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[V43.1] Using two screens on an AMD R9 380x graphics card can result in a black screen #16149

Description

@coffeetion

Batocera build version

x86_64-43.1-20260529

Your architecture

X86_64

Your Graphic Processor Unit(s) (GPU)

intel 4790K and AMD R9 380x

Issue description

When starting Batocera, a black screen appears after the startup screen.

Detailed reproduction steps

I installed the latest version of the official image (V43.1) on an X86 PC device, which has a graphics card with two video output ports, DP and HDMI. When using DP alone to input video, everything was normal. When I plugged in a landscape display for the HDMI port to display MARQUEE after booting up, it was still normal, and the secondary screen also displayed MARQUEE normally.
But when I restart my PC, it will enter a black screen state after the Batocera logo screen. At this time, I can enter the file system through another computer \ \ IP and also use SSH to input commands, but it takes several minutes to receive feedback after entering the SSH command.
Repeat several times, all after inserting both DP and HDMI into the monitor, restart and enter black screen state.

Details of any attempts to fix this yourself

Attempted to modify the resolution in batocella.conf, but failed to fix it;
The batocera solution setOutput command for SSH to set the input port could not be fixed;
Downgrade to install V41 version, fix the issue, can be used normally, dual screens display normally;
After installing version V41, the system's upgrade program automatically upgraded to version V43.1, but the problem persisted;
Upgrade to V44 test version, but the problem persists;
Turn off the integrated graphics card and secure boot in the motherboard BIOS, but the problem persists;
Replace with another computer for installation, with hardware of B350 motherboard+amd2200G, dual HDMI output, tested dual screens, completely normal.

Details of any modifications you have made to Batocera.

No modifications have been made

Logs and data

batocera-support-20260726065825.tar.gz

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