Nouveau - Dec 2012 - [Bug 58735] New: GeForce 680, HDMI output no good after passing through HDMI-to-DVI converter

https://bugs.freedesktop.org/show_bug.cgi?id=58735

          Priority: medium
            Bug ID: 58735
          Assignee: nouveau at lists.freedesktop.org
           Summary: GeForce 680, HDMI output no good after passing through
                    HDMI-to-DVI converter
        QA Contact: xorg-team at lists.x.org
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: quantheory at gmail.com
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: git
         Component: Driver/nouveau
           Product: xorg

Created attachment 72095
  --> https://bugs.freedesktop.org/attachment.cgi?id=72095&action=edit
xrandr output

I think this is an interesting one.

I run Gentoo with the hardened patches. Noticing that the git version of
nouveau had finally turned on acceleration for my card by default, I got kernel
3.7 (Gentoo hardened), and manually used a git patch to pull in the most recent
version yesterday (commit 73e5cf2d9af6bb32b91f8a2f6d7c44c8e9b4e785, as of now
still HEAD).

To my delight (and, I'll admit, mild surprise), everything seemed to work
fine
right away, at least as far as 2D acceleration and basic desktop stuff went. I
had two monitors plugged in, both with DVI cards, all very well and good.

I tried plugging in a third monitor today, using an HDMI cable with a
HDMI-to-DVI converter at the end (the monitor has no HDMI input), and I got a
floating blue message across the monitor saying "Input Not Supported".
Obviously a monitor message, not from the computer, which shows that the
monitor recognizes that it's getting something, but doesn't understand
what.
The monitor's auto-detect does recognize when I plug the thing in.

xrandr shows the monitor, as well as some graphical equivalents (e.g. the GNOME
3 "Displays" screen). This output is also perfectly correct and
equivalent to
the other identical monitors. I can drag windows to (and off of) that part of
the screen, and in all respects the computer seems to be blissfully unaware of
the monitor not working.

I can attach a kernel log, but I think it would be much better if I reboot in a
kernel without USB_DEBUG on, first. The spam makes it enormous, and I only had
it on to troubleshoot a different device that now works.

Oh, also:

- This setup works with the proprietary nVidia driver.

- This setup works with Windows 7 and nVidia's driver.

- I have no devices at hand to test if the HDMI video output works without the
DVI converter, so my belief that this is an issue with that conversion is just
a hunch.

- It might be that this is just an issue with the early/primitive support for a
relatively new card, but there are older, similar bugs, maybe duplicates:

Bug 17187
Bug 43939

- Also, a bug with HDMI that was never resolved (it seems):

Bug 56601


I'm going to hack around looking at this myself some more, but any input on
things to look at would be appreciated.

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--- Comment #1 from Sean Santos <quantheory at gmail.com> ---
Oops. Some errata:

- When I said "DVI cards", I meant "DVI cords". The card has
two DVI, an HDMI,
and a DisplayPort output. The DVI monitors seem OK, the HDMI with the converter
is not working (all monitors are identical and only have DVI in).

- The first bug should have been Bug 17185.

- I doubt it's relevant, but I may as well mention that the only thing in
xorg.conf is a section about my keyboard. I do multihead entirely using Randr
and have not used the proprietary driver since the last time I wiped the disk
on this box (but it worked before that).

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--- Comment #2 from Sean Santos <quantheory at gmail.com> ---
Ah, noticed on reboot that this is visible even on the console. When booting, I
get the flicker and resolution increase from nouveau, then the second monitor
starts working, but the third starts getting the "Input Not Supported"
message
before X even starts.

Attaching dmesg.

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--- Comment #3 from Sean Santos <quantheory at gmail.com> ---
Created attachment 72097
  --> https://bugs.freedesktop.org/attachment.cgi?id=72097&action=edit
Output of "dmesg >dmesg.log"

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Sean Santos <quantheory at gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|GeForce 680, HDMI output no |GeForce 680, currently
                   |good after passing through  |driver works on two, but
                   |HDMI-to-DVI converter       |not three monitors

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--- Comment #4 from Sean Santos <quantheory at gmail.com> ---
Well, turns out that my guesses about the problem were totally wrong. The
monitor works fine with the HDMI to DVI conversion, as long as there's no
more
than one other monitor present. If I have *both* DVI monitors plugged in, the
HDMI monitor is confused. So this seems to be a problem with a setup with >2
monitors.

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--- Comment #5 from Aleksi Torhamo <alexerion at gmail.com> ---
I can confirm this. Tested with the latest nouveau kernel (commit
73e5cf2d9af6bb32b91f8a2f6d7c44c8e9b4e785) and a GeForce GTX 660 (nve6). All
three screens worked with nouveau on kernel 3.6.11, but on this one, one stays
blank.

If I disable one of the outputs that work by default, the one that didn't
work
comes to life instead:

  Section "Device"
    ...
    Option "monitor-OUTPUT" "MonitorX"
  EndSection

  Section "Monitor"
    Identifier "MonitorX"
    Option "Ignore" "true"
  EndSection

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--- Comment #6 from Sean Santos <quantheory at gmail.com> ---
I played around with xrandr and found that this is an issue with CRTC 2 and 3.

With two monitors:
> xrandr --output DVI-I-1 --auto --crtc 2
[ No good. Monitor says "Input Not Supported".]
> xrandr --output DVI-I-1 --auto --crtc 3
[ No good. Monitor says "Input Not Supported".]
> xrandr --output DVI-I-1 --auto --crtc 1
[ Works fine. ]

Of course, with three monitors, one will always have one of the values that
doesn't work.

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--- Comment #7 from Aleksi Torhamo <alexerion at gmail.com> ---
Created attachment 72277
  --> https://bugs.freedesktop.org/attachment.cgi?id=72277&action=edit
patch to fix the regression

I bisected yesterday and found that the regression was introduced in commit
70790f4f. Patch attached.

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--- Comment #8 from Sean Santos <quantheory at gmail.com> ---
Nice! Works for me.

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Aleksi Torhamo <aleksi at torhamo.net> changed:

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

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Florian Mickler <florian at mickler.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |florian at mickler.org

--- Comment #9 from Florian Mickler <florian at mickler.org> ---
A patch referencing this bug report has been merged in Linux v3.8-rc4:

commit d19528a9e4f220519c2cb3f56ef0c84ead3ee440
Author: Aleksi Torhamo <aleksi at torhamo.net>
Date:   Fri Jan 4 18:39:13 2013 +0200

    drm/nouveau/clock: fix support for more than 2 monitors on nve0

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