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  1. Qt
  2. QTBUG-40429

QScreen::virtualSiblings() and QDesktopWidget::isVirtualDesktop() not working with Xinerama.

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    Description

      Test using the proprietary drivers supplied with the Ubuntu 14.04
      distribution. Nvidia X server settings correctly recognizes both cards. Using NVIDIA driver 331.38.

      When I put it in Xinerama mode, all screens are active, but the VirtualDeskop returns false with only 1 large screen.

      Did nothing special with Xinerama except enabling it in the Nvidia X
      server settings. Using a Dell monitor and three attached Optoma projectors for my virtual desktop.

      Set up a 2-monitor configuration with Xinerama turned on. See if it returns only 1 screen when querying for number of screens. Number of virtual siblings should be more than one.

      1) uname -a
Linux [MachineNameRemoved] 3.13.0-24-generic #46-Ubuntu SMP Thu Apr 10 19:11:08 UTC 2014
x86_64 x86_64 x86_64 GNU/Linux

2) lspci | grep VGA
03:00.0 VGA compatible controller: NVIDIA Corporation GF110 [GeForce GTX 580]
(rev a1)
04:00.0 VGA compatible controller: NVIDIA Corporation GK107 [NVS 510] (rev a1)

BTW, in my example, all screens are on NVS510.

3) sudo lshw -C video
*-display
description: VGA compatible controller
product: GF110 [GeForce GTX 580]
vendor: NVIDIA Corporation
physical id: 0
bus info: pci@0000:03:00.0
version: a1
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress vga_controller bus_master cap_list rom
configuration: driver=nvidia latency=0
resources: irq:91 memory:f8000000-f8ffffff memory:c0000000-c7ffffff
memory:cc000000-cdffffff ioport:8c00(size=128) memory:f9f00000-f9f7ffff
*-display
description: VGA compatible controller
product: GK107 [NVS 510]
vendor: NVIDIA Corporation
physical id: 0
bus info: pci@0000:04:00.0
version: a1
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress vga_controller bus_master cap_list rom
configuration: driver=nvidia latency=0
resources: irq:90 memory:fa000000-faffffff memory:d0000000-dfffffff
memory:ce000000-cfffffff ioport:9c00(size=128) memory:fb800000-fb87ffff

4) X -version
X.Org X Server 1.15.1
Release Date: 2014-04-13
X Protocol Version 11, Revision 0
Build Operating System: Linux 3.2.0-37-generic x86_64 Ubuntu
Current Operating System: Linux [MachineNameRemoved] 3.13.0-24-generic #46-Ubuntu SMP
Thu Apr 10 19:11:08 UTC 2014 x86_64
Kernel command line: BOOT_IMAGE=/boot/vmlinuz-3.13.0-24-generic
root=UUID=[UUIDREMOVED] ro quiet splash vt.handoff=7
Build Date: 16 April 2014 01:36:29PM
xorg-server 2:1.15.1-0ubuntu2 (For technical support please see
http://www.ubuntu.com/support)
Current version of pixman: 0.30.2
Before reporting problems, check http://wiki.x.org
to make sure that you have the latest version.

      Attached xorg.conf file Note: this is with Xinerama turned off.

      Attachments

        1. qtdiag.log
          4 kB
        2. XineramaTest.tar.gz
          0.8 kB
        3. xorg.conf
          3 kB

        Issue Links

          relates to

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-48615 Different xinerama screens are detected as one huge virtual screen

          • P3: Somewhat important - Should be fixed, but doesn't affect the release in any way.
          • Closed
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              paeglis Gatis Paeglis
              leonlee Leonard Lee
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                Updated:
                Resolved:

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