSync source: edid, VertRefresh source: edid
    Identifier     "Monitor0"
    VendorName     "Unknown"
    ModelName      "Samsung SyncMaster"
    HorizSync       30.0 - 81.0
    VertRefresh     56.0 - 75.0
    Option         "DPMS"
EndSection

Section "Monitor"
    # HorizSync source: edid, VertRefresh source: edid
    Identifier     "Monitor1"
    VendorName     "Unknown"
    ModelName      "PRI BBY LCD TV"
    HorizSync       30.0 - 80.0
    VertRefresh     55.0 - 76.0
    Option         "DPMS"
EndSection

Section "Device"
    Identifier     "Device0"
    Driver         "nvidia"
    VendorName     "NVIDIA Corporation"
    BoardName      "GeForce 8500 GT"
    BusID          "PCI:1:0:0"
    Screen          0
EndSection

Section "Device"
    Identifier     "Device1"
    Driver         "nvidia"
    VendorName     "NVIDIA Corporation"
    BoardName      "GeForce 8500 GT"
    BusID          "PCI:1:0:0"
    Screen          1
EndSection

Section "Screen"
    Identifier     "Screen0"
    Device         "Device0"
    Monitor        "Monitor0"
    DefaultDepth    24
    Option         "TwinView" "0"
    Option         "metamodes" "DFP: nvidia-auto-select +0+0"
    SubSection     "Display"
        Depth       24
    EndSubSection
EndSection

Section "Screen"
    Identifier     "Screen1"
    Device         "Device1"
    Monitor        "Monitor1"
    DefaultDepth    24
    Option         "TwinView" "0"
    Option         "metamodes" "CRT: 1360x768 +0+0"
    SubSection     "Display"
        Depth       24
    EndSubSection
EndSection

When I launch an application on the second screen, and I make it "fullscreen" (either by clicking on the appropriate button on the title bar, or with "wmctrl -x -r MyWindow.MyWindow -b toggle,fullscreen"), the application gets resized to 1600x1200, even though it is on the 1360x768 screen.

What is odd is that calling xwininfo on the root window of the second screen gives a geometry of 1360x768, but calling xprop on the root window of the second screen gives a _NET_DESKTOP_GEOMETRY value of 1600x1200. I suppose "fullscreen" uses _NET_DESKTOP_GEOMETRY to figure out the size to take, but that size is wrong.

Code:

[user@host ~]$ DISPLAY=:0.1 xwininfo -root
xwininfo: Window id: 0x293 (the root window) (has no name)

  Absolute upper-left X:  0
  Absolute upper-left Y:  0
  Relative upper-left X:  0
  Relative upper-left Y:  0
  Width: 1360
  Height: 768
  Depth: 24
  Visual: 0x157
  Visual Class: TrueColor
  Border width: 0
  Class: InputOutput
  Colormap: 0x156 (installed)
  Bit Gravity State: NorthWestGravity
  Window Gravity State: NorthWestGravity
  Backing Store State: NotUseful
  Save Under State: no
  Map State: IsViewable
  Override Redirect State: no
  Corners:  +0+0  -0+0  -0-0  +0-0
  -geometry 1360x768+0+0

[user@host ~]$ DISPLAY=:0.1 xprop -root
KWIN_RUNNING(KWIN_RUNNING) = 0x1
_NET_CLIENT_LIST_STACKING(WINDOW): window id # 0x2000043
_NET_CLIENT_LIST(WINDOW): window id # 0x2000043
_NET_SHOWING_DESKTOP(CARDINAL) = 0
_NET_DESKTOP_GEOMETRY(CARDINAL) = 1600, 1200
_NET_DESKTOP_VIEWPORT(CARDINAL) = 0, 0, 0, 0, 0, 0, 0, 0
_NET_WORKAREA(CARDINAL) = 0, 0, 1600, 1200, 0, 0, 1600, 1200, 0, 0, 1600, 1200, 0, 0, 1600, 1200
_NET_ACTIVE_WINDOW(WINDOW): window id # 0x0
_NET_CURRENT_DESKTOP(CARDINAL) = 1
_NET_DESKTOP_NAMES(UTF8_STRING) = "Desktop 1", "Desktop 2", "Desktop 3", "Desktop 4"

(snip)

How can I either change _NET_DESKTOP_GEOMETRY to the proper value, or have a fullscreen feature that uses the correct resolution?

bluebox · 03-06-2011, 10:55 PM

uhm ... "metamodes" in the Screen Section doesn't look right to me. This could reactivate some kind of TwinView. Try "Modes" instead, see here for a template:

ftp://download.nvidia.com/XFree86/Li...ppendix-p.html

Is the 1360x768 monitor scrolling/panning within 1600x1200?

Does switching screenmodes help? (on either of the screens)

Setting the window to right position/size instead of "fullscreen" via wmctrl would be a workaround.

sleeping · 03-12-2011, 09:46 PM

Quote:

Originally Posted by bluebox

uhm ... "metamodes" in the Screen Section doesn't look right to me. This could reactivate some kind of TwinView. Try "Modes" instead, see here for a template:

ftp://download.nvidia.com/XFree86/Li...ppendix-p.html

Is the 1360x768 monitor scrolling/panning within 1600x1200?

Does switching screenmodes help? (on either of the screens)

Setting the window to right position/size instead of "fullscreen" via wmctrl would be a workaround.

I tried changing metamodes to Modes, and the result is the same. The monitors aren't panning, i.e. I can't move a window from one to the next, they really are two separate X screens, so no TwinView at all.

While setting the window to the right position/size with wmctrl might work for most applications, there are some where it's fullscreen or nothing. For example, playing a YouTube video fullscreen, the flash player will try to get a 1600x1200 resolution on the 1360x768 screen.

bluebox · 03-13-2011, 10:32 AM

Quote:

For example, playing a YouTube video fullscreen, the flash player will try to get a 1600x1200 resolution on the 1360x768 screen.

Yes, of course ... this is annoying.

Have a look at /var/log/Xorg.0.log and try to figure out, where the 1600x1200 does come from.

Try mode-switching - with Ctrl-Alt _and_ xrandr. Switch away from 1360x768 and back to 1360x768 with any combination of Ctrl-Alt and xrandr and test whether the problem persists. Try switching the main monitor to 1360x768 and see whether this does help.

I suppose, there is some virtual screen problem ...