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

[Zenny]

Forgot to mention that xpra is upgraded to the 0.16.0.1 beta before
the two updates were posted and tested in order to test whether
http://xpra.org/trac/ticket/976 was taken care of. Thanks!

On 11/15/15, Zenny <garbytrash at gmail.com> wrote:
> On 11/15/15, Zenny <garbytrash at gmail.com> wrote:
>> Please find some more updates:
>>
>> §1 If I use Xdummy with xpra (as described in the wiki) and try to
>> capture with ffmpeg the virtual console at 4k while displaying the
>> remote in 1080p, it categorically reports as of below and fails to
>> capture:
>>
>> [x11grab @ 0x2b2dc00] Capture area 3840x2160 at position 0.0 outside
>> the screen size 1920x1080
>> :10: Invalid argument
>>
>> §2 If I use Xvfb directly with a single application (say xterm), and
>> run 'xpra start --use-display :10', it allows to screencapture, but
>> the capture of the window is dead black. (see attachment)
>
> Running single application works fine except screencapture of that X
> instance be captured and the screencapture shows a black placeholder
> of the size of the remote display size where the application was
> running as seen in the screenshot. This one is with libreoffice
> impress running an animated presentation, but rendered black. Earlier
> was from a xterm.
>
>>
>> §3. As in §2 above, if I start a DE like (LXDE or i3), I get the
>> xrandr errors and the remote screen freezes.
>
> It categorically states in the xpra initialization window that:
>
> lib:  extension "RANDR" missing on display ":100".
>
> And on the remote end (laptop at lower resolution) outputs:
>
> Screen1 @ 0.0,3840x2160:Calibration curves could not be loaded.
>
> and freezes.
>
>>
>> Thanks!
>>
>> On 11/15/15, Zenny <garbytrash at gmail.com> wrote:
>>> On 11/15/15, Antoine Martin <antoine at nagafix.co.uk> wrote:
>>>> 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 checked Xdummy related to Ubuntu instruction at
>>>>> https://www.xpra.org/trac/wiki/Xdummy, but to no avail.
>>>> Are you using Xvfb or Xdummy? What distribution and version?
>>>>> Any hints would be highly appreciated. Thanks!
>>>> You may also be interested in the following 0.16 features:
>>>> * ability to NOT change the virtual display to match the client's
>>>> resolution using:
>>>> XPRA_RANDR=0 xpra start ...
>>>> See:
>>>> http://xpra.org/trac/changeset/11229
>>>> Shadow mode is A LOT less efficient than the regular "start" mode.
>>>> * desktop scaling, which allows you to upscale or downscale the server
>>>> resolution when displayed on the client:
>>>> http://xpra.org/trac/ticket/976
>>>> So you could render at 4k and display at 2k for example (though the
>>>> main
>>>> purpose of this ticket is to do the opposite to save bandwidth).
>>>> * "sync-xvfb" fix for screen capture tools:
>>>> http://xpra.org/trac/ticket/988
>>>>
>>>> Cheers
>>>> Antoine
>>>>
>>>>>
>>>>> Cheers,
>>>>> /z
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>>>>
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>>>
>>
>