Nouveau - May 2015 - [Bug 90424] New: [NVAA] Xorg on HDMI regression since v4.0-rc1

https://bugs.freedesktop.org/show_bug.cgi?id=90424

            Bug ID: 90424
           Summary: [NVAA] Xorg on HDMI regression since v4.0-rc1
           Product: xorg
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/nouveau
          Assignee: nouveau at lists.freedesktop.org
          Reporter: alexanders83 at web.de
        QA Contact: xorg-team at lists.x.org

While trying to fix another bug I tried using kernel v4.0 and noticed that
after X.org has started (running fluxbox with mythtv in my case) the screen
stays black. My screen is attached on HDMI.
During boot I can see the console output just fine but when X started it stays
black. I don't even see the first small X shaped cursor.
I bisected this back to commit 0ea5fe8a83c2 ("drm/nouveau/kms: default to
panel
scaling, except for fixed panels prior to nv50").
>From the commit message I suspect that "panel scaling" (whatever
that means)
does not work on my NVAA. I check the values of nv_connector->type and
nv_connector->scaling_mode on both the bisected commit and the parent (last
commit working).
The type is 0x61 (DCB_CONNECTOR_HDMI_1) in both cases and the scaling_mode is 0
(DRM_MODE_SCALE_NONE) when the screen stays black while it is 1
(DRM_MODE_SCALE_FULLSCREEN) when everything works normally.
dmesg doesn't show anything interesting though. Maybe a higher log level,
please give me some hints which component and which debug level you may need.

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--- Comment #1 from Alexander Stein <alexanders83 at web.de> ---
Created attachment 115722
  --> https://bugs.freedesktop.org/attachment.cgi?id=115722&action=edit
xrandr --verbose from 3.19 kernel

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--- Comment #2 from Alexander Stein <alexanders83 at web.de> ---
Created attachment 115723
  --> https://bugs.freedesktop.org/attachment.cgi?id=115723&action=edit
xrandr --verbose from 4.0 kernel

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--- Comment #3 from Alexander Stein <alexanders83 at web.de> ---
Created attachment 115724
  --> https://bugs.freedesktop.org/attachment.cgi?id=115724&action=edit
Xorg log from 4.0 kernel

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Alexander Stein <alexanders83 at web.de> changed:

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

--- Comment #4 from Alexander Stein <alexanders83 at web.de> ---
Apparently this is due a custom modesetting I needed to use before attaching a
AV receiver. My TV required a custom modesetting with resolution 1360x768, but
this is not supported by the AV receiver. So when using the unsupported
resolution with panel scaling nothing is displayed.
In my case I could remove the custom modesetting as the AV receiver has a
proper EDID with 1920x1080 (which is scaled down by that box for the TV). If
someone needs a custom modesetting the old fullscreen scaling should be used,
e.g. 
xrandr --output HDMI-1 --prop 'scaling mode' 'Full'

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Alexander Stein <alexanders83 at web.de> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|[NVAA] Xorg on HDMI         |[NVAA] custom modesetting
                   |regression since v4.0-rc1   |regression since v4.0-rc1

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