[Arm-dev] CentOS 7 KDE on Pi 3B+ video issue - strange

[Sayduzzaman Mohammad]

Dear Ken,

I have gone through this situation several times, most of the cases i found
the image is faulty (bit missing / burning error / SD card issue).  I
always like to have couple of extra adapter. In any urgent case they prove
themselves worthless.

On Sat, Mar 16, 2019 at 7:22 PM Pablo Sebastián Greco <
pablo at fliagreco.com.ar> wrote:

>
> El 15/3/19 a las 20:52, Gordan Bobic escribió:
> > Most of these adapters have various compatibility issues. I went
> > through about 4 before I found one that allowed my laptop to talk to
> > the monitor I wanted to attach to it. Some of the adapters worked on
> > one machine, but not on others, going to the same monitor. I don't
> > know what causes these sorts of compatibility issues but it's not
> > specific to the Pi, it happens all over the place on all sorts of
> > devices, both high end and low end.
> As Gordan said, compatibility will always be an issue, but if you want
> to continue playing with it, I'd start replacing the bootfiles (and
> maybe playing with config.txt, cmdline.txt)
> >
> >
> > On Fri, Mar 15, 2019 at 11:10 PM kht-lists <kht-lists at protonmail.ch
> > <mailto:kht-lists at protonmail.ch>> wrote:
> >
> >     I downloaded the referenced image a couple of days ago, burned it
> >     to a 16 GB SD card and booted my Pi 3B+. Fantastic! The Pi was
> >     connected with a HDMI to DVI cable to a Dell 19" monitor.
> >
> >     I received in the mail a couple of HDMI to VGA adapters. The $4
> >     generic ones which are all over ebay.  I have several which I have
> >     purchased over the years and the generally work fine.
> >     adapter.png
> >
> >     I decided to test the new adapters with the Pi.  I connected one
> >     to the Pi and to a VGA cable to the same monitor (which has two
> >     inputs). I had NO video. No rainbow screen, no 4 raspberries
> >     screen, not test.  Same for the second adapter.  I tested the
> >     adapters on an Intel based PC. They worked fine.  But it gets
> >     stranger... I booted the same Pi, same new adapter, connected to
> >     the same monitor from an Ubuntu SD card. The video was fine!   And
> >     stranger still... I tried 3 older adapters with the Pi, CentOS and
> >     the same cable and monitor. The video was again fine!
> >
> >     These adapters have no manufacturer markings. They probably all
> >     came from the same factory in China. Obviously something changed
> >     in the devices and I do not expect to ever be able to figure that
> >     out. However, something is also different in the video (driver I
> >     guess?) signal from the Pi with CentOS vs. Ubuntu.  Can someone
> >     shed any light on this mystery?
> >
> >     TIA,
> >
> >     Ken
> >
> >
> >
> >     Sent with ProtonMail <https://protonmail.com> Secure Email.
> >
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> >
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