Nouveau - Apr 2008 - [Bug 15350] New: randr12: VGA-0 always reported as "disconnected"

http://bugs.freedesktop.org/show_bug.cgi?id=15350

           Summary: randr12: VGA-0 always reported as "disconnected"
           Product: xorg
           Version: git
          Platform: Other
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/nouveau
        AssignedTo: nouveau at lists.freedesktop.org
        ReportedBy: jorton at redhat.com
         QAContact: xorg-team at lists.x.org


Created an attachment (id=15678)
 --> (http://bugs.freedesktop.org/attachment.cgi?id=15678)
xorg.conf

I'm using nouveau from git with Fedora Raw Hide-ish Xorg, on a laptop with:

00:05.0 VGA compatible controller: nVidia Corporation C51 [Geforce 6150 Go]
(rev a2)

the LVDS works fine, but I can't get the VGA output to work.  xrandr -q
always
reports "VGA-0 disconnected".


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--- Comment #1 from Joe Orton <jorton at redhat.com>  2008-04-04 08:30:28
PST ---
Created an attachment (id=15679)
 --> (http://bugs.freedesktop.org/attachment.cgi?id=15679)
Xorg.0.log


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--- Comment #2 from Joe Orton <jorton at redhat.com>  2008-04-04 08:31:31
PST ---
Created an attachment (id=15680)
 --> (http://bugs.freedesktop.org/attachment.cgi?id=15680)
xrandr -q output


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--- Comment #3 from Joe Orton <jorton at redhat.com>  2008-04-04 08:32:37
PST ---
I added the:

        Option "Monitor-LVDS" "Laptop LCD"
        Option "Monitor-VGA-0" "External VGA"

& associated Monitor sections to xorg.conf in an attempt to force detection
of
the VGA output, but it didn't make any difference.


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--- Comment #4 from Maarten Maathuis <madman2003 at gmail.com>  2008-04-04
08:39:49 PST ---
Is your monitor DDC capable?


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--- Comment #5 from Joe Orton <jorton at redhat.com>  2008-04-04 09:05:37
PST ---
Yes, I've tried with two separate LCD panels.


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Stuart Bennett <sb476 at cam.ac.uk> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |sb476 at cam.ac.uk




--- Comment #6 from Stuart Bennett <sb476 at cam.ac.uk>  2008-04-04
13:31:10 PST ---
If you bludgeon the ext vga into connectedness (say, by adding "return
XF86OutputStatusConnected;" at the top of nv_analog_output_detect in
nv_output.c), any joy? If not, a log of attempting that would be good.


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--- Comment #7 from Joe Orton <jorton at redhat.com>  2008-04-04 14:10:06
PST ---
Earlier I tried changing that very function to return XF86OutputStatusUnknown
in the fall-through case rather than Disconnected; would you expect that to
have a similar effect?

It seemed a little better; the monitor displayed a blank screen rather than
screaming "omg no input"; it didn't fetch the EDID info though.  I
added
debugging printfs to nv_get_edid to see where it was falling out, and it was:

        ddc_mon = xf86OutputGetEDID(output, nv_output->pDDCBus);
        if (!ddc_mon) {

returning ddc_mon == NULL here.  I'm off to a conference for all of next
week
so may not be able to play with this any more for a while.  Suggestions on how
to debug further (or to tell me I'm simply screwing up the config!) welcome.


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--- Comment #8 from Stuart Bennett <sb476 at cam.ac.uk>  2008-04-04
14:38:11 PST ---
Last time I lookked, "Unknown" outputs were only used if nothing could
be found
as definitely connected -- since the LVDS *is* connected, you lose. Saying it
is definitely connected should make the xserver use its pool of default modes.

I'm not too worried yet about the lack of ddc, as I strongly suspect (having
looked at a C51 bios image) that the integrated chipset uses a different set of
regs to read/write I2C, hence ddc is broken. Before fixing that though, I'd
like to be convinced that using the xserver's fallback default modes we can
get
the screen lit up without additional trickery being required.


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--- Comment #9 from Stuart Bennett <sb476 at cam.ac.uk>  2008-04-26
17:15:48 PST ---
Hi, any luck with trying to force a connected status as described in comment 6?


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--- Comment #10 from Joe Orton <jorton at redhat.com>  2008-04-29 06:02:29
PST ---
Created an attachment (id=16235)
 --> (http://bugs.freedesktop.org/attachment.cgi?id=16235)
new Xorg log


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--- Comment #11 from Joe Orton <jorton at redhat.com>  2008-04-29 06:03:33
PST ---
Created an attachment (id=16236)
 --> (http://bugs.freedesktop.org/attachment.cgi?id=16236)
debugging diff


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--- Comment #12 from Joe Orton <jorton at redhat.com>  2008-04-29 06:07:06
PST ---
Sorry about the delay.

I've attached the diff I'm using, and the log which results, same config
as
above.  The results are the same: nothing is displayed on the monitor, but the
monitor is not screaming "no input" any more.  (and e.g. after forcing
a mode
change with xrandr, the monitor flicked up "Auto adjust" but then
carried on
displaying nothing)


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Joe Orton <jorton at redhat.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
  Attachment #16235|text/x-log                  |text/plain
          mime type|                            |




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--- Comment #13 from Stuart Bennett <sb476 at cam.ac.uk>  2008-04-29
06:43:29 PST ---
I'm beginning to suspect that something in your xorg conf is working against
you; your initial log claims no modes exist for VGA-0, and your new log manages
to find a 1360x768 mode, which is quite special. Maybe try without the
additional Monitor sections, and/or add something like

Modes           "1024x768" "800x600" "640x480"

inside the Display subsection of your Screen section. Bug 15729 (same chipset
as this bug) manages to use the load detection stuff correctly (although it
obviously only uses a pool of generic modes), so that ought to work here too.

That said, there's now a C51 DDC patch in the same bug which will hopefully
fix
your DDC too.


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--- Comment #14 from Joe Orton <jorton at redhat.com>  2008-05-01 08:12:08
PST ---
Created an attachment (id=16300)
 --> (http://bugs.freedesktop.org/attachment.cgi?id=16300)
current config


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--- Comment #15 from Joe Orton <jorton at redhat.com>  2008-05-01 08:12:46
PST ---
Created an attachment (id=16301)
 --> (http://bugs.freedesktop.org/attachment.cgi?id=16301)
current log


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--- Comment #16 from Joe Orton <jorton at redhat.com>  2008-05-01 08:19:33
PST ---
I've applied the patch from Bug 15729 and this seems to be getting the DDC
info
correctly from the (Dell) panel - nice work! It's also not falling through
to
the debugging force-connected hack any more.

I'm still not getting any output on the VGA head, though.

Attached current config/log.

(I've no idea why it likes 1360x768.  One of the three panels I have ever
tried
testing with uses that as a native resolution; the only one not currently in
the same room as the laptop!)


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--- Comment #17 from Stuart Bennett <sb476 at cam.ac.uk>  2008-05-01
11:16:46 PST ---
Looking over your log, it seems you're using a checkout of the nouveau ddx
that's around a month old. In the intervening period there have been several
commits which could affect issues of this sort, so it's worth doing future
testing against the code in git (the git code also has the C51 DDC patch
applied).

Please also test with   Option "ModeDebug" "On"   in the
Device section of your
xorg.conf to generate a more verbose log, and when in X, see if setting some
different modes helps: run xrandr to see a list of available resolutions for
VGA-0, then set one using xrandr --output VGA-0 --mode 800x600 (for an 800x600
mode).


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--- Comment #18 from Pekka Paalanen <pq at iki.fi>  2009-08-09 00:45:01
PST ---
Joe, any news on this issue?


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--- Comment #19 from Joe Orton <jorton at redhat.com>  2009-08-09 01:36:08
PST ---
Sorry, the laptop on which I saw this bug joined the bit bucket in the sky a
while back.  Feel free to close out if you think appropriate.


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Pekka Paalanen <pq at iki.fi> changed:

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




--- Comment #20 from Pekka Paalanen <pq at iki.fi>  2009-08-09 01:44:06
PST ---
Okay, thanks. Closing.


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