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

Antoine Martin antoine at nagafix.co.uk
Mon Nov 16 16:07:04 GMT 2015

>>>>>>>>>>> I have tested here with Xdummy and that worked fine.
>>>>>>>>>> Can you share your Xdummy command if different from the one in the
>>>>>>>>>> wiki?
>>>>>>>>> I am using the one that gets generated in the xpra.conf like so:
>>>>>>>>> export DISPLAY=:10
>>>>>>>>> xpra_Xdummy -noreset -nolisten tcp +extension GLX +extension RANDR
>>>>>>>>> +extension RENDER -auth $XAUTHORITY -logfile
>>>>>>>>> ${HOME}/.xpra/Xorg.${DISPLAY}.log -configdir
>>>>>>>>> ${HOME}/.xpra/xorg.conf.d
>>>>>>>>> -config /etc/xpra/xorg.conf $DISPLAY
>>>>>>>> Thanks for sharing, but ould not figure out 'xpra_Xdummy' :
>>>>>>> http://xpra.org/trac/browser/xpra/trunk/src/scripts/xpra_Xdummy
>>>>>> Thanks for very useful pointer:
>>>>>> But how to specify the screen resolution with xpra_Xdummy (as you have
>>>>>> suggested as quoted below)? In my case I need 4K in the virtual x
>>>>>> server in server and 1K in the client, fyi
>>>>>> export DISPLAY=:10
>>>>>> xpra_Xdummy -noreset -nolisten tcp +extension GLX +extension RANDR
>>>>>> +extension RENDER -auth $XAUTHORITY -logfile
>>>>>> ${HOME}/.xpra/Xorg.${DISPLAY}.log -configdir ${HOME}/.xpra/xorg.conf.d
>>>>>> -config /etc/xpra/xorg.conf $DISPLAY
>>> Use xrandr to change the resolution.
> How to make changes in the virtual X server with xrandr. It could be
> possible with xrandr, however my requirement is 4K in the server while
> displaying the same content in FullHD or lower in the clients. It is a
> bit confusing how to use xrandr to get two different resolutions in
> server and client! Would you mind elaborating?
Using xrandr to change resolutions can be useful in two cases:
* you start the Xvfb yourself and use xpra in shadow mode, in this case 
xpra does not try to change the resolution for you
* you tell xpra not to do randr (with XPRA_RANDR=0)

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.

That's assuming that you are using Xdummy. If you use Xvfb, then this is 
all moot.


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