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G-Sync and ULMB at the same time is in fact possible!

Motion blur eliminating strobe backlights found in gaming monitors. This includes NVIDIA LightBoost, Ultra Low Motion Blur (ULMB), EIZO Turbo240, ToastyX Strobelight utility, etc.

Re: G-Sync and ULMB at the same time is in fact possible!

Postby Fluffy » 02 Mar 2017, 23:47

Better than sex...? or Acer XB241H confirmed.

Hello dear Blurbusters! Long time reader, first time poster here. A week ago I have finally swapped my good old 226bw derelict, for a g-sync animal - XB241H - Predator (budget, but a very very decent TN). After a few days of enjoying my new 144 Hz/180 Hz, G-sync and ULMB, I have finally come across this topic.

Long story short. The monitor is very happy to do ULMB + G-sync at the same time, without the need of 3dVison or anything else. Works perfect, and actually resembled me my old 959nf CRT. No lag, crosstalk, tearing, stutters, blur, etc. The only drawback are the 120Hz and sudden changes in/flashes of black frames if the fps is too variable, since the refresh speed of the inserted black frames varies with your fps (mostly noticeable at the loading screens, when fps drops to like 5-10 and almost or completely unnoticeable if you constantly float around 120 fps, doesn't annoy me that much, but could be to some of the people). You can game at 60 fps alright if the frames are stable, it is just the sudden jumps of fps, and if you having a lot of them like in World of Warcraft when the number of players around you constantly changes, e.g. 120-110-100 and then back to 120fps, and in cities you get a lot of them. On the other hand, you barely see it in the Doom games, since you hold stable 120 fps.

So far I have tested it in Nvidia Pendulum Test, Quake 2, Doom 3: BFG, Doom 2016 (Both of the Dooms are pure awesomeness, so fluid, so quick and so clear) and World of Warcraft.

I don't actually know if it will work for other monitors (maybe ASUS equivalent of my Acer). However, if anyone is interested, I can write a step by step of how I did it.

With best regards,
Fluffy
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Re: G-Sync and ULMB at the same time is in fact possible!

Postby Chief Blur Buster » 04 Mar 2017, 18:19

That's fantastic --

What tricks did you need to do to enable GSYNC and ULMB at the same time for this particular display?

Yes, please write a step-by-step on how you did it with the Acer.

Thanks!
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Re: G-Sync and ULMB at the same time is in fact possible!

Postby Trip » 04 Mar 2017, 20:10

Nothing seems to work for the xb270hu with firmware version 1. Think its because it does not support 3d vision and therefore no lightboost. If I use the vertical total +5 trick it actually turns off ulmb while in the correct refresh rate.
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Re: G-Sync and ULMB at the same time is in fact possible!

Postby Fluffy » 04 Mar 2017, 20:27

Hey there! Yeah sure. Not many steps though.

When I went through this topic and tried all the methods (unfortunately none of them worked and I didn't have a 3D Vision set), I understood one thing, you have to trick your monitor into thinking that ULMB is off and then turn the G-sync on. I remember that before ULMB era, people used to use Lightboost tricks. Didn't take me long to try this out.

What you need:

Monitor: Acer XB241H (or equivalent?)
Nvidia drivers: 378.77 (includes 3DVision driver)
Software: ToastyX Strobelight Beta 4
OS: Windows 10 x64

0. Remove any overclock (I've put overclock to off, removing 180 Hz and going back to native 144 Hz, monitor should reboot itself).
1. Put refresh to 120Hz in Nvidia CP (important), ULMB to ON in Manage 3D Settings and Turn OFF G-sync if it was ON.
2. Go to Strobelight setup (btw strobelight.exe wont work) check your monitor and choose 120 Hz (strobed) and 121 Hz (and 144 Hz if you like) for your normal refresh.
3. Install and Reboot (if you had 144 Hz or 180 Hz in the windows prior that, monitor won't respond after reboot).
4. After reboot, in the OSD, you should have 120 Hz and 3D Mode (and instead of Brightness setting it should say Nvidia LightBoost).
5. In Nvidia CP you should have 120 Hz, 121 Hz and 144 Hz if chosen. Keep 120 Hz for Lightboost, choose 121 Hz for Normal/ULMB.
6. Double check that G-sync is still OFF and ULMB is ON in the Nvidia CP.
7. Now there's is funny thing, since in Nvidia CP you have a choice of 120 Hz and at least 121 Hz. Choose 121 Hz and switch ULMB ON in monitor's OSD.
8. Now it's time to create a custom resolution. I used 1920x1079 (just V -1 pixel, you can use whatever you like, I have tested a bunch, works the same, + pixels don't work, monitor goes back to native). Keeping 121 Hz in CP create a custom res, save and choose. You can choose native 1920x1080 later. Although, Nvidia Pendulum hangs if 1920x1080 chosen instead of 1920x1079, the games I have tested worked in native.
9. Now your resolution should be 1920x1079, refresh at 121 Hz and ULMB ON. However, in OSD it should be 1920x1080 120Hz ULMB ON.
10. Go to Nvidia CP and turn G-sync ON and check that G-sync is also in 3D graphic settings, not ULMB (v-sync on or off is up to you, does add little tiny v-sync lag at 120 fps, I use v-sync, but some would prefer to cap fps through Riva Tuner to get rid of that).
11. Start a game and choose 1920x1079 just in case, by now you already should have G-sync and ULMB ON simultaneously.
12. Enjoy your new CRT monitor?

Some things I wanted to mention:

I have repeated the method several times, everything is the same. By the way if you end up without any signal in windows (happened to me when forgot to change from 180 Hz to 120 Hz when used Strobelight) you can go to Windows SafeMode, and uninstall created refresh modes in ToastyX Strobelight.

I don't think it is required, but a few days before finding out the method, I have used 3DTV Play enabler. The 3DTV enabler is just some plugin that removes 14 days trial. But I think it didn't work, since in options it is just your basic stereoscopic 3D (no 3DTV Play) and it's off, or it's because I didn't even install 3DTV Play in the first place, one way or another I don't think you need it. I guess it doesn't really mater as long as you have 3D vision driver installed.

In the options 3D is off, and 3D Vision Discovery is obviously greyed out as the 3D Vision method (I was trying to get 3D ON without the glasses, went through the test with red/blue anaglyph, and since then it is in there, 3D only works in anaglyph).

The Lightboost worked liked ULMB but a lot brighter (I'm using it for everyday use, tested with the blur photo test here, works perfect), both remove the blur, ULMB a bit better, LB has a different pulse width?), unfortunately couldn't force 3D/Lighboost with G-sync, so have to stick to darker ULMB.

If everything works fine you can go back to native 1920x1080 in windows as well as choose native in games, everything should work the same, at least in the games I have tested. However, a no go for the Nvidia Pendulum (choose 1920x1079) and Heavens Benchmark (choose custom res in CP and use display res in bench settings), otherwise everything hangs or monitor looses signal.

You can use Lightboost for a nice bright blur-less windows experience, with native resolution just choose 120 Hz to automatically go to 3D (Lightboost) and 121Hz to go to ULMB. Despite 120 or 121 Hz, games from now on, will switch to ULMB from 3D/Lightboost automatically.

When in Lightboost, videos (be it youtube, flash or mp4) turn ON ULMB when they go full screen (3 second and video goes darker), fixed by turning OFF G-sync, or changing G-sync to fixed refresh rate in Nvidia CP 3D graphic options.

Sorry for the wall of text. Please reply if I have missed anything or you need any clarifications.

Edit: Just retested it from a scratch. Display Driver Uninstaller from Safe Mode and fresh Nvidia drivers. Custom resolution is not needed. Everything works with native resolution straight away. 144 Hz does not work, so no point in choosing it in ToastyX Strobelight. Only 120 Hz provides you with Lightboost, 121 Hz just your normal refresh. G-sync switches Lightboost OFF (forces it to normal 120 Hz). Hence, you can switch ULMB ON in OSD with 121 Hz and with 120 Hz if G-sync is ON. If G-sync and ULMB are ON, both 120 Hz and 121 Hz will provide you with the right results. So, for this particular monitor it's just the ToastyX Strobelight that is needed.

With best regards,
Fluffy
Last edited by Fluffy on 05 Mar 2017, 01:40, edited 1 time in total.
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Re: G-Sync and ULMB at the same time is in fact possible!

Postby Chief Blur Buster » 04 Mar 2017, 22:00

Fascinating, thanks for posting.

I think your exact trick might also work on Dells too (SD2716G users will need to try this).

I will do some experiments on some GSYNC monitors I have sitting here, and see if these tricks work with them too.

Several Acer monitors have pre-unlocked LightBoost, which makes this trick a LOT simpler.
I'm not 100% sure it will work on other brands like BENQ XL2420G which I have here, but I will give it a try.
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Re: G-Sync and ULMB at the same time is in fact possible!

Postby Falkentyne » 04 Mar 2017, 22:26

I'm not entirely sure that you need strobelight. I could be talking out of my butt, but I'm pretty sure all you need to do is create the 121hz resolution in toastyX CRU (1920x1080, 120.5 hz), or 2560x1440, 120.5 hz.

I suggest you try that. Because you cannot activate Lightboost at all on 27" monitors, without a 3d vision 2 kit, so strobelight will not work anyway.
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Re: G-Sync and ULMB at the same time is in fact possible!

Postby Chief Blur Buster » 04 Mar 2017, 23:26

Falkentyne,

LightBoost requires a special exact Vertical Total that unlocks the mode. This is well known for 1920x1080 but what's the special Vertical Total for 2560x1440? I've never succeeded in 'tricking' my ASUS ROG PG278Q into LightBoost mode instead of ULMB mode.

Falkentyne wrote:I suggest you try that. Because you cannot activate Lightboost at all on 27" monitors, without a 3d vision 2 kit, so strobelight will not work anyway.

Strobelight is still VERY useful on these monitors because it automatically creates the special Vertical Total required on all 1080p LightBoost monitors. :D

In fact, StrobeLight will still even turn it on/off for you -- once you've got it tricked into working via another means (e.g. 3D glasses kit). What StrobeLight does not do is do the automatic LightBoost unlock on unsupported monitors.
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Re: G-Sync and ULMB at the same time is in fact possible!

Postby kayaknate » 08 Mar 2017, 12:24

lexlazootin wrote:I've got a feeling this is a way to activate the glitch without glasses, if someone has the Dell please tell me if this works.

1. Disable G-Sync

2. Enable ULMB in monitor

3. Create a custom res and ADD +5 to your Vertical Total

4. Enable G-Sync

And that should work... maybe... When i do this with my XL2420G the lightboost light is on and when i play games my screen goes black.


What do you mean by add +5 to your vertical total? Is this referring to vertical res? So for my dell 1440, I should set it to 1445?
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Re: G-Sync and ULMB at the same time is in fact possible!

Postby lexlazootin » 09 Mar 2017, 10:24

kayaknate wrote:What do you mean by add +5 to your vertical total? Is this referring to vertical res? So for my dell 1440, I should set it to 1445?


No no, just the "Total pixels:" in the Vertical columns. just will skip a few steps and enable lightboost. After you do that, create another resolution with -1 on the active pixel vertical, select it, enable G-Sync and in theory you're good to go.

Idk if it will work tho, please report back if it does.

Edit: actually i change my mind, i don't think this will work. i just don't think it's as complicated as the instructions that were given, i just don't have a monitor that can test it because my G-Sync monitor doesn't work with the glitch :(
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Re: G-Sync and ULMB at the same time is in fact possible!

Postby Chief Blur Buster » 09 Mar 2017, 13:15

kayaknate wrote:What do you mean by add +5 to your vertical total? Is this referring to vertical res? So for my dell 1440, I should set it to 1445?

Blur Busters Custom Resolution Terminology 101
Vertical Total is a CRU (Custom Resolution Utility) terminology.

Both AMD and NVIDIA control panels have custom resolution tweaking utilities built in. Or you can use a third party tweaking utility such as ToastyX CRU. In these utilities, you see terms like "Vertical", "Horizontal", "Vertical Front Porch", "Back Porch", "Sync", etc.

Imagine the screen matrix like a calendar.
  • Horizontal Sync: There are hidden synchronization pixels beyond left-edge of screen (like a Sunday) & right-edge of screen (like a Saturday)
  • Vertical Sync: There are hidden synchronization pixels beyond top edge and after bottom edge (e.g. like 1st week and 5th week).
  • Visible resolution: Metaphorically this is like the weekdays of 2nd through the 4th weeks of a calendar. The "pixels" (days) at the top/bottom/left/right edges of the calendar is invisible (hidden off-screen). Like only being able to view the centre of a calendar through a rectangular stencil. That's the "active resolution"
  • More complexly, within both Horizontal Sync and Vertical Sync there can be multiple hidden dotclock/pixels (Front Porch, Sync, Back Porch). Instead of just 1 hidden pixel at the edges. There can be hundreds of hidden pixels for display synchronization purposes.
  • Vertical Total is the grand total of Vertical Resolution + Vertical Sync + Vertical Back Porch + Vertical Front Porch
  • Horizontal Total is the grand total of Horizontal Resolution + Horizontal Sync + Horizontal Back Porch + Horizontal Front Porch
  • On Blur Busters Forums, "CRU" means Custom Resolution Utility, and "VT" means Vertical Total.

Pixels are transmitted over a cable (VGA, DVI, DP, HDMI) from the computer to the monitor essentially one pixel at a time sequentially (even if packetized on DisplayPort). At dotclock rate (e.g. often 300-350Mhz dotclock for 1920x1080 120-144Hz). Like days on a calendar are transmitted, left to right, top to bottom, scanned-out. The hidden "days" at the edge of this metaphorical calendar are used for synchronization purposes (e.g. telling the monitor it's time to begin displaying the next row of pixels) - porches and sync are hidden off the edges of the screen.

Around these forums, it's often mentioned by BENQ Blur Reduction users. VT1350 is a Vertical Total of 1350 which is sometimes used by BENQ XL2720Z users to improve the quality of BENQ Blur Reduction (larger blanking interval == more time for LCD GtG transitions to finish in darkness before blur reduction strobe backlight flash, ala high speed video of strobe backlight). This means 1080 visible, plus 270 other (total of Vertical Sync + Vertical Back Porch + Vertical Front Porch) = 1080 + 270 = 1350.

However, Vertical Total tweaks are often useful for other tweaks/hacks including unlocking ULMB+GSYNC simultaneously on certain monitors.
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