Comment 11 for bug 1968519

On a Dell PowerEdge R210 II server I have the same problem:
- Ubuntu 22.04 server launched from a liveusb: The screen remains black after loading the kernel
- Ubuntu 22.04 desktop launched from a liveusb: The screen remains black after loading the kernel
- Update Ubuntu 22.04 server on Ubuntu 21.10 server: The screen is black on reboot while ok under Ubuntu 21.10. Ssh is ok.

03:03.0 VGA compatible controller: Matrox Electronics Systems Ltd. MGA G200eW WPCM450 (rev 0a) (prog-if 00 [VGA controller])
 DeviceName: Embedded Video
 Subsystem: Dell MGA G200eW WPCM450
 Flags: bus master, medium devsel, latency 0, IRQ 19, IOMMU group 5
 Memory at c4000000 (32-bit, prefetchable) [size=8M]
 Memory at c5000000 (32-bit, non-prefetchable) [size=16K]
 Memory at c4800000 (32-bit, non-prefetchable) [size=8M]
 Expansion ROM at 000c0000 [disabled] [size=128K]
 Capabilities: [dc] Power Management version 1
 Kernel driver in use: mgag200
 Kernel modules: matroxfb_base, mgag200

$ sudo dmesg | grep -i mgag200
[ 3.030128] fb0: switching to mgag200 from EFI VGA
[ 3.046095] mgag200 0000:03:03.0: vgaarb: deactivate vga console
[ 3.049400] [drm] Initialized mgag200 1.0.0 20110418 for 0000:03:03.0 on minor 0
[ 3.051146] fbcon: mgag200drmfb (fb0) is primary device
[ 3.051975] mgag200 0000:03:03.0: [drm] drm_plane_enable_fb_damage_clips() not called
[ 3.502482] mgag200 0000:03:03.0: [drm] fb0: mgag200drmfb frame buffer device

$ uname -a
Linux serveur 5.15.0-27-generic #28-Ubuntu SMP Thu Apr 14 04:55:28 UTC 2022 x86_64 x86_64 x86_64 GNU/Linux