[PLUG] HDMI

[Johnathan Mantey]

Have you tried redirecting the output signal prior to HDMI cable insertion?

For my version of Ubuntu if I press "Window-p" I get a menu of possible
output targets.
Prior to inserting the cable make sure the output is "laptop screen only".
Insert the cable, and then try "duplicating" the screen, so that if it
fails you still have a UI to return to laptop screen only.
If all of that works, then try to be more adventurous.

On Mon, Jul 20, 2020 at 7:27 PM Ben Koenig <techkoenig at gmail.com> wrote:

>
> On 7/20/20 7:03 PM, Bruce Kilpatrick wrote:
> > On 7/20/20 7:01 PM, Bill Barry wrote:
> >> On Mon, Jul 20, 2020, 8:48 PM Bruce Kilpatrick <kd7vvk at gmail.com>
> wrote:
> >>
> >>> On 7/20/20 6:47 PM, Bill Barry wrote:
> >>>> On Mon, Jul 20, 2020, 8:42 PM Bruce Kilpatrick <kd7vvk at gmail.com>
> >>>> wrote:
> >>>>
> >>>>> On 7/20/20 6:23 PM, Nat Taylor wrote:
> >>>>>> Boot into safe mode or single user mode, so you get a command
> >>>>>> prompt.
> >>>>> Then
> >>>>>> you could try checking your dmesg / syslog etc, and maybe
> >>>>>> uninstalling
> >>>>> any
> >>>>>> nvidia drivers?
> >>>>>>
> >>>>>> On Mon, Jul 20, 2020 at 8:05 AM Bruce <kd7vvk at gmail.com> wrote:
> >>>>>>
> >>>>>>>
> >>>>>>> On 7/20/20 12:00 AM, John Jason Jordan wrote:
> >>>>>>>> On Sun, 19 Jul 2020 21:22:49 -0700
> >>>>>>>> Bruce <kd7vvk at gmail.com> dijo:
> >>>>>>>>
> >>>>>>>>> My Google searches turn up lots of problems with Nvidia.  This
> >>> laptop
> >>>>>>>>> has onboard Intel drivers.
> >>>>>>>>>
> >>>>>>>>> Can anybody point me in the proper direction?
> >>>>>>>> The command lshw -c video will tell you which chip it is trying to
> >>> use.
> >>>>>>>> There are lots of problems with the nouveau driver, especially
> >>>>>>>> with
> >>>>>>>> older Nvidia chips.
> >>>>>>>> _______________________________________________
> >>>>>>>> PLUG mailing list
> >>>>>>>> PLUG at pdxlinux.org
> >>>>>>>> http://lists.pdxlinux.org/mailman/listinfo/plug
> >>>>>>>
> >>>>>>> This laptop is running an Intel chipset.  The driver is i915.
> >>>>>>>
> >>>>>>> It's strange that things work during boot showing the Ubuntu
> >>>>>>> logo then
> >>>>>>> just stops around the time the desktop should appear
> >>>>>>>
> >>>>>>> _______________________________________________
> >>>>>>> PLUG mailing list
> >>>>>>> PLUG at pdxlinux.org
> >>>>>>> http://lists.pdxlinux.org/mailman/listinfo/plug
> >>>>>>>
> >>>>>> _______________________________________________
> >>>>>> PLUG mailing list
> >>>>>> PLUG at pdxlinux.org
> >>>>>> http://lists.pdxlinux.org/mailman/listinfo/plug
> >>>>>>
> >>>>> I have perused the lists as I can boot and run without the HDMI
> >>>>> cable.
> >>>>> Nothing stood out.  I'll have to peek at it in a bit to see if it has
> >>>>> any Nvidia drivers. The laptop is all Intel chipset, but it's worth a
> >>> look
> >>>>>
> >>>>
> >>>>
> >>>> Well does it work if you boot without the HDMI cable, then plug it in
> >>> after
> >>>> it boots?
> >>>>
> >>>> Bill
> >>>>
> >>>>> _______________________________________________
> >>>>> PLUG mailing list
> >>>>> PLUG at pdxlinux.org
> >>>>> http://lists.pdxlinux.org/mailman/listinfo/plug
> >>>>>
> >>>> _______________________________________________
> >>>> PLUG mailing list
> >>>> PLUG at pdxlinux.org
> >>>> http://lists.pdxlinux.org/mailman/listinfo/plug
> >>>>
> >>> That sends the screen on the laptop to a blank (possibly flashing) and
> >>> the TV saying it has no incoming signal
> >>>
> >>
> >>
> >> Looks like the same bug being reported here.
> >> https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1871721
> >> They are attributing it to problems with Nvidia drivers as you would,
> >> but
> >> it might be a more general problem. I don't see any  solution in the
> >> thread, but a few had luck just turning the power on and off on the
> >> external monitor.
> >>
> >> Bill
> >>
> >> _______________________________________________
> >>> PLUG mailing list
> >>> PLUG at pdxlinux.org
> >>> http://lists.pdxlinux.org/mailman/listinfo/plug
> >>>
> >> _______________________________________________
> >> PLUG mailing list
> >> PLUG at pdxlinux.org
> >> http://lists.pdxlinux.org/mailman/listinfo/plug
> >>
> > Hadn't thought of that...on my way downstairs
>
>
> It's worth noting that HDMI issues on dual-GPU laptops on linux are
> common and not necessarily relevant to single GPU problems. It has to do
> with problems handing off control of the display from one GPU to another.
>
>
> You've confirmed that your laptop only has the single GPU but your
> symptoms are similar so SEO starts running amok when you run searches.
> Could be going down the wrong rabbit hole so taking everything with a
> grain of salt is a good idea.
>
>
>
> > _______________________________________________
> > PLUG mailing list
> > PLUG at pdxlinux.org
> > http://lists.pdxlinux.org/mailman/listinfo/plug
> _______________________________________________
> PLUG mailing list
> PLUG at pdxlinux.org
> http://lists.pdxlinux.org/mailman/listinfo/plug
>