G-SYNC works in windowed mode even disabled and causes stuttering/flickering

[panicaz]

I have experienced this as well, but toggling G-Sync on and back off has fixed it for me.

This was the first obvious solution I tried.

Today I installed old Windows 10 1909 on a separate SSD and G-sync works totally fine. No VRR trigger in windowed mode if disabled in NVCP. So the problem is most likely in Windows 10 updates somwere between 1909 and 22H2 version.

Any thoughts about fixing it on modern version of Windows 10?

[Kyouki]

Hmmm maybe full-screen optimizations stuff. Though I am not entirely sure how this works yet.

Just happen to know around those versions that got introduced.

[jorimt]

I have experienced this as well, but toggling G-Sync on and back off has fixed it for me.

This was the first obvious solution I tried.

Today I installed old Windows 10 1909 on a separate SSD and G-sync works totally fine. No VRR trigger in windowed mode if disabled in NVCP. So the problem is most likely in Windows 10 updates somwere between 1909 and 22H2 version.

Any thoughts about fixing it on modern version of Windows 10?

May or may not be MPO-related (effectively makes some windowed apps act more like exclusive fullscreen when focused):
https://nvidia.custhelp.com/app/answers ... er-version

Nvidia offers a regedit to disable MPO:
https://nvidia.custhelp.com/app/answers ... /a_id/5157

You can attempt the regedit on your original drive (containing the newer version of Windows) to see whether that resolves your particular issue.

[Kyouki]

I have experienced this as well, but toggling G-Sync on and back off has fixed it for me.

This was the first obvious solution I tried.

Today I installed old Windows 10 1909 on a separate SSD and G-sync works totally fine. No VRR trigger in windowed mode if disabled in NVCP. So the problem is most likely in Windows 10 updates somwere between 1909 and 22H2 version.

Any thoughts about fixing it on modern version of Windows 10?

May or may not be MPO-related (effectively makes some windowed apps act more like exclusive fullscreen when focused):
https://nvidia.custhelp.com/app/answers ... er-version

Nvidia offers a regedit to disable MPO:
https://nvidia.custhelp.com/app/answers ... /a_id/5157

You can attempt the regedit on your original drive (containing the newer version of Windows) to see whether that resolves your particular issue.

Read about this about a week ago, though didn't consider this one as a valid solution -- did this change per those versions? (if you know)

[jorimt]

Read about this about a week ago, though didn't consider this one as a valid solution -- did this change per those versions? (if you know)

MPO support for Nvidia GPUs was introduced in driver version 461.09. I don't know what Windows 10 version introduced it at the OS-level off-the-top-of-my-head though.

Again, it may or may not be the culprit, but worth a shot.

[panicaz]

May or may not be MPO-related (effectively makes some windowed apps act more like exclusive fullscreen when focused):
https://nvidia.custhelp.com/app/answers ... er-version

Nvidia offers a regedit to disable MPO:
https://nvidia.custhelp.com/app/answers ... /a_id/5157

You can attempt the regedit on your original drive (containing the newer version of Windows) to see whether that resolves your particular issue.

Yep! This works. Disabling MPO fixes stuttering and flickering with G-SYNC enabled.

Thanks you guys for help!

[jorimt]

Yep! This works. Disabling MPO fixes stuttering and flickering with G-SYNC enabled.

Thanks you guys for help!

Nice.

[Kyouki]

Yep! This works. Disabling MPO fixes stuttering and flickering with G-SYNC enabled.

Thanks you guys for help!

Nice.

Cool, thanks.

Also cool it worked out. I'll remember that one for nexttime someone has the issue.

[progamingnoob]

May or may not be MPO-related (effectively makes some windowed apps act more like exclusive fullscreen when focused):
https://nvidia.custhelp.com/app/answers ... er-version

Nvidia offers a regedit to disable MPO:
https://nvidia.custhelp.com/app/answers ... /a_id/5157

You can attempt the regedit on your original drive (containing the newer version of Windows) to see whether that resolves your particular issue.

Yep! This works. Disabling MPO fixes stuttering and flickering with G-SYNC enabled.

Thanks you guys for help!

- same this regedit just fixed everything, my mw2 benchmark score didn't change, my 3080 is cranking out frames in mw2 again, almost consistantly 277 fps the whole time with no stutters or dips (im using 3x monitors btw idk if that matters)

- also just googling mpo it seems like the amd guys are using this tweak a lot

[Eian]

Ok, so I just found a really strange workaround for this issue without disabling MPO.
I’m using two monitors with G-SYNC set to “fullscreen apps only,” yet I still get the G-SYNC indicator on my main monitor
when using windowed apps like Viber and a few others.
Both monitors are the same 180Hz G-SYNC compatible models, but this only happens on the main one.

Now here’s the weird part:
If I go into the NVIDIA Control Panel, add the Viber app, change Monitor Technology to Fixed Refresh Rate, click Apply,
and then switch everything back to Use Global Setting (exactly as it was before), G-SYNC stops activating.

I have no idea how that even works, but I’m guessing this changes additional hidden driver flags
beyond just Preferred Refresh Rate and Vertical Sync that aren’t shown in the Control Panel.
If I remove the app from the list, the issue comes back again..

NVidia Control Panel.png (91.71 KiB) Viewed 1030 times