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Problems with FreeSync via HDMI (LG 24MP68VQ)

10K views 10 replies 5 participants last post by  deNordic 
#1 ·
I have got two severe problems with this otherwise fine LG monitor.
To be able to use the 75 Hz of this monitor, FreeSync has to be activated in the monitor's menu .

1) There is no signal when I start my pc (no BIOS/POST/Boot Manager). No signal up until it has booted into an OS.
2) When using Win 7 (this does not happen in Win 8/10 or Archlinux/Debian) and I disconnect my second monitor, the LG loses either immediately the signal or loses it after starting a movie or a .gif. I can't do anything (not even activate the other monitor) and I have to reboot.

First off all the second problem should not be important , because I'm planning to abandon Win 7 for good rather soon, but I need to make sure, that it doesn't appear on Windows 8/10.
Regarding the first problem the only fix I have found is to deactivate the FreeSync setting and I will get a signal right from the start.
However the problem is, that I have to manually change this setting for every restart in order to be able to set it to 75 Hz.

I'm using a R390 with the latest driver and a HDMI-HDMI connection and I tried already different cables.

Has anyone experienced similar issues and knows how to fix them?
Is it worth to try a DP-HDMI cable or an adapter?

Thank you!

btw.:
You can change the FreeSync range (CRU 1.3) from 40-75 Hz to 37-75 Hz and LFC will work.
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#2 ·
Quote:
Originally Posted by HalongPort View Post

...:
Hi , I am having the same issue like you , I am talking about the first one when there is no signal during the first few 4-5 seconds after you boot the PC and it either sometimes gets signal on welcome message or most of the time just straight on desktop.Like you said this happens only if you have freesync activated.I am using RX 480 and a HDMI cable.I have tried only 2 HDMI cables , the first one was not giving any signal so I checked with the VGA cable which comes with the monitor to see if the monitor even works and it started , so I went to the local shop and bough a new cable and this time it worked.Also there was nothing wrong with the first HDMI cable I used , I have tried it on my old monitor and it worked just fine.
Have you been able to find how to fix this issue or any other way around it than deactivating freesync?

Also another issue I am getting with the monitor is sometimes getting a grey screen with sparkly dots for 2-3 seconds followed by a green screen for about 1-2 seconds.I am not sure what is causing that , but I think is related to a software I use , not sure though.

Btw. I am on Win 10 if this matters.
Hope someone can help us with this issue.
 
#3 ·
Quote:
Originally Posted by HalongPort View Post

I have got two severe problems with this otherwise fine LG monitor.
To be able to use the 75 Hz of this monitor, FreeSync has to be activated in the monitor's menu .

1) There is no signal when I start my pc (no BIOS/POST/Boot Manager). No signal up until it has booted into an OS.
2) When using Win 7 (this does not happen in Win 8/10 or Archlinux/Debian) and I disconnect my second monitor, the LG loses either immediately the signal or loses it after starting a movie or a .gif. I can't do anything (not even activate the other monitor) and I have to reboot.

First off all the second problem should not be important , because I'm planning to abandon Win 7 for good rather soon, but I need to make sure, that it doesn't appear on Windows 8/10.
Regarding the first problem the only fix I have found is to deactivate the FreeSync setting and I will get a signal right from the start.
However the problem is, that I have to manually change this setting for every restart in order to be able to set it to 75 Hz.

I'm using a R390 with the latest driver and a HDMI-HDMI connection and I tried already different cables.

Has anyone experienced similar issues and knows how to fix them?
Is it worth to try a DP-HDMI cable or an adapter?

Thank you!

btw.:
You can change the FreeSync range (CRU 1.3) from 40-75 Hz to 37-75 Hz and LFC will work.
thumb.gif
Quote:
Originally Posted by 24mp68vqSUXS View Post

Btw. I am on Win 10 if this matters.
Hope someone can help us with this issue.
I know the solution for this issue. When I first got this monitor, I was kinda annoyed with this issue and did a lot of tinkering with the monitor & Windows. Turn out it's simple to fix this:

1. First you have to switch your BIOS to UEFI. Read your mobo manual to know how to switch. If you have an Asus mobo like me, go to "Boot" tab in your BIOS and disable CSM. Please note that if your Windows is using legacy BIOS, switching to UEFI may requires reinstalling Windows.
2. After switching to UEFI. Disable Freesync on your monitor and go to UEFI/BIOS, then enable Freesync again. Now you can enjoy the monitor without that annoying black screen issue
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BTW, I also change my freesync range to 37-75 but unsure if LFC is working. Testing The Witcher 3 with 30 fps limiter still cause some stutters. How do you test it?
 
#4 ·
Quote:
Originally Posted by killerhuy View Post

I know the solution for this issue. When I first got this monitor, I was kinda annoyed with this issue and did a lot of tinkering with the monitor & Windows. Turn out it's simple to fix this:

1. First you have to switch your BIOS to UEFI. Read your mobo manual to know how to switch. If you have an Asus mobo like me, go to "Boot" tab in your BIOS and disable CSM. Please note that if your Windows is using legacy BIOS, switching to UEFI may requires reinstalling Windows.
2. After switching to UEFI. Disable Freesync on your monitor and go to UEFI/BIOS, then enable Freesync again. Now you can enjoy the monitor without that annoying black screen issue
thumb.gif


BTW, I also change my freesync range to 37-75 but unsure if LFC is working. Testing The Witcher 3 with 30 fps limiter still cause some stutters. How do you test it?
Thank you for the answer , will try it tomorrow and see if it works for me.
Also about reading my mobos manual..... you can see how useful it is...
biggrin.gif
(gj asus,2 sentences on explaining how the boot menu works
biggrin.gif
,just joking they are still the best choice for a mobo
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and I am sure it is not that hard to figure out
rolleyes.gif
)


Also I don't know about the LFC because I am using default range , but don't you have to be in the freesync range for it to work?So you should test it with fps limit 37 or 38?
Might play around with it when I have time and if I manage to make it work for me will share how I did it.
 
#5 ·
Quote:
Originally Posted by 24mp68vqSUXS View Post

Thank you for the answer , will try it tomorrow and see if it works for me.
Also about reading my mobos manual..... you can see how useful it is...
biggrin.gif
(gj asus,2 sentences on explaining how the boot menu works
biggrin.gif
,just joking they are still the best choice for a mobo
thumb.gif
and I am sure it is not that hard to figure out
rolleyes.gif
)

Also I don't know about the LFC because I am using default range , but don't you have to be in the freesync range for it to work?So you should test it with fps limit 37 or 38?
Might play around with it when I have time and if I manage to make it work for me will share how I did it.
Well your mobo layout is the same as mine so that's easy. Just go to CSM (Compatibility Support Module) and disable it to get into UEFI.

The purpose of LFC is to smoothen & remove tearing on screen when your fps goes below the Freesync range. I haven't experienced the official monitor with LFC so still not sure when the LFC is activated.
 
#6 ·
Quote:
Originally Posted by killerhuy View Post

Well your mobo layout is the same as mine so that's easy. Just go to CSM (Compatibility Support Module) and disable it to get into UEFI.

The purpose of LFC is to smoothen & remove tearing on screen when your fps goes below the Freesync range. I haven't experienced the official monitor with LFC so still not sure when the LFC is activated.
Actually, disabling CSM doesn't fix the issue for me.But playing around with the settings in the BIOS, I found a solution to the problem.
There is an option called "Fast Boot" , when enabled it powers up only the necessary parts to start-up the system and later on powers up the rest to speed up boot time.
When I disabled it , everything worked fine.Seems like this function do not thing the monitor is important , lol.Sometimes it does not power up my keyboard in time so I cannot even enter in the BIOS.
rolleyes.gif



I am not sure if I will keep it Enabled or Disabled , it saves me only 4 seconds in boot time so I am not sure if it is worth the hassle.But also I am not going to enter the BIOS everyday or something like that.

Also I am not sure if I want to keep the CSM on or off.I got a warning while disabling it but it seems everything works fine and I didn't need to reinstall Windows.
Also I am not seeing any advantages of using UEFI over BIOS?Any suggestions on what to do?
 
#7 ·
Quote:
Originally Posted by 24mp68vqSUXS View Post

Actually, disabling CSM doesn't fix the issue for me.But playing around with the settings in the BIOS, I found a solution to the problem.
There is an option called "Fast Boot" , when enabled it powers up only the necessary parts to start-up the system and later on powers up the rest to speed up boot time.
When I disabled it , everything worked fine.Seems like this function do not thing the monitor is important , lol.Sometimes it does not power up my keyboard in time so I cannot even enter in the BIOS.
rolleyes.gif


I am not sure if I will keep it Enabled or Disabled , it saves me only 4 seconds in boot time so I am not sure if it is worth the hassle.But also I am not going to enter the BIOS everyday or something like that.

Also I am not sure if I want to keep the CSM on or off.I got a warning while disabling it but it seems everything works fine and I didn't need to reinstall Windows.
Also I am not seeing any advantages of using UEFI over BIOS?Any suggestions on what to do?
That's strange for your case. I show my walkthrough to other user and they are success at fixing the issue. About Fast Boot, I actually like this feature. I also reduce the boot info to 1 second so that I can cold boot into desktop in just 4 second
tongue.gif
. My keyboard & mouse are always the peripherals to be booted first so I have no problem with accessing UEFI in just 1 second boot info.

About UEFI, it's a successor to a very old & outdated boot system called BIOS. You could see that BIOS is "IDE" & UEFI is "SATA". The boot menu you are using right now (like in your pictures) is actually UEFI because you can see it has a flashy background, animation, and a mouse support for navigation. However, to ensure that your mainboard is compatible with the old system, it uses CSM to dual boot BIOS & UEFI at the same time, which causes an issue with our Freesync monitor. Disabling CSM should get rid of that issue, I can see in your last photo that you've already disabled it (hence the boot options as "Windows Boot Manager" & "UEFI..."). You can try to turn Fast Boot on again, it should be no problem.
 
#8 ·
I was eyeing this monitor because it has both Freesync and it's an IPS panel, but after reading this post, I'm rather angry and dissapointed.
thumbsdownsmileyanim.gif

I own a similar IPS panel from LG, without Freesync (older generation) and I'm very satisfied with it.
How could it be that you specifically need to be in UEFI mode or otherwise disable Fast Boot in order to properly use this monitor? This sounds outrageous!
mad.gif

Do you have any idea if this is an isolated issue or a general one?

This is blocking me from buying this monitor - if indeed it exhibits the problems described here. I can't imagine how a monitor can require such specific features to be enabled in order to properly work in Freesync mode. By the way, do any of you have any sources to back up - any manual or support post on this - or is it just your own experimentation which led to these conclusions?

Have you also tried changing drivers, running DDU, clean-up, etc? To determine whether it might be a driver issue or not?
 
#9 ·
I have the same problem with my Asus RX480 OC and this monitor. My motherboard is Gigabyte Z77X-UD5H.
I'm kinda annoyed and don't know how to solve it. All of a sudden it sends no signal when GPU is installed on the main PCI-E x16 slot.
Currently using it with HDMI-DVI-D cable and the graphics card is installed in the PCI-E x8 slot.

Seems pretty weird to me. Any ideas please?
 
#10 ·
Quote:
Originally Posted by deNordic View Post

I have the same problem with my Asus RX480 OC and this monitor. My motherboard is Gigabyte Z77X-UD5H.
I'm kinda annoyed and don't know how to solve it. All of a sudden it sends no signal when GPU is installed on the main PCI-E x16 slot.
Currently using it with HDMI-DVI-D cable and the graphics card is installed in the PCI-E x8 slot.

Seems pretty weird to me. Any ideas please?
There maybe an issue with your PCI-E x16 slot. Have you tried with the other monitor while your GPU is installed on the x16 slot?
 
#11 ·
Quote:
Originally Posted by killerhuy View Post

There maybe an issue with your PCI-E x16 slot. Have you tried with the other monitor while your GPU is installed on the x16 slot?
Yes. Currently i have it installed on the PCI-E x8 slot and it works fine. Maybe my x16 slot is defective or i don't know what's happening. It's getting complicated when i remember that i tried my old HD7970 on the x16 slot and it was working. Anyway i won't bother anymore.
 
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