Re: No HDMI output on AC100

[Thomas Meyer <thomas-VsYtu1Qij5c@public.gmane.org>]

Am Samstag, den 15.06.2013, 11:43 +0200 schrieb Thierry Reding:
> 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-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>:
> > > [...]
> > > > > 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).

sorry, I wasn't able to get the infos. xrandr refused to connect to the
X server spawned by lightdm but I don't know why. Maybe some missing
Xauthority or something like that.

But I got these infos, after a fresh boot:

$ fbset -i

mode "1920x1080"
    geometry 1920 1080 1920 1080 32
    timings 0 0 0 0 0 0 0
    accel true
    rgba 8/16,8/8,8/0,0/0
endmode

Frame buffer device information:
    Name        : 
    Address     : 0x1a100000
    Size        : 8294400
    Type        : PACKED PIXELS
    Visual      : TRUECOLOR
    XPanStep    : 1
    YPanStep    : 1
    YWrapStep   : 0
    LineLength  : 7680
    Accelerator : No

$ fbset -i -fb /dev/fb1

mode "1024x768"
    geometry 1024 768 1024 768 16
    timings 0 0 0 0 0 0 0
    accel true
    rgba 5/11,6/5,5/0,0/0
endmode

Frame buffer device information:
    Name        : udldrmfb
    Address     : 0xe0dbc000
    Size        : 1572864
    Type        : PACKED PIXELS
    Visual      : TRUECOLOR
    XPanStep    : 1
    YPanStep    : 1
    YWrapStep   : 0
    LineLength  : 2048
    Accelerator : No

When I add the boot option "video=HDMI-A-1:1680x1050" I get a working fb
console even while booting up. Later on I can start X manually and then
X switches to 1920x1080 and everything works okay.

> 
> Thierry