macOS Catalina 10.15.4 Display Issue

Discussion in 'Mac OS X Guest OS Discussion' started by BenJ2, Apr 21, 2020.

  1. BenJ2

    BenJ2 Bit Poster

    Messages:
    5
    Hi,
    Odd issue has started recently with my macOS Catalina 10.15.4 guest in Parallels. The display does not render cleanly any more; it is always slightly blurred like the display has been slightly stretched and Parallels Tools has failed to compensate properly. I believe the issue may have started after updating to 10.15.4 (from 10.15.3) recently, but I'm not 100% sure.

    I've tried to attach a short video to highlight what I'm talking about but it was apparently too large (4.2M). The summary is:
    - Start the VM: Catalina boots and I get the login screen with black bars either side (understandable at this point)
    - Login: After login the guest display resizes to fill the window and I can see Parallels Tools does adjust the resolution to display properly, but around 1 second later that change gets reversed for some reason and the screen displays in the slightly stretched/distorted way I described earlier.

    I have already tried reinstalling Parallels Tools, but that did not solve the problem.

    My environment:
    macOS Catalina 10.15.4 (Host)
    MacBook Pro 13", 2016, Four thunderbolt 3 ports, 2.9GHz Dual-Core i5, 16G Memory
    Parallels Desktop 15 Pro Edition, 15.1.3 (47255)

    Thanks for any assistance.
    Ben.
     
  2. PatrickR9

    PatrickR9

    Messages:
    1
    I am having the exact same issue. The symptoms occur when attempting to enter coherence mode as well, the MacOS guest reverts after 2 to 5 seconds. Other virtual guests(Ubuntu, Windows) are working as expected.

    My environment:
    macOS Catalina 10.15.4 (Host)
    macOS Catalina 10.15.4 (Guest)
    MacBook Pro 13", 2019, Two thunderbolt 3 ports, 1.4 GHz Quad-Core Intel Core i5, 16G Memory
    Parallels Desktop 15 Pro Edition, 15.1.4 (47270)
     
  3. MarkH14

    MarkH14 Bit Poster

    Messages:
    4
    Similar problem: can't rescale the Catalina VM. Whenever I drag to increase the window size the Catalina VM increases in size, the video resolution is rescaled, then 2-3 second later it jumps back to the original windows size/ video resolution. My mojave VM does not have this problem.

    I started to notice this right after installing the previous to last update (parallels just updated to 15.1..4 47270). Which was also when I installed the Catlina VM
     
  4. iosm

    iosm Bit Poster

    Messages:
    8
    I pay my subscription every year and expect at least some kind of investigation into a problem that has been repeatedly happing for 3 years now. Not happy.
     
  5. iosm

    iosm Bit Poster

    Messages:
    8
    thanks my issue has been fixed.
     
  6. MarkH14

    MarkH14 Bit Poster

    Messages:
    4
     
  7. MarkH14

    MarkH14 Bit Poster

    Messages:
    4
    forgot a couple of brackets in my last post :)
     

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