Modesetting (amdgpudrmfb) artifacts on RAVEN APU

[KARBOWSKI Piotr]

On 2018-03-07 20:12, Harry Wentland wrote:
> Thanks for testing.
> 
> What do you mean with broken video? I tried going back in the email thread but I'm not 100% clear what you mean by this.
> 
> BTW, drm-fixes-4.16 are fixes we intend to get into the 4.16 upstream kernel. amd-staging-drm-next is our development tree and quite a bit farther ahead in development. I'm trying to find fixes to backmerge to 4.16 to make everyone happy when it releases.

Like on those screenshots


     https://i.imgur.com/qnDOKY7.jpg
     https://i.imgur.com/XH42zit.jpg

To describe it better, lets split the screen into 4 segments

+-----+-----+
|  A  |  B  |
+-----+-----+
|  C  |  D  |
+-----+-----+

The screen resolution kicks in as it should, 1080p, then A displays 
proper part of screen, around 25%, then B contain a copy of what A 
displays, so the same 25% of top-left part of screen, then C and D 
remain black, if I scroll the screen a bit, C and D an get a bold 
vertical line of whatever color was on screen, if I had a white/gray 
font, it will be it, if there was some blue text, it will be blue until 
I scroll a bit more.


drm-fixes-4.16 yield the same effect as amd-staging-drm-next without 
0001-drm-amd-display-Fix-takeover-from-VGA-mode.patch, but it seems that 
htis patch is already in drm-fixes-4.16 so I am confused.

-- Piotr.