Re: No HDMI output on AC100

[Thierry Reding <thierry.reding-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>]

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On Sat, Jun 15, 2013 at 11:37:46AM +0200, Thomas Meyer wrote:
> Am Freitag, den 14.06.2013, 23:26 +0200 schrieb Thierry Reding:
> > On Fri, Jun 14, 2013 at 10:59:00PM +0200, Thomas Meyer wrote:
> > > Am 14.06.2013 um 22:37 schrieb Thierry Reding <thierry.reding@gmail.com>:
> > [...]
> > > > I think I've seen a similar issue
> > > > when that's not loaded, in which case DRM will turn off all outputs
> > > > because there's nothing to display. Alternatively you could try to run
> > > > an X server using the xf86-video-opentegra or xf86-video-modesetting
> > > > drivers. That should definitely get you output on HDMI.
> > > 
> > > I did login blindly on tty2 and started xfce using the open tegra driver,
> > > but still no hdmi output. I can send you the Xorg log file if you want
> > > to.
> > 
> > Yes, Xorg output would be good. Additionally, dmesg output might help.
> > Don't forget to pass drm.debug=0xf on the kernel command-line.
> > 
> > > Xfce seems to run correctly, as far as I can see all necessary processes
> > > are running. The monitor I connect to the hdmi is an dvi monitor using
> > > an dvi to hdmi adapter, so no sound is connected. But that shouldn't be
> > > a problem.
> 
> btw. switching the mode with
> $ xrandr  -d :0 --output HDMI-0 --mode 1680x1050
> 
> makes the external monitor output the display correctly...
> 
> also switching to the highest possible resolution works after the first
> mode switch:
> $ xrandr  -d :0 --output HDMI-0 --mode 1920x1080

So perhaps the default configuration chosen at startup isn't one that
tegra-drm can properly deal with. Can you provide the output of

	$ xrandr --query

run immediately after booting (that is with the default configuration
before you make it work by setting a 1680x1050 mode).

Thierry

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