Nouveau - Apr 2016 - [Bug 94832] New: Reverse Prime corruption with nouveau using radeon outputs

https://bugs.freedesktop.org/show_bug.cgi?id=94832

            Bug ID: 94832
           Summary: Reverse Prime corruption with nouveau using radeon
                    outputs
           Product: xorg
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/nouveau
          Assignee: nouveau at lists.freedesktop.org
          Reporter: haagch at frickel.club
        QA Contact: xorg-team at lists.x.org

Created attachment 122732
  --> https://bugs.freedesktop.org/attachment.cgi?id=122732&action=edit
photo with screen corruption

I have these two (old) GPUs:

00:0d.0 VGA compatible controller: NVIDIA Corporation C61 [GeForce 6150SE
nForce 430] (rev a2)
02:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] RV370
[Radeon X300]

After startup my desktop runs on the nvidia gpu.
I enable prime with these commands:

xrandr --setprovideroutputsource radeon nouveau
xrandr --output VGA-2 --auto  --output DVI-1-0 --right-of VGA-2 --mode
1280x1024

It seems to almost work, but the monitor connected to the radeon gpu is very
corrupted, see attached image.

Software:

linux 4.5
xf86-video-nouveau 1.0.12
xf86-video-ati 1:7.6.1
xorg-server 1.18.3
xfwm4 4.12.3 with compositor enabled

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--- Comment #1 from Christoph Haag <haagch at frickel.club> ---
Created attachment 122733
  --> https://bugs.freedesktop.org/attachment.cgi?id=122733&action=edit
screenshot with no corruption

On a screenshot there is no corruption visible.

Some artifacts were visible when I first had different resolutions for the
monitors and dragged a window, there would be some artifacts left where the
window was, but the windows itself looked fine.

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Ilia Mirkin <imirkin at alum.mit.edu> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
 Attachment #122732|text/plain                  |image/jpeg
          mime type|                            |

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Ilia Mirkin <imirkin at alum.mit.edu> changed:

           What    |Removed                     |Added
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 Attachment #122733|text/plain                  |image/png
          mime type|                            |

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--- Comment #2 from Ilia Mirkin <imirkin at alum.mit.edu> ---
I'm confused by what's going on in your setup... can you also include
the
output of 'xrandr' and your Xorg log? That should clear things up.

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--- Comment #3 from Christoph Haag <haagch at frickel.club> ---
Created attachment 122734
  --> https://bugs.freedesktop.org/attachment.cgi?id=122734&action=edit
xrandr commands

These are the commands I enter. I run X on an nvidia GPU and then I want to use
a monitor that is connected to a radeon GPU.

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--- Comment #4 from Christoph Haag <haagch at frickel.club> ---
Created attachment 122735
  --> https://bugs.freedesktop.org/attachment.cgi?id=122735&action=edit
xorg log

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--- Comment #5 from Christoph Haag <haagch at frickel.club> ---
Created attachment 122736
  --> https://bugs.freedesktop.org/attachment.cgi?id=122736&action=edit
dmesg

Somehow I forgot to check dmesg.

I guess the
[   39.172099] nouveau 0000:00:0d.0: bus: MMIO write of 007c0001 FAULT at
00b010
indicate a problem...

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--- Comment #6 from Ilia Mirkin <imirkin at alum.mit.edu> ---
(In reply to Christoph Haag from comment #5)
> Created attachment 122736 [details]
> dmesg
> 
> Somehow I forgot to check dmesg.
> 
> I guess the
> [   39.172099] nouveau 0000:00:0d.0: bus: MMIO write of 007c0001 FAULT at
> 00b010
> indicate a problem...
Nope, that's expected. Something weird with the PMPEG unit on the cards.
Although usually the errors happen just once at boot... dunno.

And to further clarify, you get the corruption as in the photo no matter what
once you enable the second screen? Given what the photo looks like, seems like
there's an issue with strides... perhaps the fb stride isn't being
propagated
properly? All the dispnv04 code is pretty much stuck in antiquity unfortunately
=/ And none of the PRIME stuff has been tested with pre-G80 GPUs.

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--- Comment #7 from Christoph Haag <haagch at frickel.club> ---
Created attachment 122737
  --> https://bugs.freedesktop.org/attachment.cgi?id=122737&action=edit
journal from running reverse prime from radeon

This may be a different problem, but when I try it the other way around by
adding /etc/X11/xorg.conf.d/20-radeon.conf with

Section "Device"
    Identifier     "Device0"
    Driver         "radeon"
    BusID          "PCI:2:0:0"
EndSection
Section "Device"
    Identifier     "Device1"
    Driver         "nouveau"
    BusID          "PCI:0:0:d"
EndSection

then X starts on my radeon gpu. Then I can do
xrandr --setprovideroutputsource radeon nouveau
and then
xrandr --output VGA-1-2 --auto --output DVI-0 --right-of VGA-1-2 --mode
1280x1024
then I get pretty gruesome messages in dmesg.

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--- Comment #8 from Christoph Haag <haagch at frickel.club> ---
(In reply to Ilia Mirkin from comment #6)
> And to further clarify, you get the corruption as in the photo no matter
> what once you enable the second screen?
Looks like it. Well, I am not *really* going to use that computer, I am just
experimenting with PRIME. So if there are no real users, it might not be worth
the time to debug this.

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--- Comment #9 from danon at gmx.de ---
Same problem here, try build a multi monitor setup with a 6600 LE (nouveau) and
a Radeon 2400 Pro (radeon). Xinemara works fine, but Reverse PRIME does not.

When i try to render nouveau -> radeon i get a segfault.
When i try to render radeon -> nouveau i get glitches, similar to the one
Christoph Haag posted.

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Martin Peres <martin.peres at free.fr> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |MOVED

--- Comment #10 from Martin Peres <martin.peres at free.fr> ---
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