Drm: mgag200. Video adapter issue with 5.4.0-rc3

[John Donnelly]

Hi,

I am investigating an issue where we lose video activity when the display is switched from from “text mode” to “graphic mode” 
on a number of  servers using this driver.  

This adapter is  Server Engines  integrated Remote Video Acceleration Subsystem (RVAS)   is used primarily as remote console , iLO/DRAC environments.  

I was wondering if anyone  could offer any suggestions where to look at . I don’t see any specific errors in the gdm logs or message file other than this:


mgag200 0000:04:00.0: remove_conflicting_pci_framebuffers: bar 0: 0x9b000000 -> 0x9bffffff 
mgag200 0000:04:00.0: remove_conflicting_pci_framebuffers: bar 1: 0x9c810000 -> 0x9c813fff 
mgag200 0000:04:00.0: remove_conflicting_pci_framebuffers: bar 2: 0x9c000000 -> 0x9c7fffff 
fb0: switching to mgag200drmfb from EFI VGA 
mgag200 0000:04:00.0: vgaarb: deactivate vga console 
fbcon: mgag200drmfb (fb0) is primary device 
mgag200 0000:04:00.0: fb0: mgag200drmfb frame buffer device 
[drm] Initialized mgag200 1.0.0 20110418 for 0000:04:00.0 on minor 0

The systems worked fine 4.18  kernels