[Nouveau] [Bug 60680] [NV96] HDMI is connected and has mode, TV says "no signal"

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=60680

--- Comment #9 from Pekka Paalanen <ppaalanen at gmail.com> ---
As preparing for bisection, here are new confirmed data points:

- 3.5.2 vanilla kernel (i.e. not Gentoo-patches) works.
- 3.11-rc6 vanilla kernel does not work.

I am specifically looking at whether boot-time fbcon after nouveau loads shows
up on HDMI, whether X by default shows up on HDMI, and can I get the HDMI
output exclusively.

On 3.5.2, fbcon is cloned, X by default is cloned, and HDMI exclusive works.

On 3.11-rc6, fbcon shows only on LVDS, X by default shows only on LVDS, and
HDMI exclusive does not show up anywhere. (off-topic: default resolution was
not native for LVDS anymore.)

The HDMI exclusive is set up by:
$ xrandr --output LVDS-1 --off --output HDMI-1 --mode 1920x1080 --set 'scaling
mode' 'None'

I did also try dual setup:
$ xrandr --output LVDS-1 --auto --output HDMI-1 --mode 1920x1080 --set 'scaling
mode' 'None' --right-of LVDS-1
but that does not work even on 3.5.2, LVDS works but TV says no signal.
Apparently something in manual dual-screen setup gets messed up, while boot-up
dual screen works. But that is off-topic here.

Therefore, my bisection will concentrate on whether HDMI exclusive at full-HD
resolution works or not.

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