Drm: mgag200. Video adapter issue with 5.4.0-rc3 ; no graphics

[Thomas Zimmermann]

Hi John,

apparently the vgaarb was not the problem.

Am 07.11.19 um 03:29 schrieb 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.    Specifically  starting the GNOME desktop. 

When you say "text mode", do you mean VGA text mode or the graphical
console that emulates text mode?

When you enable graphics mode, does it set the correct resolution? A lot
of work went into memory management recently. I could imagine that the
driver sets the correct resolution, but then fails to display the
correct framebuffer.

If possible, could you try to update to the latest drm-tip and attach
the output of

  /sys/kernel/debug/dri/0/vram-mm

before and after switching to graphics mode. The file lists the
allocated regions of the VRAM.

> 
> This adapter is  Server Engines  Integrated Remote Video Acceleration Subsystem (RVAS)  and is used as remote console in iLO/DRAC environments.  
> 
> I don’t see any specific errors in the gdm logs or message file other than this:

You can boot with drm.debug=0xff on the kernel command line to enable
more warnings.

> 
> 
> 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 

Could you please attach the output of lspci -v for the VGA adapter?

Best regards
Thomas

> 
> 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 with  4.18  kernels  and a recent Linux  5.2.18 ;  The symptom first appears in 5.3.6. and onward. 
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> 

-- 
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Maxfeldstr. 5, 90409 Nürnberg, Germany
(HRB 36809, AG Nürnberg)
Geschäftsführer: Felix Imendörffer

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