Been busy setting up a standalone MiSTer unit for HDMI and thought I'd share a couple of things I've troubleshooted / discovered during my journey:
1.
CEC Issues: I faced a lot of problems with CEC and the MiSTer plugged in. Devices stopped turning on and off and it was just a mess. The fix was simple, I just removed Pin #13 on one side of the HDMI cable and all is good now. I've attached a diagram below to show which pin to remove. I simply used a solder pick tool and pushed the pin down, cutting through the plastic and then used some tweezers to yank it out. I believe
@misteraddons will be selling CEC-Free HDMI cables in the future.
2.
Alternate .INI files: My TV doesn't play well with every core whilst using the optimal, lower lag "vsync_adjust=2" setting. I'd say about 10% of things don't play nicely (including the CAVE core which only works when I set it to 60Hz in that mode :/ ). Originally I was going through mister.ini setting individual cores to "vsync_adjust=0" when I realised you can set 4 alternate .INI files named (mister_alt_1.ini, mister_alt_2.ini, etc.). You can select the .ini you wish to use in the "MISC OPTIONS" menu and it will reboot and remain current for the session until you power down.
3.
Super "Attract Mode" Script: I highly recommend the "SAM" script. It's very customisable and it's a great little screensaver to have on in the background:
https://github.com/mrchrisster/MiSTer_SAM -- you can SSH into the MiSTer and run "/media/fat/Scripts/MiSTer_SAM_on.sh monitor" to show you what game is coming up next. This will be a great feature for those using it in a cab because when a game appears you want to play, you can just jump on in.
4.
Menu Wallpaper: Changing this is simple, just grab a .jpg or .png and rename it to menu.jpg or menu.png and place it in the root of the SD card. If you wish to have multiple wallpapers, simply delete menu.jpg or png from the root of the SD, create a directory called /wallpapers and put your images in there. Pressing F1 on the keyboard will alternate between the files, but a random one will be called on boot.
5.
Custom Font: Grab the font pack from here:
https://github.com/MiSTer-devel/Fonts_MiSTer, and make a directory in the root of the SD called /font and then add a line to your mister.ini, eg. font=font/Arcade_Outfoxies_(Namco)_alt.pf -- not all the fonts support the all characters, so this can be hit or miss.
Hope these tips helps someone down the line... please add any tips or links to cool MiSTer stuff in this thread.