LG 27GK750F-B - 240Hz, 27" 1ms Blur reduction, Freesync

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Romiyo
Posts: 4
Joined: 04 Apr 2019, 02:52

Re: LG 27GK750F-B - 240Hz, 27" 1ms Blur reduction, Freesync

Post by Romiyo » 04 Apr 2019, 11:08

addi wrote:
Romiyo wrote: Thanks for the reply, I am no expert on CRU but I simply went there to edit the extension block of monitor on the 1920:1080 res where i click on the "total" parameters and changed the Vertical lines to 1182, OK, closed and then clicked on the restart 64.exe. I thought this was following the instuctions as given on the front page. Should i do something else?
EDIT: I went back and changed the back porch values instead to like exactly how it was done in the first page example, where it also settled on the 239.760hz number. Still no luck on getting G-sync to work.
Do you own a gtx 10xx Card with more than one displayport output ?

Might aswell try to change the displayport.
Had problems activating G-Sync, just one out of the 3 displayports was actually working.

Never thought even about, that this issue is due to the 1082 VT.
I don't really want to check, if this is actually the case, but you can try :)



Edit: My settings are the same, as yours in CRU.
Just the "MHz" is slightly different, even tho we are using the exact same values.
Shouldnt make a difference anyway.
Follow up: I have managed to get it working by reverting to stock "default" 239.759 settings via CRU restart.exe, then enabling g-sync there, leaving on while working and then going back into CRU to edit to the custom VT. I have not tested it in games but it works using the nvidia pendulum test. Now all i have to do is test g-sync in game, as well as test the custom VT usability to see if the frameskipping issue is solved, but so far so good.

bcle23
Posts: 1
Joined: 06 Apr 2019, 14:56

Re: LG 27GK750F-B - 240Hz, 27" 1ms Blur reduction, Freesync

Post by bcle23 » 06 Apr 2019, 19:19

Is the custom resolution settings you have screenshotted on the first post only supposed to work with Reduced Motion Blur on? Whenever I change to Freesync (G-Sync Compatible,) the screen keeps turning off and on

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k2viper
Posts: 291
Joined: 23 Jan 2018, 06:30

Re: LG 27GK750F-B - 240Hz, 27" 1ms Blur reduction, Freesync

Post by k2viper » 11 Apr 2019, 12:01

bcle23 wrote:Is the custom resolution settings you have screenshotted on the first post only supposed to work with Reduced Motion Blur on? Whenever I change to Freesync (G-Sync Compatible,) the screen keeps turning off and on
No, custom resolution would work and fix stuttering regardless if MBR is on or off.
Describe your problem further.

Romiyo
Posts: 4
Joined: 04 Apr 2019, 02:52

Re: LG 27GK750F-B - 240Hz, 27" 1ms Blur reduction, Freesync

Post by Romiyo » 16 Apr 2019, 06:05

Does anyone know how do you check what firmware your monitor is currently running? Thanks.

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k2viper
Posts: 291
Joined: 23 Jan 2018, 06:30

Re: LG 27GK750F-B - 240Hz, 27" 1ms Blur reduction, Freesync

Post by k2viper » 16 Apr 2019, 09:22

Romiyo wrote:Does anyone know how do you check what firmware your monitor is currently running? Thanks.
Service menu (see first post).

skri170392
Posts: 8
Joined: 30 Mar 2019, 00:33

Re: LG 27GK750F-B - 240Hz, 27" 1ms Blur reduction, Freesync

Post by skri170392 » 20 Apr 2019, 06:38

k2viper wrote:
Hello guys,
Anyone using this new display yet?

http://www.lg.com/us/monitors/lg-27GK75 ... ng-monitor

Just ordered it, hope I'll get my hands on it on weekend or monday.
Picture on LG's off.site displays OSD: blur reduction simultaneously on with freesync. An error, probably?
I dont have an AMD graphics card to test freesync, anyway.
UPDATE Nov 2018: Settings for clearest 240Hz blur reduction mode on LG27GK750F-B monitor

Optimal/stable VT 1304 240hz resolution:

Image

It is an overclocked mode, but it is fully safe to use it. It may result in minor display instability: sometimes, depending on how often you open the OSD, display loses sync and goes blackscreen and back on. It may happen once a 2-3 days, may once a 2 weeks. The more you open OSD, the more often these black screens may occur. Easy fix: power cycle the monitor (via joystick button). After the powercycle, the new 2days-2weeks cycle begun. Only happens with high VT like 1300+.

Workaround for frameskipping bug/buffering out of order/stuttering-juddering:
In CRU under extension blocks find a 240hz resolution. By default its Actual Refresh rate is 239,759hz or 239,764hz or may be other number depending on your system, GPU, driver etc. You need to round it and get Actual refresh rate number exactly 239,760. Note that this refreshrate is also stated in user's manual. VT1304 resolution above is already 239,760.
You also may use lower values like 1182-1184 (only 2-4 above default 1180), the point is to get exact 239,760 if it is not exact at defaults.

Service menu: viewtopic.php?f=2&t=4422 , no useful options found though.

"Optimal" settings: I stick with Gamma mode 4, default contrast and black equalizer, 45 brightness, Fast overdrive, MBR on full-time (yes I love blur reduction and CRT-like look!). Personally I found default colors fine enough, but R-G-B are also tweakable.

ICC profile is installed with display INF: http://gscs-b2c.lge.com/downloadFile?fi ... iLocE7WGOw
How to enable ICC profile: http://www.tftcentral.co.uk/articles/ic ... tm#install

Presets: Gamer 1 and Gamer 2 are the only usable profiles, they are fully adjustable. It's not recommended to use any other presets like FPS/RTS etc.

For minimal input lag make sure you choose "Original" scaling mode under Aspect ratio settings. Default is Full wide, and it is like ~1full frame slower then Original! So if you dont absolutely have to, always choose Original mode!
There is no advertised "Dynamic action sync" option found, but in Original mode this display goes on par with best other 240hz screens with 4,5-5,0ms of total input delay

Freesync and Motion blur reduction dont work together, and I have an Nvidia card, so no Freesync experience to share here.


excuse my ignorance and if this question is stupid, is this overlock safe? Since I notice something strange in the image while playing, is it normal and safe to do this? Excuse my ignorance, I'm new and I do not want to force the monitor ... thanks

mushi
Posts: 26
Joined: 02 Feb 2019, 11:46

Re: LG 27GK750F-B - 240Hz, 27" 1ms Blur reduction, Freesync

Post by mushi » 21 Apr 2019, 06:05

I use the lower values with success (VT 1182-1184)


our beloved monitor is on the nvidia list compatible g-sync now

skri170392
Posts: 8
Joined: 30 Mar 2019, 00:33

Re: LG 27GK750F-B - 240Hz, 27" 1ms Blur reduction, Freesync

Post by skri170392 » 22 Apr 2019, 00:37

mushi wrote:I use the lower values with success (VT 1182-1184)


our beloved monitor is on the nvidia list compatible g-sync now

Thanks ... and that list of nvidia of monitors where I see it?
ya pude copiar el cru de uno de arriba pero no te parece? que se ve borroso cuando juegas?
and then VT 1304 is not safe can damage the monitor and shorten its useful life?
since the vt 1304 for me is more clear and nice but I do not want to shorten the useful life of monitor or damage it .. sorry for my ignorance but I do not want to break it!!

mushi
Posts: 26
Joined: 02 Feb 2019, 11:46

Re: LG 27GK750F-B - 240Hz, 27" 1ms Blur reduction, Freesync

Post by mushi » 23 Apr 2019, 12:21

skri170392 wrote: Thanks ... and that list of nvidia of monitors where I see it?
ya pude copiar el cru de uno de arriba pero no te parece? que se ve borroso cuando juegas?
and then VT 1304 is not safe can damage the monitor and shorten its useful life?
since the vt 1304 for me is more clear and nice but I do not want to shorten the useful life of monitor or damage it .. sorry for my ignorance but I do not want to break it!!
* to test for frameskip: follow the instructions on https://www.testufo.com/frameskipping
* if you have frameskip: use k2viper's overclocked settings, or the alternative settings (for me, alternative worked better: https://www.testufo.com/frameskipping])
* if using the alternative settings you have frameskip, and you don't want to use the overclocked settings: try other VT's, always respecting the exact value of 239.760hz . Apply the settings on CRU, run restart64.exe and repeat the frameskipping test. Repeat until there's no frameskipping

There are many persons using the overclocked value. I believe its fine - but if you don't feel confortable, you need to find other values for your monitor. Test, test, test.


Regarding the g-sync compatibility with our monitor, the next nvidia drivers will support it.

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k2viper
Posts: 291
Joined: 23 Jan 2018, 06:30

Re: LG 27GK750F-B - 240Hz, 27" 1ms Blur reduction, Freesync

Post by k2viper » 24 Apr 2019, 02:29

I'm using VT 1304 with MBR constantly on for more then a year (since feb 2018), and I see no problems. I beleive this overclock is totally safe. The only downside is described in 1st TLDR post and has a workaround:
k2viper wrote:It may result in minor display instability: sometimes, depending on how often you open the OSD, display loses sync and goes blackscreen and back on. It may happen once a 2-3 days, may once a 2 weeks. The more you open OSD, the more often these black screens may occur. Easy fix: power cycle the monitor (via joystick button). After the powercycle, the new 2days-2weeks cycle begun. Only happens with high VT like 1300+.

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