

Several of the prerendered animated cutscenes in X4 were not loading properly. This seems hit or miss, and might just be a bug with the game itself.

no audio issues with x4 as reported by others. not running proton tricks or any scripts
Some videos in the extras don't play.

GST_PLUGIN_FEATURE_RANK=protonaudioconverterbin:NONE %command%
Credit to Swish's report for discovering this launch option. By using this launch option and Proton GE (I use 8-8), the audio in cutscenes for X4 will play without the need of using protontricks to install wmp11.
wmp11
Protontricks with wmp11 fixes the problem when opening movies, including x4.
Remeber to install VLC from discovery too, otherwise it wouldn't work.
With GE 7-55 and using protontricks to install wmp11, games play great and fmvs play with audio, Day of Sigma included!
Install wmp11 via protontricks
FMV audio missing without protontricks wmp11
without tweaks, games will play, but will have issues with fmvs
I've only played a few hours, but i havent run into any issues yet! Each game launches and runs well.
occasionally froze for a few frames (usually at crucial moments, haha), idk if this is because the port is bad or because of proton.
i havent tried x4 yet, am just now starting x3. only reporting what ive seen so far. game is a horrible port of snes and a ps1 game, it uses 2x more energy than it needs to. but its still fully playable
Games work as expected on Experimental, Story can be enjoyed too with crucial FMVs as far as i can tell
Set TDP to 5 instead of 15. Works fine without any notable drawbacks.
FMVs outside of X4 (Day of Sigma and Trailers) do not work at all.
Collection doesn't inherently support the 16:10 ratio of the Deck, can be changed but looks awfully stretched.
A few weeks ago i made a report that the games didn't show any sprites, that has changed since, might change again due to the WIP nature of forced Experimental.
Experimental now causes all games to show up as a black screen, even though intro FMVs work.
Should get fixed eventually, it's been very on and off with Experimental and these Legacy Collections. Base proton works fine for gameplay but the FMVs all lack audio.
Fairly power hungry for a glorified emulator... 15W when playing Megaman X (SNES) is a lot! But it runs fine so far...
Works great on experimental! X4 FMVs work as far as i know but you will have to forgo the trailers and Day of Sigma. should get better soon!
FMVs for most trailers and Day of Sigma don't work.
Tried the protontricks method mentioned but protontricks kept freezing on me, doing that properly may reap better results.
Each games works well with not many issues. The only problem is Mega Man X4 FMVs have no audio, hampering the experience.
FMVs in Mega Man X 4 lack any audio.
This report was made playing through two stages in Mega Man X and Mega Man X4.
Tried to limit TDP. Didn't help much
It runs ok. But it draws a ridiculous amount of power considering how old and simple these games are. When testing Megaman X it drew a staggering 15-20W. Which is nuts when compared to running the same game on SNES9X emulator where it only draws around 6-7W