Freesync LFC not working

[loftie]

Thought I'd pick my fellow forumites brains, I've got a Samsung C24FG73 which has a freesync range of 70 -144Hz. It supports LFC, but I've noticed Freesync doesn't actually work sub 70Hz. In all honesty, I'm not sure it's ever worked as I run vsync on at the same time. I'm connected to my 580 by DP, and Freesync definitely works above 70Hz when I tested on both Overwatch and Dying Light.

I've clean installed Radeon Settings multiple times and it's not had any effect, I've tried googling for monitor drivers but not seen anything. Any other suggestions would be great.
Cheers

 

[loftie]

Yep fellas, should have mentioned that, sorry. The monitor is set to Ultimate Engine and yea it's in the OSD of the monitor. Radeon Settings reports 70-144Hz when hovering over the Freesync toggle button. Does anyone know if Radeon Settings mentions LFC anywhere? Like it shows the Freesync range when you hover over the Freesync button.

Edit: I should also add, I was on 18.12.2 and it wasn't working, I updated to 18.12.3 via a clean install to see if it fixed it and it hasn't.

 

[loftie]

the lfc being enabled/disabled isnt reported in the AMD driver, it should be auto enabled at the driver level.

Yea that's why I was asking, does it show anywhere in the settings to confirm that there is LFC? I thought there was somewhere but in all honesty I can't see it.

Does your monitor display the current refresh rate in its OSD? you could test LFC by watching for sub-minimum FPS and comparing that number to the current refresh rate. 34 FPS with LFC would show as 68Hz, for example.

Nope, the monitor has no way to display it's refresh rate on screen unfortunately. It doesn't even have an option to turn the standby LED off!

 

[loftie]

no unfortunately not.

That's annoying. I've emailed Samsung too, but they're about as useful as a chocolate teapot in all honesty. What a load of faff to get it to work, starting to regret buying this screen. Any other suggestions or thoughts? Cheers

 

[loftie]

AMD link does say though, edit Yeah I mean I know its enabled always in the background but to see the best effect from it Vsync must be enabled is what I saying.

So to get no tearing below the freesync range Vsync must be enabled. otherwise you just get a reduced tearing and lower motion judder.

Interesting chart shankly, I've not seen that one before. Seems odd that in LFC below min refresh rate without vsync there'd be "reduced tearing" as opposed to no tearing, and surprisingly in LFC it must impact mouse latency. I always assumed in LFC the framerate of the screen was just doubled without any input from the game i.e. no vsync required. Hmmmm.