[Ltsp-discuss] Fat client HDMI -> DVI no picture

[Rolf-Werner Eilert]

Additionally to the NUC, I now tried a Zotac. My monitor has only DVI.
For the NUC, I have used an adapter from HDMI to DVI, so I thought it
would work for the Zotac as well.

Bios screen runs, boot menu runs. But as soon as graphics is switched
on, the screen switches off.

Via epoptes, I can see the Zotac is up and running, waiting at the LDM
prompt.

Any idea where I should start searching?

Regards
Rolf

[Rolf-Werner Eilert]

Post by Rolf-Werner Eilert
Any idea where I should start searching?

Firs of all, check if your hardware hdmi->dvi works.. Does it shows BIOS
screen? And start Zortac from USB Live Linux and check video.
Adam

Yes, as I've written above, BIOS screen is shown, and boot menu is
shown, and the first few seconds of booting are shown. Only when
graphics is switched from text to graphics mode, the monitor says "no
signal" and goes to sleep mode. The client keeps booting until LDM and
seems not to be aware of a missing monitor.

The idea with a Live Linux is good, will try later.

Rolf

[Alkis Georgopoulos]

Post by Rolf-Werner Eilert
Yes, as I've written above, BIOS screen is shown, and boot menu is
shown, and the first few seconds of booting are shown. Only when
graphics is switched from text to graphics mode, the monitor says "no
signal" and goes to sleep mode. The client keeps booting until LDM and
seems not to be aware of a missing monitor.

From epoptes, right click on the client, and select execute > open
terminal > root, locally.

There, type:
xrandr
and paste the output here, and then:
xrandr -s 800x600
and see if the screen now shows any output.

Maybe the client sends a bigger resolution than adapter/screen support.
If so, just use `xrandr -s xxx` until you find the proper one, and
finally put it in an lts.conf XRANDR_MODE_0 directive.

[Rolf-Werner Eilert]

Post by Alkis Georgopoulos

Post by Rolf-Werner Eilert
Yes, as I've written above, BIOS screen is shown, and boot menu is
shown, and the first few seconds of booting are shown. Only when
graphics is switched from text to graphics mode, the monitor says "no
signal" and goes to sleep mode. The client keeps booting until LDM and
seems not to be aware of a missing monitor.

From epoptes, right click on the client, and select execute > open
terminal > root, locally.
xrandr
xrandr -s 800x600
and see if the screen now shows any output.
Maybe the client sends a bigger resolution than adapter/screen support.
If so, just use `xrandr -s xxx` until you find the proper one, and
finally put it in an lts.conf XRANDR_MODE_0 directive.

I tried this, xrandr says that all 3 graphics ports are disconnected,
somehow like this:

Screen0: minimum 320x200, current 1024x768, maximum...
DP-1 disconnected primary (...)
DP-2 disconnected (...)
HDMI-1 disconnected (...)

Then I tried to force it to somewhat like 1280x1024, it does confirm,
but still all ports remain disconnected.

Could I change this from BIOS? Or do I have another chance from lts.conf?

Regards
Rolf

[Rolf-Werner Eilert]

Post by Rolf-Werner Eilert
Yes, as I've written above, BIOS screen is shown, and boot menu is
shown, and the first few seconds of booting are shown. Only when
graphics is switched from text to graphics mode, the monitor says "no
signal" and goes to sleep mode. The client keeps booting until LDM and
seems not to be aware of a missing monitor.
The idea with a Live Linux is good, will try later.
Rolf

# Force all clients to a specific resolution.
#XRANDR_MODE_0=1024x768
That situation can be because of hdmi->dvi - I have the same situation,
laptop (VGA D-SUB) --> HDMI (by Sandberg) -- hdmi cable --> DVI (by
China connection)
When I connect just by VGA D-Sub cable, everything is correct.
Adam

Yes it seems to be something similar. But I cannot force it with
changing the resolution (see my answer to Alkis). It is a problem that
all ports stay disconnected.

On the NUC it runs flawlessly, but the NUC has a VGA and an HDMI port,
not DP and HDMI.

Regards
Rolf

[Eberhard Roloff]

Post by Rolf-Werner Eilert
[...]
Yes it seems to be something similar. But I cannot force it with
changing the resolution (see my answer to Alkis). It is a problem that
all ports stay disconnected.
On the NUC it runs flawlessly, but the NUC has a VGA and an HDMI port,
not DP and HDMI.
Regards
Rolf

Then, the next thing you try out,
might be a HDMI cable with an HDMI Screen (or DP - DPCable - DP screen,
just to keep things simple.

Kind regards
Eberhard

Post by Rolf-Werner Eilert
------------------------------------------------------------------------------
Check out the vibrant tech community on one of the world's most
engaging tech sites, Slashdot.org! http://sdm.link/slashdot
_____________________________________________________________________
https://lists.sourceforge.net/lists/listinfo/ltsp-discuss
For additional LTSP help, try #ltsp channel on irc.freenode.net

[Rolf-Werner Eilert]

Post by Eberhard Roloff

Post by Rolf-Werner Eilert
[...]
Yes it seems to be something similar. But I cannot force it with
changing the resolution (see my answer to Alkis). It is a problem that
all ports stay disconnected.
On the NUC it runs flawlessly, but the NUC has a VGA and an HDMI port,
not DP and HDMI.
Regards
Rolf

Then, the next thing you try out,
might be a HDMI cable with an HDMI Screen (or DP - DPCable - DP screen,
just to keep things simple.
Kind regards
Eberhard

Yes, that was my impression too. I only wonder why the combination runs
on the NUC, and not on the Zotac client and if it should be possible by
deactivating or changing some graphics option in Bios.

I would like to keep my monitor in the office to use it with the Zotac,
so buying a new monitor just for the Zotac would be somewhat unsatisfying.

There is one thing left, setting monitor resolution to exactly the
maximum the monitor offers, as I didn't have the time to try this
yesterday. But I will have to find some HDMI monitor for testing anyway.

Regards
Rolf