Viewing Issue Advanced Details
ID Category [?] Severity [?] Reproducibility Date Submitted Last Update
08659 Interface Minor Always Jun 7, 2023, 21:18 Jul 11, 2023, 11:14
Tester ICEknight View Status Public Platform MAME (Official Binary)
Assigned To Resolution Open OS Windows 10/11 (64-bit)
Status [?] Acknowledged Driver
Version 0.255 Fixed in Version Build 64-bit
Fixed in Git Commit Github Pull Request #
Summary 08659: opengl, bgfx: All but one screen start minimized when numscreens > 1 and windowed mode is disabled
Description Only when using opengl and bgfx video modes, setting numscreens to 2 or higher and having windowed mode turned off will only show one of the screens in full screen mode. The menu screen must be manually reached to see.
Windowed mode works fine.
Steps To Reproduce Open mame.ini.
Set video to opengl or bgfx.
Set window to 0.
Set numscreens to 2 or higher.
Start MAME. Only one of the (blank) windows will start in full screen.
Additional Information
Github Commit
Regression Version
Affected Sets / Systems
Attached Files
There are no relationship linked to this issue.
User avatar
Senior Tester
Jun 8, 2023, 02:22
Do you physically have the number of monitors that you're specifying? I've already been told that if you don't then this issue is invalid.
User avatar
Jun 8, 2023, 18:20
I have three.
User avatar
Jun 8, 2023, 18:24
I can’t reproduce this. It works correctly for me as long as the "numscreens" value is no larger than the number of physical displays.
User avatar
Jun 9, 2023, 18:58
edited on: Jun 9, 2023, 19:02
Happens to me with:
- 2 monitors and numscreens 2
- 3 monitors and numscreens 2
- 3 monitors and numscreens 3

Specifying a higher numscreens than the number of monitors creates minimized windows only (and shouldn't be done anyway).