Nouveau - May 2011 - [Bug 37669] New: [NVAC] problem when disabling external monitor

https://bugs.freedesktop.org/show_bug.cgi?id=37669

           Summary: [NVAC] problem when disabling external monitor
           Product: xorg
           Version: unspecified
          Platform: Other
        OS/Version: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/nouveau
        AssignedTo: nouveau at lists.freedesktop.org
        ReportedBy: a.reversat at gmail.com
         QAContact: xorg-team at lists.x.org


Created an attachment (id=47232)
 --> (https://bugs.freedesktop.org/attachment.cgi?id=47232)
Dmesg after external monitor disabled

I have a macbook 5,1 with an NVAC card (02:00.0 VGA compatible controller:
nVidia Corporation C79 [GeForce 9400M] (rev b1))

When I unplug my external monitor (plugged through a mini display port -> dvi
adapter) my window manager tries to disable the external screen resulting in my
main screen flickering and being unusable (only the cursor moves).

Attached is the output of dmesg after it has happened (I was still able to
access the machine through ssh).

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Marcin Slusarz <marcin.slusarz at gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
  Attachment #47232|text/x-log                  |text/plain
          mime type|                            |

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https://bugs.freedesktop.org/show_bug.cgi?id=37669

--- Comment #1 from Antoine Reversat <a.reversat at gmail.com> 2011-12-06
11:44:37 PST ---
So I started looking deeper into this issue and it's probably somewhat
low-level as if I boot my computer into a console and load the nouveau driver
then unplug DP-1 the same flickering happens (but re-pluging the monitor on
DP-1 stops the flickering). I'll attach a demsg output with drm.debug=0x07
there's some interresting things specialy (I think) these lines :

checking generic (c0010000 640000) vs hw (c0000000 10000000)

and then 

Dec  6 10:55:25 antoine-MacBook kernel: [   15.878616] [drm] nouveau
0000:02:00.0: Register 0x00004028 not found in PLL limits table
Dec  6 10:55:25 antoine-MacBook kernel: [   15.878622] [drm] nouveau
0000:02:00.0: Register 0x00004008 not found in PLL limits table
Dec  6 10:55:25 antoine-MacBook kernel: [   15.878630] [drm] nouveau
0000:02:00.0: Register 0x00004030 not found in PLL limits table

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--- Comment #2 from Antoine Reversat <a.reversat at gmail.com> 2011-12-06
11:47:24 PST ---
Created attachment 54156
  --> https://bugs.freedesktop.org/attachment.cgi?id=54156
Dmesg with drm.debug=0x07 with several connect/disconnect

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Antoine Reversat <a.reversat at gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|[NVAC] problem when         |[NVAC] problem when
                   |disabling external monitor  |unplugging DP-1

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--- Comment #3 from Antoine Reversat <a.reversat at gmail.com> 2011-12-08
08:31:34 PST ---
Created attachment 54243
  --> https://bugs.freedesktop.org/attachment.cgi?id=54243
dmesg with drm.debug=15 and nouveau.reg_debug=0x200 1 unplug/replug

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--- Comment #4 from Antoine Reversat <a.reversat at gmail.com> 2011-12-15
07:38:18 PST ---
Created attachment 54465
  --> https://bugs.freedesktop.org/attachment.cgi?id=54465
vbios

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--- Comment #5 from Antoine Reversat <a.reversat at gmail.com> 2011-12-15
07:47:52 PST ---
So I've gotten a bit further.

I tracked down the code that triggers the issue : it's this part of
nv50_sor.c
:

        if (!nv_wait(dev, NV50_PDISPLAY_SOR_DPMS_CTRL(or),
                    NV50_PDISPLAY_SOR_DPMS_CTRL_PENDING, 0)) {
            NV_ERROR(dev, "timeout: SOR_DPMS_CTRL_PENDING(%d) == 0\n",
or);
            NV_ERROR(dev, "SOR_DPMS_CTRL(%d) = 0x%08x\n", or,
                    nv_rd32(dev, NV50_PDISPLAY_SOR_DPMS_CTRL(or)));
        }

        val = nv_rd32(dev, NV50_PDISPLAY_SOR_DPMS_CTRL(or));

        if (mode == DRM_MODE_DPMS_ON)
            val |= NV50_PDISPLAY_SOR_DPMS_CTRL_ON;
        else
            val &= ~NV50_PDISPLAY_SOR_DPMS_CTRL_ON;

        nv_wr32(dev, NV50_PDISPLAY_SOR_DPMS_CTRL(or), val |
                NV50_PDISPLAY_SOR_DPMS_CTRL_PENDING);
        if (!nv_wait(dev, NV50_PDISPLAY_SOR_DPMS_STATE(or),
                    NV50_PDISPLAY_SOR_DPMS_STATE_WAIT, 0)) {
            NV_ERROR(dev, "timeout: SOR_DPMS_STATE_WAIT(%d) == 0\n",
or);
            NV_ERROR(dev, "SOR_DPMS_STATE(%d) = 0x%08x\n", or,
                    nv_rd32(dev, NV50_PDISPLAY_SOR_DPMS_STATE(or)));
        }


If I add an if to skip the code if the sor is going to DPMS off and the encoder
type is tmds then the bug doesn't happen anymore. I don't understand how
this
affects sor0 (which the LVDS output is using) as the code seems pretty sane.

I also noted something and am not sure whether it's correct or not. My flat
panel is connected through a DP-DVI adapter but nv_encoder->dcb->type is
OUTPUT_TMDS not OUTPUT_DP. Is this due to the fact that it's "DVI over
DP" ? Or
is this not normal ?

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

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

--- Comment #6 from Ilia Mirkin <imirkin at alum.mit.edu> ---
It appears that this bug report has laid dormant for quite a while. Sorry we
haven't gotten to it. Since we fix bugs all the time, chances are pretty
good
that your issue has been fixed with the latest software. Please give it a shot.
(Linux kernel 3.10.7, xf86-video-nouveau 1.0.9, mesa 9.1.6, or their git
versions.) If upgrading to the latest isn't an option for you, your
distro's
bugzilla is probably the right destination for your bug report.

In an effort to clean up our bug list, we're pre-emptively closing all bugs
that haven't seen updates since 2011. If the original issue remains, please
make sure to provide fresh info, see http://nouveau.freedesktop.org/wiki/Bugs/
for what we need to see, and re-open this one.

Thanks,

The Nouveau Team

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