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
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
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)