Comment 0 for bug 1762940

For all(as I know) Huawei servers, the vga adapter are embed in the iBMC chips. Those server can install from ISO manually for 16.04.4 and screen display normally. But for 18.04 ( tested both for daily and final beta)version, the install screen is blur. One of tested server is Huawei 2855 v5, the certification link for 16.04 are https://certification.ubuntu.com/hardware/201707-25596/.

Below are key difference of dmesg. It seems might related with DRM.

18.04 install screen is blur
dmesg
...
[ 2.039009] fb0: EFI VGA frame buffer device
...
[ 4.178058] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
[ 4.191435] [drm] No driver support for vblank timestamp query.
[ 4.209338] checking generic (90000000 300000) vs hw (0 0)
[ 4.209384] fbcon: hibmcdrmfb (fb1) is primary device
[ 4.209385] fbcon: Remapping primary device, fb1, to tty 1-63
...
[ 5.357024] hibmc-drm 0000:07:00.0: fb1: hibmcdrmfb frame buffer device
[ 5.380085] [drm] Initialized hibmc 1.0.0 20160828 for 0000:07:00.0 on minor 0
...
[ 5.636624] vga16fb: initializing
[ 5.636627] vga16fb: mapped to 0x0000000048a7a1d2
[ 5.636630] checking generic (90000000 300000) vs hw (a0000 10000)
[ 5.636676] fb2: VGA16 VGA frame buffer device
...

16.04.4 install screen is fine (no screen blur)
dmesg
...
[ 2.000419] fb0: EFI VGA frame buffer device
....
[ 8.795065] vga16fb: initializing
[ 8.795068] vga16fb: mapped to 0xffff8800000a0000
[ 8.795071] checking generic (98000000 300000) vs hw (a0000 10000)
[ 8.795121] fb1: VGA16 VGA frame buffer device
...