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. > _______________________________________________ > dri-devel mailing list > dri-devel@xxxxxxxxxxxxxxxxxxxxx > https://lists.freedesktop.org/mailman/listinfo/dri-devel > -- 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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