Windows 7 Forums
Welcome to Windows 7 Forums. Our forum is dedicated to helping you find support and solutions for any problems regarding your Windows 7 PC be it Dell, HP, Acer, Asus or a custom build. We also provide an extensive Windows 7 tutorial section that covers a wide range of tips and tricks.

Windows 7: dwm.exe causing windows aero flickering issues

22 Mar 2017   #1

win 7 64 bit
dwm.exe causing windows aero flickering issues

For some reason dwm.exe is now causing windows aero flickering issues in win 7 64 bit. When i mouse over an icon on the taskbar and the preview window pops up, after a few seconds there will be a split second flicker and the preview window will dissapear. When this happens, dwm.exe in task manager goes from 1% cpu usage to 0%, and then back to 1%.

This is aero specific and has nothing to do with my graphics card, etc. I have an intel HD 4600/GTX 770M, i can run furmark, etc with no issues.

Tried latest graphics drivers, same issue. Downgraded to last known good drivers, same issue.

sfc /scannow shows no issues.

Stopping/restarting the dwm service doesnt do anything.

GPU speeds all seem normal.

The windows aero troubleshooter finds no issues.

There are no errors in event viewer nor am i getting any error messages or popups at all.

There is no overheating. Mem/CPU usage is all fine except for dwm.exe dropping to 0% for a split second which seems to be causing the problem, but priority is already set to high and changing it to realtime or normal doesnt fix the problem.

This seems to be a similar issue : Flickering windows, when Online... Games and Net Browsers, but there is no solution.

I can disable aero, but thats just a workaround and doesnt solve the issue with aero flickering. There is absolutely no flickering or anything when aero is disabled.

I already have nvidia control panel and power options set to run at max performance.

Laptop is a clevo p15sm.

Anyone have any ideas? Is there a way to reinstall dwm.exe or the associated files without reinstalling windows from scratch?

Edit : Interestingly, as long as i have the DWM service (and process) running, even if i run a program with "disable desktop composition" which sets windows to the basic theme (and therefore, not running in aero), the screen flicker still occurs...and it stops immediately once i disable the service.

My System SpecsSystem Spec
22 Mar 2017   #2

win 7 64 bit

Fixed : Windows 7 - window Flicker (Not screen) poor mouse response (Aero?)

The culprit was this registry script : Desktop and Shutdown Tweaks Combined[2]=Performance%20Maintenance

Specifically that HungAppTimeout and other values were set to 1000 ms (1 second) which were causing the screen flicker. I changed them all to 3000 and it works fine now.

That script should probably be removed from the tutorial section.
My System SpecsSystem Spec
22 Mar 2017   #3

64-bit Windows 10 Pro

My System SpecsSystem Spec


 dwm.exe causing windows aero flickering issues

Thread Tools

Similar help and support threads
Thread Forum
Screen flickering/glitching - Aero not supported?
my screen has been flickering/glitching for a few weeks not, not sure whats up. it only happens once every so often but multiple times a day, it lasts for a half a second maybe, it doesnt do it when i'm gaming just usually when i'm at or around the desktop/browsing the web. i did a bit of searching...
Graphic Cards
aero causing windows to minimize
hello folks ive got a problem and for the love of pie, cant find the option to stop is for find out if its a bug. ive tried googling. Aero is causing windows to minimize appearently randomly Does anyone know the reason? Regards
General Discussion
OCZ ram compatibility causing screen flickering
I have 4x2GB OCZ Platinum DDR2 PC2-8500 1066Mhz Ram. Currently when I run 8GB it causes screen flickering in games, when using 4GB it is fine. I will try 6GB ram today. Check my system specs in the tab for more info on PC build. Thanks
Hardware & Devices
Aero peek mouse-over thumbnails are flickering
So here is my issue: my aero peek thumbnails don't stay up, as I move my mouse over the active icon, it shows and then disappears. It flickers as my mouse moves across the icon. But when I click the explorer bar itself and then mouse over my active icon, it *will* show. I've tried to...
General Discussion
GMA 500 drivers causing issues in Windows 7
So, I installed Windows 7 RC today on my Dell Mini 10 and everything was smooth sailing. At this point my only available resolution was 800x576. Windows Updates picked up a couple of drivers, one being the Intel GMA 500 drivers. I installed the drivers and the system restarts. The restart...

Our Sites

Site Links

About Us

Find Us

Windows 7 Forums is an independent web site and has not been authorized, sponsored, or otherwise approved by Microsoft Corporation. "Windows 7" and related materials are trademarks of Microsoft Corp.

Designer Media Ltd

All times are GMT -5. The time now is 07:56.
Twitter Facebook Google+ Seven Forums iOS App Seven Forums Android App