GUI: The curser is heavily lagging if GSync is set to windowed and full screen mode #94493
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Reference: blender/blender#94493
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System Information
Operating system: Windows-11-10.0.22000-SP0 64 Bits
Graphics card: NVIDIA GeForce RTX 2080 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 497.29
Blender Version
Broken: version: Blender 2.79b up to Blender 3.0.0, branch: master, commit date: 2021-12-02 18:35, hash:
f1cca30557Short description of error
Everything is as expected if the mode is set to "Fullscreen only" (the default)
But as soon as you set to it to "Window- and Fullscreen mode" the mouse curser will lag heavily.
Exact steps for others to reproduce the error
Workaround
Just set it back to full screen mode only.
OR
If you go to nVidia Control Panel > Manage 3d Settings > Program Settings.
Add Blender under Select Program To Customize. Changing to the following settings can fix it:
Monitor Technology: Fixed Refresh
Preferred Refresh Rate: Application-controlled
Desired behavior
A fluid curser on the screen even with "windowed and full screen mode" enabled
Added subscriber: @Raimund58
UI: The curser is heavily lagging if GSync is set to windowed and full screen modeto GUI: The curser is heavily lagging if GSync is set to windowed and full screen modeAdded subscriber: @chemicalcrux
Just copying some stuff from the chat here:
This has been an issue for other programs in the past; see https://github.com/microsoft/terminal/issues/649 for a discussion about Windows Terminal.
If the window is updating (e.g. if you're rotating the view around), then the mouse looks fine, since the display is refreshing rapidly.
Added subscriber: @PratikPB2123
Hi @Raimund58 , are you using High refresh rate monitor (as said in the bug report )?
I read few comment from that report and issue maybe same as yours.
Are you experiencing this only in Blender?
Yes, I use the 144 hz mode. The monitor is the ASUS ROG Swift PG278QR 68,68 cm (27 Zoll).
I only experienced it in Blender so far. But it might happen in other programs as well.
Ok, thanks for the information :)
Please update here if you notice this issue in other software.
I'm not sure how to triage this report further. Will ask someone if they have similar setup to test.
Added subscriber: @Alaska
Changed status from 'Needs Triage' to: 'Confirmed'
I can confirm the issue on Windows 11 with a RTX 3060.
If I enable G-Sync for windowed applications, the "update rate" of the cursor is reduced while Blender is open and the active/main application. (For my system, the update rate of the cursor is reduced to 48 hertz. Presumably this value is picked based on the G-Sync capabilities described by the monitor)
I believe this might be happening as G-Sync adapts the refresh rate of the monitor to the frame rate of the application open. Because Blender doesn't re-draw the user interface unless it needs too, the frame rate of Blender is considered to be "quite low" and thus the GPU and monitor lowers it's refresh rate which results in the "laggy mouse cursor".
As for why Windows isn't doing something like "We're moving the mouse, increase the frame rate to the monitors maximum", I don't know. I don't know enough about how the Nvidia drivers with G-Sync interact with Blender and the Windows compositor.
Could this issue be fixed in Blender? Yes, force constant redraws of the UI.
Could this issue be fixed within Blender without forcing constant redraws of the UI? I have no idea. This will need to be looked at by someone else.
Does this issue happen with G-Sync on Linux? No, but this is because on Linux you can't enable G-Sync for windowed applications.
Added subscriber: @Gheromo
This comment was removed by @Gheromo
Update:
It is also happening in (Autodesk) AutoCAD Plant3D whenever I move the mouse to another interface (inside of AutoCAD).
I had to disable GSync completely to work around this bug.
Added subscriber: @TurkeyMan
+1
2080Ti, 165hz, GSYNC enabled; Blender is unusable. Disable gsync, it's fine.
Windows 11, all drivers up to date, etc.
Never seen this before on any other software. There must be some way other applications are addressing this...
I find it interesting that the solution to this issue exists online. Sadly I cannot find the original link. I have confirmed it works with blender and other programs that misbehave with gsync.
They are all windowed applications and this solution has worked every time with gsync ENABLED.
This is NOT a windows issue. It's poor driver implementation and configuration. Initialization values are set incorrectly by the geforce drivers by default.
Solution:
Nvidia Control Panel > 3D settings > Program Settings > Add: blender, then scroll down the menu and change Framerate Technology to Fixed Refresh Rate and Preferred Refresh Rate to Maximum Available.
Close Blender.
Revert the previously changed options for blender in nvidia control panel.
Open Blender. It now works lag free with gsync.
Nvidia is at fault here. They've been getting away with not fixing their drivers because people have been disabling gsync and assuming it's windows. The drivers are simply initializing settings incorrectly.