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Old 10th September 2018, 20:09   #52373  |  Link
tij
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Join Date: Jun 2018
Posts: 9
Quote:
Originally Posted by huhn View Post
this is not an osd bug.

the desktop still runs at 60 Hz while the GPU runs at 24 hz.

I am having same problem with this composition rate (not sure when it started … definitely on Windows 1709 never noticed it … noticed it only after 1803).

Was running Win10 1803 (build 17134.254) and GF1070 with 399.07 when noticed the problem. Since then tried 391.35 397.93 398.98 (drivers for which I recall it used to work correctly), but all exhibit same problem (trying to download latest 399.24 now)

So here is summary (both HD and SD material):

FSE: display 29.79, composition 60, D3D11 (10bit)
Fullscreen Windowed: display 29.79, composition 29.8, D3D (8bit)

Reason I start investigating it cause could not get Fullscreen Windowed to output 10 bit (actually if OS HDR is turn on … Fullscreen Windowed does output 10bit … but 3D with OS HDR flickers at low rate … unwatchable)

Using LG OLED E6 that does not show refresh rate … but can guess its probably receiving stated display rate (3D stuff in FSE also shows composition rate of 60, but 3D works … this implies GPU sending 23 to TV … otherwise, TV wont switch to 3D mode since there is no standard that defines 3D at 60 rate)

Also rendering times goes up by around 4ms when in FSE with that weird 60 composite rate (for both 2D and 3D … HD and SD)

I don't think OSD report is wrong too … can move mouse and see cursor but MadVR is still in FSE (bringing play control does drop MadVR to Fullscreen Window though)

What worries me is … Windows 1803 somehow hijack MadVR (reimplemented its api?) … so MadVR writes 23.97 to DWM (desktop window manager) instead of directly to screen … DWM process it at 60 and then outputs to screen at 23.97 … certainly would explain seeing cursor on FSE screen, unless I misunderstand FSE definition completely
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