External monitor has intermittent signal and flashes black unless I disable it in device manager

I bought a new external monitor recently and have had the issue of an intermittent display signal

Disabling the monitor in device manager fixes the issue and the monitor works fine when disabled so it’s highly likely its some weird software issue but I’d like to find a proper fix for it

I am able to get it to have constant display signal by chance sometimes without disabling the display in device manager but turning off the external display brings back the issue when I turn it back on and it reconnects

OS: Windows 11

Display: Lenovo G27QC-30 with Lenovo’s drivers installed *have tried with Microsoft drivers and run into the same issue

Have already tried uninstalling and reinstalling monitor on device manager and reinstalling drivers and that hasn’t fixed the issue

Also have already tried using display driver uninstaller to clean install graphics drivers

Edit:

the events tab in windows device manager for the monitor properties does show this error sometimes:

Device not started (monitor)

Device DISPLAY\LEN66F4\5&3287afbc&1&UID4352 had a problem starting.

Driver Name: oem64.inf Class Guid: {4d36e96e-e325-11ce-bfc1-08002be10318} Service: monitor Lower Filters: Upper Filters: Problem: 0x0 Problem Status: 0xC00000E5

https://lemmy.world/pictrs/image/e1a7f9ef-cb42-4fbe-88d0-f9c35487f657.png

Edit 2:

The monitor will work fine once if i restart my laptop but disabling and re=enabling in device manager causes the problem

TrickDacy,

Disabling the monitor in device manager fixes the issue and the monitor works fine when disabled

I don’t understand this phrase and I’m not sure why no one else has asked about it. What does this mean?

x4740N,

When you open the device manger it gives you an option to disable devices

I do this with the display to get it in a working state that stops the issue but its not a proper fix

TrickDacy,

Yes, what doesn’t make sense to me is what does “working” mean? Does disabling it not disable it, but instead fixes the issue?

x4740N,

Yes

i didn’t know any way to better clarify it

but i want to find a proper fix instead of disabling it in device manager

altima_neo,
@altima_neo@lemmy.zip avatar

You try a different cable? What interface are you using?

Also have you tried a different computer on it to make sure it’s not the monitor at fault?

x4740N,

Also did try another cable already

x4740N,

deleted_by_author

    •
    Tylerdurdon,

    The guy is following basic troubleshooting practices and you didn’t answer a single question. If you really want to narrow down where the issue is, try those things first before deciding you know where the issue is.

    towerful,

    You haven’t mentioned any cables, resolutions or GPU. The monitor is 2560x1440 at 165Hz. Are you running it at that? Is it straight from the GPU, or does it go through a dock? Are you on a desktop, tablet, laptop?

    Does it work at 1080p60? 720p60?

    Might be a crappy DP cable, and disabling the device in device manager is actually disabling extra features or AMD FreeSync or whatever, so its going back to being a dumb display

    x4740N,

    I’m using hdmi because my laptop only has a hdmi port

    Not using a dock

    x4740N,

    Activating amd freesync on the moniter does cause the issue but it isn’t the only cause and the issue doesn’t go away after turning off freesync

    x4740N, (edited )

    The issue seems to have gone away for now after checking resolutions right up to the native 2560 x 1440 resolution

    Not sure if it’s just temporarily fixed or not

    Edit: nevermind it’s back

    towerful,

    Ok, HDMI from laptop to monitor, running 2560x1440.
    Rulled out freesync.
    What refresh rate? Is it stable at 60hz?

    x4740N,

    No it is not stable at 60hz

    x4740N,

    Not stable at 60hz

    towerful,

    Have you had other monitors working from the laptop? From that port?

    You might need to RMA the monitor.
    You’ve tried other cables, and if it’s all fine with other monitors then it points at bandwidth over the HDMI connection (ruled out by using a lower resolution/refresh rate) or it points at the monitor itself.

    Disabling it in device manager is such an odd fix, it is nothing I’ve even remotely heard of, seen or come across. Googling around it is turning up nothing.
    It hints at a software issue, but that might be a red herring. Disabling the device might make windows send “safe” resolution, refresh rate, bit depth, HDR etc. so if a dodgy port/cable/monitor can’t handle the higher bandwidth, the safe signal is lower bandwidth and hides the underlying issue.
    But it feels like that has been ruled out.

    Maybe contact the manufacturer, see if they can help? Make a list of everything you have tried, and what happened. That way, you can hopefully break through T1 support or get a fast RMA approval

    x4740N,

    Disabling the device might make windows send “safe” resolution, refresh rate, bit depth, HDR etc

    Its definitely not windows sending a safe resolution and / or refresh rate, i checked the monitor OSD to confirm this

    HDR works fine

    I discovered that the monitor is working fine without disabling it in device manager if i select a limited range under “Output dynamic range” in the NVIDIA control panel, i have tested this in 8, 10 & 12bpc and at 60, 120 & 144hz, i am running at the native resolution for the monitor which is 2560 x 1440 so something doesn’t like the full range

    im going to check again at lower resolutions and full range to see if i can rule out a HDMI bandwidth issue

    and if this helps

    the hdmi cables im using used to be used for a TV

    x4740N,

    Ok so setting it to limited range appears to have been a fluke because my log of further troubleshooting makes it evident.

    Below i am pasting a text log of further troubleshooting tests i did, it does seem to suggest a faulty HDMI cable, Maybe the second HDMI cable i used to test twice also was faulty

    i’m going to try and see if i can find another HDMI cable to test to see if that gives me any more information

    but I’m wondering why disabling the monitor in device manager stops the issue if it is a faulty HDMI cable

    
<span style="color:#323232;">Monitor resolution test:
</span><span style="color:#323232;">
</span><span style="color:#323232;">PC Resolutions:
</span><span style="color:#323232;">
</span><span style="color:#323232;">800x600:
</span><span style="color:#323232;">
</span><span style="color:#323232;">144hz, 8bpc, Full Dynamic Range: Working at current time
</span><span style="color:#323232;">*does not scale to full screen size and has black borders
</span><span style="color:#323232;">60HZ,  8bpc, Full Dynamic Range: Working at current time
</span><span style="color:#323232;">*With this one monitor or windows or gpu scales to the full screen size
</span><span style="color:#323232;">60HZ,  10bpc, Full Dynamic Range: Working at current time
</span><span style="color:#323232;">*monitor or windows or gpu scales to the full screen size
</span><span style="color:#323232;">60HZ,  12bpc, Full Dynamic Range: Working at current timr
</span><span style="color:#323232;">*monitor or windows scales to the full screen size
</span><span style="color:#323232;">
</span><span style="color:#323232;">1024x768:
</span><span style="color:#323232;">
</span><span style="color:#323232;">144hz, 8bpc, Full Dynamic Range: Working at current time
</span><span style="color:#323232;">*Does not scale to full screen size
</span><span style="color:#323232;">
</span><span style="color:#323232;">60Hz, 12bpc, Full Dynamic Range: Working at current time
</span><span style="color:#323232;">* Scales to full screen size
</span><span style="color:#323232;">
</span><span style="color:#323232;">1152x864:
</span><span style="color:#323232;">
</span><span style="color:#323232;">144hz, 8bpc, Full Dyanimc Range: Working at current time
</span><span style="color:#323232;">*Does not scale to full screen size
</span><span style="color:#323232;">
</span><span style="color:#323232;">========
</span><span style="color:#323232;">
</span><span style="color:#323232;">Later Steps:
</span><span style="color:#323232;">
</span><span style="color:#323232;">2560x1440 at 12bpc 60hz full dynamic range works, so does 144hz 8bpc but this is after going through various resolutions in increasing length as documented in this text document
</span><span style="color:#323232;">
</span><span style="color:#323232;">turning monitor off and on at this point in time does not reintroduce issue
</span><span style="color:#323232;">
</span><span style="color:#323232;">next step is unplugging and re-plugging hdmi cable
</span><span style="color:#323232;">
</span><span style="color:#323232;">re-plugging hdmi cable after approximatly 30 seconds, this reintroduces issue, changing to limited in nvidia control panel does not fix this
</span><span style="color:#323232;">
</span><span style="color:#323232;">changing to 800x600 pc resolution after unplugging and replugging hdmi cable with nvidia control panel set at 144hz, 8bpc and limited dynamic range does not fix issue
</span><span style="color:#323232;">
</span><span style="color:#323232;">then changing refresh rate to 60hz does not fix issue
</span><span style="color:#323232;">
</span><span style="color:#323232;">setting to 1440x2560 before rebooting to see if rebooting does something
</span><span style="color:#323232;">
</span><span style="color:#323232;">after laptop the nvidia control panel resolution was at 800x600 and the issue wasnt there but changed to 1440x2560 at 144hz 8bpc and issue started
</span><span style="color:#323232;">
</span><span style="color:#323232;">disabling the monitor at this point in time in the device manager still fixes the problem (but breaks windows nightlight from working on external monitor as i have personally noticed when first trying to use windows nightlight after disabling the monitor in the device manager)
</span><span style="color:#323232;">
</span><span style="color:#323232;">setting to 60hz, 8bpc 800x600 resolution
</span><span style="color:#323232;">
</span><span style="color:#323232;">enabled in device manager, monitor blanks once but issue goes away
</span><span style="color:#323232;">
</span><span style="color:#323232;">going to unplug and re-plug cable
</span><span style="color:#323232;">
</span><span style="color:#323232;">re-plugged hdmi cable after 30 seconds, monitor blanks once but is stable and issue is gone
</span><span style="color:#323232;">
</span><span style="color:#323232;">noted that output dynamic range in nvidia control panel is still set to limited
</span><span style="color:#323232;">
</span><span style="color:#323232;">going to set to full dynamic range
</span><span style="color:#323232;">
</span><span style="color:#323232;">at 8bpc, 60hz 800x600 at full dynamic resolution issue does not present itself
</span><span style="color:#323232;">
</span><span style="color:#323232;">going to unplug and re-plug cable while the display resolution settings remain the same in nvidia control panel
</span><span style="color:#323232;">
</span><span style="color:#323232;">plugging in cable after aproximatly 30 seconds, monitor blanks once but issue does not present itself
</span>
    towerful,

    Only reason I can think that disabling the monitor in the Device Manager is that it disabled freesync or HDR or stops windows trying to send CEC power saving commands or whatever.
    I have no idea why it’s a fix, but it clearly stopping windows from trying to do something which causes the screen to flash.

    I would be surprised if changing between limited and full-range fixed it. That’s a hangover from old broadcast standards. It doesn’t change the data rates.

    It seems like it’s working at lower data rates?
    So 1440p60 is working but 1440p144 isn’t?
    Which points to an HDMI cable issue, a GPU issue or a GPU driver issue (and I mention GPU/Driver because of freesync)

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