Screen Flickering - Help :)

So I've changed some settings and thus far have not encountered further screen flickering! It's worked on my new 15" MBP w/ TB and my 27" iMac w/ 27" Thunderbolt Display. :)
15" MBP w/ TB (w/ 16GB RAM)
A. Parallels Hardware Tab:
  1. CPU & Memory: Set RAM to 6000 MB (6 GB to prevent memory swapping; it leaves MacOS with 10GB).
  2. Graphics:
    1. Set memory to 1000 MB
    2. Resolution: Check the "Scaled" box
B. Parallels Options Tab:
  1. Full Screen: "Scale to Fit Screen" = Off
C. In the running Guest OS (Windows 10, etc.), apply these settings:
  1. Set screen resolution to "1680 x 1050 (Recommended)"
  2. Advanced Text Sizing (Scaling) set to 100% (or scaling off)
27" iMac
All the same steps above, but in Guest OS (Windows 10), Set screen resolution to "2560 x 1440 (Recommended)"

I can't say that this is the best or most preferred solution, but it seems to have solved screen flickering while leaving things at resolutions I can work with. Good luck!
 
Last edited:
BrianL7 said:
So I've changed some settings and thus far have not encountered further screen flickering! It's worked on my new 15" MBP w/ TB and my 27" iMac w/ 27" Thunderbolt Display. :)
15" MBP w/ TB (w/ 16GB RAM)
A. Parallels Hardware Tab:
  1. CPU & Memory: Set RAM to 6000 MB (6 GB to prevent memory swapping; it leaves MacOS with 10GB).
  2. Graphics:
    1. Set memory to 1000 MB
    2. Resolution: Check the "Scaled" box
B. Parallels Options Tab:
  1. Full Screen: "Scale to Fit Screen" = Off
C. In the running Guest OS (Windows 10, etc.), apply these settings:
  1. Set screen resolution to "1680 x 1050 (Recommended)"
  2. Advanced Text Sizing (Scaling) set to 100% (or scaling off)
27" iMac
All the same steps above, but in Guest OS (Windows 10), Set screen resolution to "2560 x 1440 (Recommended)"

I can't say that this is the best or most preferred solution, but it seems to have solved screen flickering while leaving things at resolutions I can work with. Good luck!
Click to expand...
Thanks for the suggestion, BrianL7, we will test it in our lab with the same environment and let you know the results.
 
I have got a Retina Mid 2014 with
NVIDIA GeForce GT 750M 2 GB
Intel Iris Pro 1536 MB
Graphics

since i have upgraded to V13 i also have got this awful screen flickerings ... i cannot exatcly say what the reason for this is. When i start Windows 10, evreything is okay. I am using 2 monitors with an adapter which is connected to the thunderbolt port. Maybe its the number of open applications and windows. Then it starts flickering (after 10 minutes up to 2 hours) and gets then worse very fast. Very bad when you try to move any windows or open/close apps. It leads very far to the situation that screen content is totally unreadable and that its only luck that you are able to identify the restart button on the screen. I also have this new effect that i first have a pink screen when i wake up my macbook. I really hope that the parallels team will find a solution for this. Up to now i had three times the situation that it was very hard to save my work before restarting, because screen content was not redable anymore ....

best regards
Sven
 
BrianL7 said:
My 2016 MacBook Pro Retina 15" w/ Touch Bar is 4 days old. I use Windows 10 VM in Parallel. Never had any issues until I performed Microsoft Office updates; specifically during the end of the installation process. It continued through to turning the VM off completely. Laptop plugged in and at 100%.

Parallel version 12 for Mac
Windows 10
MacBook Pro 15" 2016 w/Touchbar
2.7Ghz i7 | 16GB | 512GB SSD

Video: https://www.dropbox.com/s/h0glbpl0hvwlj95/Screen Flicker.mp4?dl=0
Click to expand...
I have the same exact issue since I upgraded to Parallels 13. I have sent a few videos to support, but have not received one reply. Happens at least a few times everyday. Suspending and resuming fixes the issues for a short period of time, but it always comes back.
 
Exactly the same problem since I upgraded to Parallels 13 . I check my version in order to install the latest one but it is suppose to be the last one (
Versión 13.2.0 (43213)).

Please help! any idea

Ramón
 
I have the same issue with PD13. None of the fixes here helped. Falling back to PD12 didn't help. Interestingly some Win10 VMs work great. Others won't stop flickering. Upgrading to PD13 was a really bad idea.
 
I've just managed to avoid a heavily blinking issue.
Problems began when I connected the second monitor. I've increased the amount of the virtual video memory as Parallels asked to 512M, but the performance was very bad anyway, so I've disconnected the second monitor. Parallels became unusable at this point: heavy blinking after logon. Steps taken to restore the functionality:

1. Increase video memory to 1M, virtual memory to 8G, acceleration off.
2. Blinking stopped, but VM was unusable: very slow.
3. It appeared that screen resolution in Windows was set to double on both dimensions (and the text size increased too, so the change was not obvious). That means that the screen size was 4 x normal: 5120 x 2880 instead of real 2560 x 1440.
4. Screen size in Windows restored to 2560 x 1440, text size changed to minimal.
5. No blinking, speed Ok.

Looks like adding the second monitor renders Parallels inoperable. Hope this helps.
 
I solved the problem of flickering with win10 on my 27-inch iMac using the virtual machine after selecting the "resized" function in the "graphics card" menu, losing the high-resolution graphics .. I have tried everything, but this is unique way to give resolution to flickering ..
 
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