Screen problems after a Mac sleep

Discussion in 'Windows Guest OS Discussion' started by RogerH6, May 2, 2017.

  1. RogerH6

    RogerH6 Kilo Poster

    I remember seeing a thread a while ago with possibly similar problems, but can't at the moment locate it.

    Basically if I leave the machine 'idle' for a while, so the Mac has gone to sleep, and then return, sometimes I'm seeing strange display behaviour from the virtual machine.
    W10. Two versions (W32 Anniversary and W64 Creators).
    I'm running an i7 27" 2017 iMac 32GB/3TB (fusion). Retina display.
    Second screen is a Dell Ultrasharp 25" on the displayport. I'm running the Windows on this.
    Parallels 'sees' that I have a Retina main display, and defaults to setting the resolution to 5120*2804 (running a window to fill the screen, but not running 'full screen'). The monitor though is only 2560*1440. So Parallels is getting confused about the actual resolution available (though things display correctly)....

    Real problem though, comes when the Mac sleeps.
    Fault seems to be worse the more windows that are open on the Windows desktop.
    After the return things redraw very slowly, and depending where the cursor is. So if you open the explorer window for example, it comes up 'empty', and if you then move the cursor across it, parts are displayed as the cursor crosses the window. Reboot, and it's OK again till the next sleep.

    Now if I change the Parallels settings and turn off '3D acceleration' completely, it does not happen. WDDM driver loads, screen performance is less good, but works fine.
    If I select DX9, W10 disables the Parallels WDDM driver, and still works OK.
    If I select DX10, the WDDM driver loads OK, but the problem appears. Performance though is better till the problem appears.
    Suspect trying to handle this massive (non existent...) resolution is causing the problem.

  2. RogerH6

    RogerH6 Kilo Poster

    Disabling the 'pause windows when possible' button seems to have fixed it.
    I think it is pausing itself, and hiccuping one of the attached USB devices, which then makes the system grind.
    Choosing the option to optimise the display for external screens made the resolution go to sensible values.
    The Mac itself sleeping, does not seem to cause a problem.
  3. PaulChris@Parallels

    PaulChris@Parallels Product Expert Parallels Support

    That's great! @Roger Please let us know if you have any issue with the product and we are here to help!
  4. RyanS8

    RyanS8 Bit Poster

    I am also having the screen redraw issue after waking the MBP up. It also happens when parallels moves from the laptop screen to an external monitor when plugging in the monitor.

    FYI, I do not have the 'Pause Windows' checkbox selected.
    Last edited: Sep 13, 2017

Share This Page