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GUI responds slowly only on some systems.



  • Hi, using debian jessie system to install pyqt5==version5.12.3 GUI. On one similar system the GUI works fast without any issues.

    On another system, the GUI is super slow - unsure of why it could be so?

    On BOTH systems, i do get a warning (but this does not impact functionality):

    qt.qpa.xcb: failed to initialize XRandr
    qt.qpa.xcb: X server does not support XInput 2
    Fontconfig warning: line 146: blank doesn't take any effect anymore. please remove it from your fonts.conf
    qt.qpa.xcb: QXcbConnection: XCB error: 1 (BadRequest), sequence: 169, resource id: 53, major code: 131 (Unknown), minor code: 47
    

    Since this message is seen on BOTH systems, I do not think this has anything to do with the slowness.

    Any insight/tips?


  • Lifetime Qt Champion

    Hi,

    Can you list the differences between these systems ?



  • Failing System Info:

    description: Computer
        width: 64 bits
        capabilities: smbios-2.7 vsyscall32
      *-core
           description: Motherboard
           physical id: 0
         *-memory
              description: System memory
              physical id: 0
              size: 15GiB
         *-cpu
              product: Intel(R) Core(TM) i7-4820K CPU @ 3.70GHz
              vendor: Intel Corp.
              physical id: 1
              bus info: cpu@0
              size: 1296MHz
              capacity: 3900MHz
              width: 64 bits
    
    

    Passing System Info

    description: Computer
        width: 64 bits
        capabilities: smbios-2.8 vsyscall32
      *-core
           description: Motherboard
           physical id: 0
         *-memory
              description: System memory
              physical id: 0
              size: 62GiB
         *-cpu
              product: Intel(R) Core(TM) i5-9600K CPU @ 3.70GHz
              vendor: Intel Corp.
              physical id: 1
              bus info: cpu@0
              size: 4343MHz
              capacity: 4600MHz
              width: 64 bits
         
    
    

  • Lifetime Qt Champion

    What about the graphics stack ?



  • I see.

    On failling system:

    *-display               
           description: VGA compatible controller
           product: GeForce GTX 750 Ti
           vendor: NVIDIA Corporation
           physical id: 0
           bus info: pci
           version: a2
           width: 64 bits
           clock: 33MHz
           
      *-display
           description: 3D controller
           product: NVIDIA Corporation
           vendor: NVIDIA Corporation
           physical id: 0
           bus info: pci
           version: a1
           width: 64 bits
           clock: 33MHz
      
    
    

    On passing system:

     *-display               
           description: VGA compatible controller
           product: NVIDIA Corporation
           vendor: NVIDIA Corporation
           physical id: 0
           bus info: pci
           version: a1
           width: 64 bits
           clock: 33MHz
      *-display
           description: VGA compatible controller
           product: NVIDIA Corporation
           vendor: NVIDIA Corporation
           physical id: 0
           bus info: pci
           version: a1
           width: 64 bits
           clock: 33MHz
    
    
    

  • Lifetime Qt Champion

    Not using the same drivers ?


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