Nouveau - Jun 2013 - [Bug 66129] New: [BISECTED] nouveau, nv50: dual display doesn't work in 3.9

https://bugs.freedesktop.org/show_bug.cgi?id=66129

          Priority: medium
            Bug ID: 66129
                CC: drewfrank at gmail.com, joshuabaergen at gmail.com,
                    wippbox at gmx.net
          Assignee: nouveau at lists.freedesktop.org
           Summary: [BISECTED] nouveau, nv50: dual display doesn't work in
                    3.9
        QA Contact: xorg-team at lists.x.org
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: corsac at debian.org
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: git
         Component: Driver/nouveau
        Depends on: 64904
           Product: xorg

+++ This bug was initially created as a clone of Bug #64904 +++

(In reply to comment #19)
> I seem to have much of the same problem.as this, but this fix does not seem
> to work for me.
> 
> I just installed kernel 3.9.7 which have these fixes included. And I still
> have the same problem.
> 
> I am running a Dell desktop with  NVIDA Quadro NVS 295 graphic card and two
> identical Dell monitors attached via DisplayPort.
> 
> I run Fedora 18 with all latest updates and using Nouveau drivers.
> 
> Starting with Kernel 3.8.11 it boots OK and both monitors works as
expected.
> Starting with Kernel 3.9.2-3.9.7 it boots, but when trying to display
> anything on monitor two it gets into problems.
> 
> It boots until its tries to start the Xorg server and then monitor 2 starts
> flickering on and off. Monitor 1 stays with the boot logo of fedora.
> 
> Also during boot when booting I only have the boot logo of fedora on
monitor
> 1
> when running kernel 3.9.x while I have it on both screens when running
kernel
> 3.8.11
> 
> I am able to hit CTRL+f2 to get a text login.
> 
> Is having two monitor different from having an external VGA?
I have the same issue so I took the liberty to clone this bug.

I also have a DELL desktop with:

02:00.0 VGA compatible controller [0300]: NVIDIA Corporation G86 [Quadro NVS
290] [10de:042f] (rev a1)

Starting 3.9, dual screen doesn't work anymore (screen stays blank or
doesn't
not start at all) and vt switch takes some time. I've bisected the issue and
here are the results:

# bad: [c1be5a5b1b355d40e6cf79cc979eb66dafa24ad1] Linux 3.9
# good: [19f949f52599ba7c3f67a5897ac6be14bfcb1200] Linux 3.8
git bisect start 'v3.9' 'v3.8'
# good: [d778df51c09264076fe0208c099ef7d428f21790] mm: vmscan: save work
scanning (almost) empty LRU lists
git bisect good d778df51c09264076fe0208c099ef7d428f21790
# bad: [ee89f81252179dcbf6cd65bd48299f5e52292d88] Merge branch
'for-3.9/core'
of git://git.kernel.dk/linux-block
git bisect bad ee89f81252179dcbf6cd65bd48299f5e52292d88
# good: [69086a78bdc973ec0b722be790b146e84ba8a8c4] Merge branch
'for-linus' of
git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
git bisect good 69086a78bdc973ec0b722be790b146e84ba8a8c4
# bad: [ed5dc2372dba46e0ecd08791b1a0399d313e5cff] Merge tag
'mmc-updates-for-3.9-rc1' of
git://git.kernel.org/pub/scm/linux/kernel/git/cjb/mmc
git bisect bad ed5dc2372dba46e0ecd08791b1a0399d313e5cff
# bad: [1f3a574a4bfe86ebf7d51fac37e0668397372fd8] Merge branch
'drm-nouveau-next' of
git://anongit.freedesktop.org/git/nouveau/linux-2.6 into
drm-next
git bisect bad 1f3a574a4bfe86ebf7d51fac37e0668397372fd8
# good: [cd17ef4114ad5c514b17e6a0bb02a309ab90b692] Merge tag
'drm-intel-next-2013-02-01' of
git://people.freedesktop.org/~danvet/drm-intel
into drm-next
git bisect good cd17ef4114ad5c514b17e6a0bb02a309ab90b692
# good: [210561ffd72d00eccf12c0131b8024d5436bae95] intel/iommu: force
writebuffer-flush quirk on Gen 4 Chipsets
git bisect good 210561ffd72d00eccf12c0131b8024d5436bae95
# good: [0f0800661a125ddb038462570c869fe6f8ab5737] drm/nouveau/gpio: pass
number of on-die gpio lines to base
git bisect good 0f0800661a125ddb038462570c869fe6f8ab5737
# good: [35f8badc1cf652381fa3f82c1fbea39f4dbe87fd] drm: Don't set the
plane->fb
to NULL on successfull set_plane
git bisect good 35f8badc1cf652381fa3f82c1fbea39f4dbe87fd
# good: [31a34aa421032cfe3b2b892c929e7539e747a7ac] drm/nouveau/i2c: aux
channels not necessarily on nvio
git bisect good 31a34aa421032cfe3b2b892c929e7539e747a7ac
# good: [0a0afd282fd715dd63d64b243299a64da14f8e8d] drm/nv50-/disp: move DP link
training to core and train from supervisor
git bisect good 0a0afd282fd715dd63d64b243299a64da14f8e8d
# bad: [eb6313add6dddf07ea3e50c4caa33a9c3b2379f1] drm/nv50: initial kms support
for off-chip TMDS/DP encoders
git bisect bad eb6313add6dddf07ea3e50c4caa33a9c3b2379f1
# good: [a2bc283f3905389ba53962a2bbb05ede0c16193d] drm/nv50-/disp: initial work
towards supporting external encoders
git bisect good a2bc283f3905389ba53962a2bbb05ede0c16193d
# bad: [476e84e126171d809f9c0b5d97137f5055f95ca8] drm/nv50-/disp: initial
supervisor support for off-chip encoders
git bisect bad 476e84e126171d809f9c0b5d97137f5055f95ca8
# first bad commit: [476e84e126171d809f9c0b5d97137f5055f95ca8] drm/nv50-/disp:
initial supervisor support for off-chip encoders
# bad: [476e84e126171d809f9c0b5d97137f5055f95ca8] drm/nv50-/disp: initial
supervisor support for off-chip encoders
git bisect bad 476e84e126171d809f9c0b5d97137f5055f95ca8
# first bad commit: [476e84e126171d809f9c0b5d97137f5055f95ca8] drm/nv50-/disp:
initial supervisor support for off-chip encoders
# bad: [476e84e126171d809f9c0b5d97137f5055f95ca8] drm/nv50-/disp: initial
supervisor support for off-chip encoders
git bisect bad 476e84e126171d809f9c0b5d97137f5055f95ca8
# first bad commit: [476e84e126171d809f9c0b5d97137f5055f95ca8] drm/nv50-/disp:
initial supervisor support for off-chip encoders

And:

476e84e126171d809f9c0b5d97137f5055f95ca8 is the first bad commit
commit 476e84e126171d809f9c0b5d97137f5055f95ca8
Author: Ben Skeggs <bskeggs at redhat.com>
Date:   Mon Feb 11 09:24:23 2013 +1000

    drm/nv50-/disp: initial supervisor support for off-chip encoders

    Signed-off-by: Ben Skeggs <bskeggs at redhat.com>

:040000 040000 9a28e3a997b96d2581ff81f5e0b97a9fc4f07917
41f69d26a80082e19d3c76e6556ad5ef9eb2677d M    drivers

Unfortunately it doesn't seem easy to just revert
476e84e126171d809f9c0b5d97137f5055f95ca8. If you need more info/debugging,
please ask.

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Yves-Alexis <corsac at debian.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |per.arnold at blaasmo.no

--- Comment #1 from Yves-Alexis <corsac at debian.org> ---
Adding Per Arnold Blaasmo to CC since he seems to have the same issue.

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Emil Velikov <emil.l.velikov at gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |NEEDINFO

--- Comment #2 from Emil Velikov <emil.l.velikov at gmail.com> ---
Yves-Alexis thanks for the bisection log

Note that Bug #64904 is about broken logic wrt VGA detection, and as far as I
can see Display port is not the same as VGA :) (Per Arnold Blaasmo) 

Before proceeding make sure that you have the patches from the above bug
(either apply manually or upstream 3.9.7 & 3.10-rc7)

Firstly can you try single head, and confirm if nouveau works correctly for
each monitor plugged into it's respective connector

Secondly please attach the output of dmesg for working and non-working setup.
vbios might be useful as well [1]

Lastly please be more explicit as to what the issue is
"Starting 3.9, dual screen doesn't work anymore (screen stays blank or
doesn't
not start at all)"

* Which screen stays black, is it connected using VGA, 

Cheers
Emil

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--- Comment #3 from Emil Velikov <emil.l.velikov at gmail.com> ---
[1] http://nouveau.freedesktop.org/wiki/DumpingVideoBios/

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--- Comment #4 from Per Arnold Blaasmo <per.arnold at blaasmo.no> ---
Created attachment 81508
  --> https://bugs.freedesktop.org/attachment.cgi?id=81508&action=edit
Dmesg using kernel 3.8.11 (good)

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--- Comment #5 from Per Arnold Blaasmo <per.arnold at blaasmo.no> ---
Created attachment 81509
  --> https://bugs.freedesktop.org/attachment.cgi?id=81509&action=edit
Dmesg using kernel 3.9.4 (bad)

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--- Comment #6 from Per Arnold Blaasmo <per.arnold at blaasmo.no> ---
I just started my summer vacation :-)'
So I am not able to test using each monitor as single head right now.
I will do that when I am back around 15.July.

I the mean time I have uploaded the dmesg from running with kernel 3.8.1 and
3.9.4. 

3.8.11 is the last kernel that give me good result.
I have tested with kernel 3.9.7, but have the same result as with other 3.9.x
kernels.

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--- Comment #7 from Emil Velikov <emil.l.velikov at gmail.com> ---
Per Arnold Blaasmo

Enjoy your vacation, shame you did not manage to confirm if the commit
476e84e126171d809f9c0b5d97137f5055f95ca8 is indeed the one causing your issue ?

Please feel free to try the monitors individually and attach your vbios when
you have the chance.

Yves-Alexis
It would still be beneficial if one complete set of logs + vbios is available

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--- Comment #8 from Yves-Alexis <corsac at debian.org> ---
Created attachment 81530
  --> https://bugs.freedesktop.org/attachment.cgi?id=81530&action=edit
dmesg with 3.10-rc7 (bad)

(In reply to comment #2)
> Yves-Alexis thanks for the bisection log
> 
> Note that Bug #64904 is about broken logic wrt VGA detection, and as far as
> I can see Display port is not the same as VGA :) (Per Arnold Blaasmo) 
> 
> Before proceeding make sure that you have the patches from the above bug
> (either apply manually or upstream 3.9.7 & 3.10-rc7)
Ok, this comment is about 3.10-rc7.
> 
> Firstly can you try single head, and confirm if nouveau works correctly for
> each monitor plugged into it's respective connector
No. Only the monitor plugged to the first connector is working (actually
there's only one proprietary connector on the card itself, and I have some
kind
of adapter with two VGA outputs).
> 
> Secondly please attach the output of dmesg for working and non-working
> setup. vbios might be useful as well [1]
Attached.
> 
> Lastly please be more explicit as to what the issue is
> "Starting 3.9, dual screen doesn't work anymore (screen stays
blank or
> doesn't not start at all)"
> 
> * Which screen stays black, is it connected using VGA, 
The monitor plugged to the second connector stays black. Xorg doesn't even
start.

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--- Comment #9 from Yves-Alexis <corsac at debian.org> ---
Created attachment 81536
  --> https://bugs.freedesktop.org/attachment.cgi?id=81536&action=edit
dmesg with 3.8.0-rc6-00083-ga2bc283

(In reply to comment #2)
> Secondly please attach the output of dmesg for working and non-working
> setup. vbios might be useful as well [1]
Here's the working case (commit ga2bc283 just before the bad one)

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--- Comment #10 from Per Arnold Blaasmo <per.arnold at blaasmo.no> ---
Just a quick comment.
I my case both monitors is connected via displayport, and there are two
separate displayports on my graphic card. I do not use a splitter cable of any
sort.

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--- Comment #11 from Yves-Alexis <corsac at debian.org> ---
Created attachment 81537
  --> https://bugs.freedesktop.org/attachment.cgi?id=81537&action=edit
dmesg with 3.8.0-rc6-00084-g476e84e

(In reply to comment #2)
> Secondly please attach the output of dmesg for working and non-working
> setup. vbios might be useful as well [1]
Here's the non working case (second monitor stays blank/off and Xorg
doesn't
start). This is with commit 476e84e (first bad commit).

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--- Comment #12 from Emil Velikov <emil.l.velikov at gmail.com> ---
Some notes from the log(s)

* 2x DCB_OUTPUT_TMDS
* 2x DCB_OUTPUT_ANALOG
All of which onchip
* 2x DCB_CONNECTOR_DVI_I

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--- Comment #13 from Emil Velikov <emil.l.velikov at gmail.com> ---
Created attachment 81580
  --> https://bugs.freedesktop.org/attachment.cgi?id=81580&action=edit
sprinkle some printfs on top of non-working commin

"Proprietary connector" - is it a DMS-59[1] by any chance ?

Can you apply this patch on top of the offending commit and attach the dmesg


[1] http://en.wikipedia.org/wiki/DMS-59

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Emil Velikov <emil.l.velikov at gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEEDINFO                    |ASSIGNED
           Assignee|nouveau at lists.freedesktop.o |emil.l.velikov at gmail.com
                   |rg                          |

--- Comment #14 from Emil Velikov <emil.l.velikov at gmail.com> ---
Created attachment 81581
  --> https://bugs.freedesktop.org/attachment.cgi?id=81581&action=edit
sprinkle some printfs on top of working commit

Apply this patch on top of the _working_ commit and attach dmesg

Note: patches may contain some typos

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