I have an AMD Radeon RX Vega 64 Liquid. The original ones from AMD when they came out.
Desktop PC, one PC monitor on DisplayPort, and one TV nearby connected via HDMI cable, on which I occasionally play movies from my PC.
I have experienced this issue from Day 1, but never bothered posting before just now, as the workaround is fairly easy. But now it gets annoying, and I'd like people's input in case someone knows a solution or has more clues I could follow.
So, basically the problem is that I see signal corruption over HDMI on the TV when turning the TV back on after it was turned off., and corruption only goes away if I unplug then re-plug the HDMI cable (either the TV end or the PC end, it doesn't matter, as long as I unplug then re-plug).
It doesn't always happen, but almost always (I'd say at least 90-95% of the time). Even happens if the TV was turned off for only a few seconds, then when turning back on the signal isn't stable, despite the fact that before turning off I could have watched movies for hours with no issue whatsoever. It doesn't need the TV to be off for a long time for the problem to issue, and obviously, the HDMI connection is secure and I'm not touching it at all before the issue occurs.
Not sure the signal "corruption" is the right word,l but don't know how else to call this. Here's a video of the issue if it can help: https://youtu.be/Juyx5qR2jn8
Motherboard = ASUS Zenith Extreme
Chipset = X399
BIOS = version 2001
CPU = AMD Ryzen Threadripper 1950X
GPU = AMD RX Vega 64 liquid cooling edition
RAM = TeamGroup 32 GB (4 x 8 GB)
PSU = Corsair HX 1000
Monitor = Acer XR341CK, connected via DisplayPort
TV = LG OLED55C7P, connected via HDMI
OS = Windows 10 Pro x64 build 1903
AMD Chipset driver version installed = 1.8.19.0915
AMD GPU driver version installed = 19.8.2
P.S. some of tghe things I've tried:
1) Reverting to stock clock and voltage (I usually run undervolt/underclock). But stock voltage/clock didn't change anything and I'm still seeing the problem.
2) Setting a lower resolution on the TV: 1920x1080 instead of 4K. No change.
3) Setting refresh rate to 30 Hz instead of 60 Hz on to TV. No change.
4) Trying an HDMI signal extender. Didn't help.
5) Trying different HDMI cables (tried 4 of them, of different lengths between 4' and 15')