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Re: Missing HDMI display




On Wed, 2017-08-02 at 01:48 -0400, Felix Miata wrote:
> Michael Milliman composed on 2017-08-01 21:22 (UTC-0500):
> 
> > With a little more research, I have found that the HDMI interface
> > is
> > detected and shows up on the xrandr output.  However, it shows up
> > as
> > being disconnected, even though it is indeed connected.  I note
> > that I
> > have checked both the cable and the the connector on the monitor
> > (HDTV
> > in this case) and they both are good -- both windows on the same
> > laptop, and the HDMI outputs of two different Android tablets work
> > with
> > the TV on their HDMI ports using the same cable and input on the
> > TV.
> > I have done a little additional research on the web, and found a
> > couple
> > of similar situations, but I have been unable to get xrandr to show
> > the
> > HDMI port as connected.
> 
> What does Xorg.0.log say? Share the whole thing via paste.debian.net
> (optionally
> pastebinit via cmdline).
Xorg.0.log does not exist on my system (this mystified me when I went
to look at it)
> 
> I suspect you're going to need specialized help due to some bug.
> Where to go I
> can't be sure, because nothing you've written makes it completely
> unambiguous
> whether the HDMI port is controlled by a proprietary NVidia driver or
> one of the
> FOSS drivers. https://support.hp.com/us-en/document/c05567143 doesn't
> seem to
> help either.
> 
In trying to determine what driver is being used, I found this in the
lspci -v -nn output:
    01:00.0 VGA compatible controller [0300]: NVIDIA Corporation Device
    [10de:1c8d] (rev ff) (prog-if ff)
    	    !!! Unknown header type 7f
    	    Kernel modules: nvidia
Clearly the !!! Unknown header type 7f is an indication of a problem.

    > If it's only NVidia showing up in the log, you probably need to goto
> NVidia's
> support forum. If Intel is showing up in the log, then I'd start with
> the
> intel-gfx@xxxxxxxxxxxxxxxxxxxxx mailing list so that Intel's driver
> devs can
> take a look. For the latter,
> https://01.org/linuxgraphics/documentation/how-report-bugs has rather
> explicit
> instructions to consider.
-- 
73s de Mike, WB5VQX