[winswitch] issue with forwarding x to a lower res monitor from a virtual Xvfb

Zenny garbytrash at gmail.com
Tue Nov 17 13:25:41 GMT 2015

Thanks again.

The only bottleneck remained is refreshing the display in the client
(not matter which encoding or quality is used).  Please note that it
is with Xvfb (not Xdummy). When display change takes place, say a
slide in libreoffice impress, only a quarter of display changes in
client running at (1920x1080), while the screecapture from the virtual
X server running in 4K is okay.

I start xpra server like:
$ XPRA_RANDR=0 xpra start --use-display :10 --sync-xvfb=50

and xpra client like:
$ xpra attach tcp:localhost:10000:10 --desktop-scaling=0.5
--sync-xvfb=50 --opengl=no --encoding=jpeg --quality=85

Appreciate if there is any inputs on automatically refresh the full
screen (not just quarter of the screen) in xpra client.



On 11/17/15, Antoine Martin <antoine at nagafix.co.uk> wrote:
> On 16/11/15 23:51, Zenny wrote:
>> On 11/16/15, Antoine Martin <antoine at nagafix.co.uk> wrote:
>>>>> If you are certain that you will only need a single resolution, then
>>>>> you
>>>>> could also use a customized xorg.conf
>>>>> The "desktop-scaling" option in 0.16 looks easier to me than either of
>>>>> those options.
>>>> any man pages about desktop-scaling?
>>> Can you please check before asking?
>>> man xpra
>>> And also here (the second link on the wiki):
>>> http://xpra.org/manual.html
>> Sorry I skipped the part in the man-page. Still I could not figure out
>> the sync-xvfb part in the man pages.
>> After reading the --desktop-scaling part, the parameter allows to
>> control the server's x resolution on the fly.
>> But I am trying to do the other way round. The server's virtual X
>> remains at the 4K resolution while the client's varies according to
>> the physical screen attached.
> If you know your client's resolution before you connect, you can
> calculate the ratio which will give you 4k on the server.
> It just won't handle monitor hotplugging.
> Antoine
>> Thanks again,
>> /z
>>> Antoine

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