On my RG40XXV running muOS Pixie, the HDMI output flickers constantly when connected to an LG TV. I’ve tested all possible resolutions that Pixie offers (480p, 576p, 720p,), but the issue persists across all of them.
The display randomly goes black and comes back — especially while navigating the menu, though it also happens in games.
Worth noting: this issue does not occur on Stock OS using the same HDMI cable and same TV, so it seems to be specific to muOS or the Pixie build.
out of interest do you run Pi-Hole? You should see how much shit WebOS from LG does on your network. HDMI Will be the last of your concerns.
You’re shutting down between config changes? The OS runs checks on boot for HDMI to reduce instability
Hi! Thanks for the suggestion — yes, I did perform a full shutdown between HDMI config changes, exactly as recommended. Unfortunately, the issue still persists.
I tested on two different LG TVs, and in both cases the HDMI output still flickers randomly — especially in the menu or during resolution changes. I’ve tried all available resolutions (480p, 576p, 720p) , but the problem remains consistent across both displays.
If there’s any debug mode I can enable to help pinpoint the issue, let me know — happy to provide more details.
For reference, the HDMI output works perfectly on the same LG TV when using the stock OS — no flickering or blackouts at all.
This is unofficial, but can you try this script?
I want to see if 1080p has the same issues.
What’s funny is if you google the problem, which I’m sure OP hasn’t done - the vast majority of similar issues are the reverse of the issue - that they cannot get out of 720p mode for higher resolution content.
It loops back to my other comment, WebOS sucks, LG TVs aren’t good.
It turned out the issue was the cable (cheap HDMI 1.3).
I replaced it with a Vention 1m HDMI 2.0 Mini HDMI cable, and the HDMI flickering problem is completely gone in muOS!
I still don’t quite understand how the Stock OS worked fine with the old cable, but I’m just glad the issue is finally solved. 
muOS is way better than the Stock OS!
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