Parallels 5 / Windows 7: short screen blackout every few minutes

Discussion in 'Windows Guest OS Discussion' started by rft, Nov 5, 2009.

  1. rft

    rft

    Messages:
    31
    I have installed Parallels 5 (9220) yesterday, and use it
    with Windows 7 in full screen mode (no coherence, no
    boot camp) on a MacBook Pro 17.
    Nearly everything works OK, however there is one a bit annoying
    issue:

    Every few minutes the screen gets black for a second or two
    and then the whole screen is redrawn (i.e. the app windows are
    visibly refreshed). Everything continues to work, but this bug
    is a bit annoying since it randomly appears without warning...

    Has anyone seen this, and if yes, found out how to avoid it?

    Greetings,
    -- Robert
     
  2. iMac

    iMac

    Messages:
    7
    I´m also having the same issue. Parallels 5, Windows 7 under iMac with OS X 10.6.1

    Regards
     
  3. iMac

    iMac

    Messages:
    7
    The same problems here. iMac7,1. 4GB. ATI RadeonHD2600. OS X 10.6.1

    Regards
     
  4. ja3

    ja3 Bit Poster

    Messages:
    4
    I have the same issue with a Macbook Pro (10.6.1).

    I have tested it with windows 7 x64 on a virtual image and with the bootcamp partition. Both give me the same result.
     
  5. wdcurry

    wdcurry

    Messages:
    33
    same here for my vista VM..
     
  6. 17maf

    17maf

    Messages:
    1
    Same here,

    MacPro 2.1 Snow Leopard ATI 3870
    Guest Win7 64
     
  7. quad

    quad

    Messages:
    6
    Latest 17" MBP - same issue with W7 and aero...

    I was a beta tester and reported this error to them during trials. Unfortunately, does not appear to have been fixed.
    Fusion has aero but is much slower than Parallels but does not suffer this problem.
    Tried switching between the different GPUs in the MBP but same issue occurs.
    Eventually, the VM session aborts on aero and permanently displays non-aero windows. You have to go through the "fix aero" to bring it back.
    Have noticed the blackouts in co-herence mode as well (windows go black and are redrawn). Also when in co-herence mode with Aero, the primary window appears to be placed over a grey backdrop (and not the desktop picture associated with Windows 7's desktop). Fusion displays the primary window correctly. Parallels does not and you see grey around the window perimeter (mainly the window corners).
    artifacting

    Andrew
     
  8. quad

    quad

    Messages:
    6
    Solution

    Reduce VRAM in settings to 128MB. Seemed to have solved the problem so far.
     
  9. ingaI

    ingaI

    Messages:
    6
    Same Problem here, MACPro on OSX 10.6.1. Reducing VRAM to 128 MB
    makes the effect appear less often, but blank screens still coming up.
     
  10. rft

    rft

    Messages:
    31
    Reducing VRAM to 128MB did NOT help...

    @quad:

    I reduced the VRAM in the settings to 128MB, as per your recommendation, but
    this did not help.

    This bug exists from the beta version.

    Greetings,
    -- Robert
     
  11. serv

    serv Parallels Developers

    Messages:
    810
  12. iMac

    iMac

    Messages:
    7
    Reduced VRAM to 128MB. Didn´t resolve it. The problems still happen...
    Regards
     

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