Milincho wrote: ↑17 Nov 2022, 21:50
Seems like overclocking DLP projectors is much more succesful. Don't know why the Epson 3-LCD tech is so tight with refresh rates and does frameskipping at *anything* over 60Hz. It does 120Hz in the 3D mode, even if it displays only 60Hz in info page, we know it's 60Hz per eye, so the capability is really there...
Anyway, thanks for the help. Really appreciated.
Best to abuse the 3D mode, force 3D mode even if you only use 2D, and you'll get 120Hz for 2D. Aren't you able to do that? Make sure you stick to the only resolution that 3D mode supports -- sometimes 640x480 is not an option and you must use 1080p or 720p or 800x600 or 1280x800 whatever 3D Mode specifies.
Does any 120Hz mode show up in the EDIDs? Check all resolutions and find which one has a 120Hz mode (it might only be the 800x600 one, it might only be the 1280x800 one). Alternatively try forcing common 3D Mode resolutions (with 3D Mode enabled in the projector) and see what happens. 3D mode works fine in 2D, if it's a frame sequential mode, and it becomes a normal 120Hz 2D mode.
Once you find the
working 120Hz mode, create the QFT 60Hz mode
only from the EDID timing numbers of that working 120Hz mode, via the Vertical Total Calculator.
Now, if 120Hz does not show up in the EDIDs, when 3D Mode is enabled, then you've got to reverse-engineer it by testing common standard 3D Mode resolutions (definitely not 640x480). Once 120Hz works, then use ONLY that to create QFT 60Hz. (This use case is useful if you've got 60fps 60Hz content that you want the lowest-lag from without stutters). Now, in theory you could try to QFT the 120Hz (some LCDs can QFT refresh cycles faster than max Hz, but it's only for full-pre-framebuffering panels)
Remember some 3D modes require low resolutions (1280x720) on 1080p projectors, see the very old
120Hz from PC to TV HOWTO, which is almost ten years old.