I got the idea for my changes while testing a combo MythTV FE/BE on EndeavourOS ARM with a KDE/Plasma Desktop Environment. To run Plasma on EOS ARM on a RPI4 you need to use X11 and not Wayland, and you need to turn off Compositor. Also on EOS ARM I could not successfully run from the Console like I could in RPI OS, but it worked fine on top of the Desktop Environment.
So I went back to my RPI OS 64 bit setup as I built using the instructions in my post:
viewtopic.php?f=46&t=4799
Then I used
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sudo raspi-config
1. Booting back to auto-login Desktop
2, In Advanced, disable Compositor
I think the video quality is at least as good running on top of the desktop as it was running from the console.
I am running the following setting to overclock:
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arm_freq=2000
over_voltage=6
gpu_freq=750
I really like what MythTV looks like on EOS ARM particularly with the Plasma Desktop Environment. I'm not a fan of the RPI OS DE and much prefer Plasma.
If anyone wants to experiment with EOS ARM on a RPI 4 they have a new installer that is very simple not unlike Raspberry PI Imager. Go to https://arm.endeavouros.com/ for help.
If anyone needs help putting MythTV on EOS, I have some scripts that help. LMK in comments.