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https://issues.apache.org/jira/browse/GUACAMOLE-421?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16208980#comment-16208980
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Michael Jumper commented on GUACAMOLE-421:
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The "caching" feature of x11vnc (enabled by that {{-ncache 10}} option) is
implemented by creating a display with many times the actual display size,
using the extra space as a scratch area for copying data. What you're seeing is
not the result of Guacamole miscalculating the screen size; the VNC server
you're using is actually creating a display which is that large.
On a different note, beware that you are using a very old version of Guacamole.
Version 0.8.3 is from 2013. The latest release is 0.9.13-incubating.
> Client area not correctly detected (virtual desktops)
> -----------------------------------------------------
>
> Key: GUACAMOLE-421
> URL: https://issues.apache.org/jira/browse/GUACAMOLE-421
> Project: Guacamole
> Issue Type: Bug
> Reporter: Kees Jongenburger
> Attachments: Screenshot_20171018_101521.png,
> Screenshot_20171018_101740.png
>
>
> I am using GUACAMOLE in a setup with Linux, and the window manager called
> awesome.
> on the desktop I run
> x11vnc -ncache 10 -rfbauth ~/.vnc/passwd -clip xinerama1 -viewonly
> and when I connect with x11vnc the desktop is normal. When I connect with
> GUACAMOLE something goes wrong and I get to see a tiny huge page. To me it
> looks like something goes wrong with automatic scaling or the calculation of
> the screen size
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