Windows 10 1903 forcing 120hz on resolutions below 1920x1080

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Shrib
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Windows 10 1903 forcing 120hz on resolutions below 1920x1080

Post by Shrib » 21 Jul 2019, 10:33

I'm not sure why but with my AMD Vega any resolution below 1080p is showing 120hz in the TestUFO refresh rate checker despite the 240hz mode being correctly selected, 1080p is correctly showing 240hz. This doesn't occur with my windows 8.1 install. I don't want to add the resolution manually using CRU as that appears to me to introduce latency (presumably due to the way 240hz monitors are setup). Alienware AW2518HF monitor. The monitor itself reports the correct 240hz 1920x1080 (black bars) resolution but it's clearly 120hz.

Pls halp!

It occurs even if I remove the 120hz 1080p resolution using CRU.

https://i.imgur.com/q8QsA29.png

Furthermore, if I select the 144hz mode, it will show 72hz in TestUFO refresh rate!
https://i.imgur.com/AsTy1qZ.png

Stock CRU/timings/config, have DDUed and clean installed GPU driver.

Switching to full panel and then back to Center appears to fix the issue until a resolution change.
Last edited by Shrib on 24 Jul 2019, 13:51, edited 1 time in total.

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RealNC
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Re: Windows 10 1903 forcing 120hz on resolutions below 1920x

Post by RealNC » 23 Jul 2019, 11:37

Looks like a browser issue. Close all programs, all tabs, and only have that one testufo tab open in the browser.
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Shrib
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Re: Windows 10 1903 forcing 120hz on resolutions below 1920x

Post by Shrib » 24 Jul 2019, 10:37

RealNC wrote:Looks like a browser issue. Close all programs, all tabs, and only have that one testufo tab open in the browser.
It occurs in both chrome and firefox and it's applicable to the desktop too

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Re: Windows 10 1903 forcing 120hz on resolutions below 1920x

Post by RealNC » 24 Jul 2019, 10:44

If you disable all FPS caps, force vsync ON and run a game that can easily reach FPS = Hz, you should see 240FPS (due to vsync.) If that's the case, then this does look like the testufo test fails for whatever reason.
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Shrib
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Re: Windows 10 1903 forcing 120hz on resolutions below 1920x

Post by Shrib » 24 Jul 2019, 13:42

RealNC wrote:If you disable all FPS caps, force vsync ON and run a game that can easily reach FPS = Hz, you should see 240FPS (due to vsync.) If that's the case, then this does look like the testufo test fails for whatever reason.
Enabling v-sync no fps cap shows 120 fps, rather than 240. This is with scaling as 'Center' in AMD control settings.

https://i.imgur.com/3DN2gdP.png (monitor OSD is showing 240hz)

If I switch from 'Center' to 'Full panel' and then enable V-sync it shows the correct 240hz.
https://i.imgur.com/HQNN0Kc.png

If I tick the 'GPU scaling' box and retain 'Center' it's also capped at 120 fps. 'GPU scaling' 'full panel' is 240 fps.

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Re: Windows 10 1903 forcing 120hz on resolutions below 1920x

Post by RealNC » 25 Jul 2019, 08:01

Well, AMD driver bug then. I don't know if there's anything you can do. It seems GPU scaling applies a 1/2 vsync.
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Shrib
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Re: Windows 10 1903 forcing 120hz on resolutions below 1920x

Post by Shrib » 03 Aug 2019, 10:38

RealNC wrote:Well, AMD driver bug then. I don't know if there's anything you can do. It seems GPU scaling applies a 1/2 vsync.
Does this mean everything is being rendered in 120 fps if v-sync is turned off?

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