Re: [gentoo-user] Changed monitor and even the BIOS screen doesn't show up.

Dale <rdalek1967@×××××.com> [10-12-14 05:28]:
> meino.cramer@×××.de wrote:
> >Dale<rdalek1967@×××××.com>  [10-12-14 05:04]:
> >
> >>Hi,
> >>
> >>I am in the process of switching from the old rig to the new rig.
> >>While doing the install I was using a Gateway EV700 monitor and it
> >>worked fine.  I unhooked the cables from my old rig and moved in the
> >>new rig.  The new monitor is a Gateway EV910.  When I boot with the
> >>Gateway EV910 hooked up, it doesn't even come out of power saver mode
> >>or show the BIOS screen that pops up when I first turn the puter on.
> >>It does work with the one I used to install with, EV700.  So, I know
> >>the card didn't mess up in the switch.
> >>
> >>Since it doesn't even work with the BIOS screen, this is not a OS
> >>issue.  Is there some setting I have to change to be able to change
> >>monitors or am I just going nuts here?  What is it about hooking up a
> >>different monitor that makes it not work?   Both monitors support the
> >>same resolutions and I have switched these before with my old rig and
> >>not a single problem.
> >>
> >>What am I missing?  Some new feature that the video card remembers
> >>what
> >>monitor it is supposed to hook up to?
> >>
> >>Thoughts?  Fixes would be nice.
> >>
> >>Dale
> >>
> >>:-)  :-)
> >>
> >>
> >Hi Dale,
> >
> >just a shot in the dark (I did the same a few weeks ago):
> >
> >May the non-working monitor has more than one input jack, say
> >HDMI, DVI and analog.
> >
> >May be the monitor is set to await  a signal at the HDMI input
> >and physically the signal is feed into the DVI input ?
> >
> >HTH!
> >
> >Best regards,
> >mcc
> >
> >
>
> This is a older monitor.  It only has the DB-15 connector and the power
> cord of course.  This is funny tho.  I booted the new puter with the
> EV700 monitor hooked up.  I logged into KDE and once it was running, I
> cut off the power to the old monitor and unhooked the cable from the
> puter.  I then hooked up the EV910 monitor and cut on its power.  It
> works.  Thing is, if I reboot, it does the same thing again.  No BIOS
> screen or anything.  Weird huh?
>
> I may cut everything off, remove the video card from the system and see
> if there is a button or battery on it.  Maybe that will do something,
> reset if nothing else.   For those keeping up, even the BIOS screen
> doesn't show up so this is not Gentoo, grub or anything.  It's just
> weird.
>
> Open to other ideas tho.  This is the weirdest thing I have seen in a
> while.
>
> Dale
>
> :-)  :-)
>

Next shot in the dark:
Some monitors can be asked to offer their physical data like
resolution and such. It is called EDID or something like that.

May be the BIOS (or the graka) tries to ask the monitor about its EDID
data and the return is "The sound of Silence" ... or something more
weird and misunderstandable...

And the graka hangs and therefore the BIOS waits forever for the graka
and Dale waits forever for monitor... ;)

When booted with a "talking and correctly speaking EDID" monitor the
garak is setup correctly and everything is fine.

If you are using a nvidia-card use the nvidia-settings tool when
haveing switched the monitors the "bad way" ;) and in the nvidia
settings tool you will find the possibility to "Acquire EDID" (a
button). Do this with the new monitor to check whether it talks EDID
correctly.

Two things I would try to fix the problem:
Boot into the BIOS and check, whether "First VGA" (this is how it is
called in my BIOS) is set to the correct bus type/card. In my case it 
has to be set to PCIe.
Any may be you will also find a setting to instruct the card to
acquire EDID data from the monitor. Toggle this.

HTH!
Best regards,
mcc