Dual monitor detected but second display is simply black

[Ido Amiram]

Hi,

this problem is probably not related to tigervnc, but I figured you guys might have a clue.

so I have a server running tigervncserver, and that server does not have any physical monitor connected to it at all.

I can sucessfully login to that server with tigervncviewer, and everything works perfect.

however, the client has two monitors which I would like to use in my vnc session.

setting the dual monitor options in tigervncviewer will still show just one screen perfectly, but the second monitor is completely black.

xrandr shows two monitors, VNC-0 and VNC-1

thats why I assume maybe tigervnc has nothing to do with that. maybe it is my linux configuration?

anybody has a clue?

Thanks

[Ido Amiram]

P.S - I suspect that the two displays are actually rendered on top each other on the same physical display, does that make any sense?

ב-יום שלישי, 4 ביוני 2024 בשעה 10:06:17 UTC+3, ‪Ido Amiram‬‏ כתב/ה:

[Pierre Ossman]

On 04/06/2024 09:06, Ido Amiram wrote:
> I can sucessfully login to that server with tigervncviewer, and everything
> works perfect.
> however, the client has two monitors which I would like to use in my vnc
> session.
> setting the dual monitor options in tigervncviewer will still show just one
> screen perfectly, but the second monitor is completely black.
>

Might the client be a mac? If so, then it's a known limitation where
applications cannot span multiple monitors by default on macOS. If you
change the system setting "Displays have separate Spaces" then things
should work better.

Regards,
--
Pierre Ossman Software Development
Cendio AB http://cendio.com
Teknikringen 8 http://twitter.com/ThinLinc
583 30 Linköping http://facebook.com/ThinLinc
Phone: +46-13-214600

A: Because it messes up the order in which people normally read text.
Q: Why is top-posting such a bad thing?

[Ido Amiram]

One of the clients was a mac and it had that setting enabled

the other client I tried was a windows but no luck there as well

is there a way to turn on debug information to let me see if tigervnc is aware of the second screen?