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

[bugzilla-daemon at freedesktop.org]

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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