Emulator

Game Name?
Presumably all games
Specifically tried: Simpsons Hit and Run, Gauntlet Dark Legacy, Phantasy Star Online Episode I & II

Game ID?
GHQE7D

MD5 Hash?
6715b9a3e20592b832643c9fcdb51435

What's the problem? Describe what went wrong.
I'm trying to run GameCube games on the Steam Deck using Dolphin (installed through EmuDeck). The games run fine, but I noticed they are stretched vertically. Setting the aspect ratio to auto or 4:3 results in an aspect ratio taller than 4:3. Setting it to stretch or 16:9 results in full screen rendering. I think there is some issue with how Dolphin is interacting with SteamOS when it comes to full screen rendering.

I've tried this in the Steam Deck's gaming mode (the standard SteamOS UI) and also its desktop. The result is the same. Note that SNES and N64 games have proper aspect ratios through RetroArch.

What steps will reproduce the problem?

1. Install Dolphin on the Steam Deck (not sure if EmuDeck configuration causes this problem or if a standalone Dolphin install would be the same)
2. Add a GameCube game
3. Set the aspect ratio to 4:3 or auto
4. Run it in full screen mode

Is the issue present in the latest development version?
Not sure.

Is the issue present in the latest stable version?
Not sure. This is 5.0-17210 installed 2 weeks ago.

**If your issue is a graphical issue, please attach screenshots and record a three frame fifolog of the issue if possible.

Photo of the Steam Deck attached. Included a photo of a PC running the game at the correct aspect ratio (4:3).

What are your PC specifications? (CPU, GPU, Operating System, more)
Steam Deck
Zen 2
AMD RDNA 2
SteamOS
1280x800 screen (16:10)

Is there anything else that can help developers narrow down the issue? (e.g. logs, screenshots,
configuration files, savefiles, savestates)
This was installed through EmuDeck and I'm not sure how many things it configures for each individual emulator. If installing this on its own works fine on the Steam Deck, then the developer(s) of EmuDeck should be informed of whatever is causing the issue on their end as most people running this on the deck will probably use EmuDeck for installation.