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Re: Intermittent blank screen – Stretch




On Sunday 03 June 2018 07:54:22 Mike wrote:

> On 02/06/18 08:11, floris wrote:
> > Mike schreef op 2018-06-01 01:27:
> >> I have just installed Stretch and and randomly getting a 2 second
> >> (or so) blank screen. I can go for quite some time without it
> >> happening, or it can happen several times over a few minutes. I can
> >> dual boot with Jessie and do not have the problem with that – so I
> >> think I can rule out a hardware issue.
> >>
> >> I have an Nvidia GTX1050 video card, HDMI output to a Samsung 49"
> >> TV, 4K video. There is no other type of input into the TV for me to
> >> be able to test.
> >>
> >> Here is what I have done
> >> 1. Installed Stretch (amd64) with XFCE
> >> 2. apt-get install firmware-linux nvidia-driver nvidia-settings
> >> nvidia-xconfig
> >> 3. run nvidia-xconfig
> >> 4. turned off screen blanking in power settings
> >>
> >> I am quite happy to spend time troubleshooting, but don’t really
> >> know where to start. The blanking happens too quickly for me to be
> >> able to do anything at the time.
> >>
> >> Does anyone have any thoughts?
> >>
> >> Thanks
> >>
> >> Mike
> >
> > You can try the NVidia driver module from backports [1] and/or run
> > journalctl -f in a terminal and wait for the blank screen.
> >
> > [1] https://packages.debian.org/stretch-backports/nvidia-driver
> > ---
> > Floris
>
> Okay, now here is a weird thing.
>
> I just unplugged a USB cable that was, in turn, connected to a
> microcontroller. My screen went blank. When I plugged in back in it
> went blank again. This happened about 4 times until I could plug and
> unplug without the blanking. I left it for 30-odd seconds and was able
> to do the same thing. It did not happen when I unplugged my computer
> keyboard, or my USB camera.
>
> Does this give anyone any ideas?

Yes.  Unplug it again, and install htop, the run it as root so the kill 
button, F9 can kill any thing. Plug the cable to the micro-controller 
back in and see what pops up in the top 10 or so when htop is set to 
watch cpu. My theory is that the micro-controller is spaming your main 
box with lots of traffic.  But its just a theory.

> Thanks.
>
> Mike



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