[winswitch] How to use "randr" to resize the desktop?
Antoine Martin
antoine at nagafix.co.uk
Sat Dec 27 18:21:37 GMT 2014
Please don't top post. Again.
On 28/12/14 01:09, Heng Zhou wrote:
> I'm sorry I'm getting more and more confused. To run RandR, i.e.,
> xrandr, I have to use xpra to hold the whole desktop
This sounds like you have it backwards, but whatever.
> (if xpra forwards only application, the xpra window can resize at the
> client side. Yes it can), but the http://xpra.org/trac/wiki/Usage
> webpage requires using Xnest as a nested X11 server. I did not run
> Xdummy or Xvfb.
Xnest (or Xephyr) runs nested inside another X11 server, which can
either be Xdummy or Xvfb.
> Actually I don't know how to run Xdummy -- there is a command "xvfb"
> in ubuntu, but there is no command of Xdummy or xdummy. So I don't
> understand your reply "Xdummy supports RandR, Xvfb does not, hence the
> error.". I only run Xnest.
No you don't. Xpra runs a display server (either Xdummy or Xvfb) and you
start Xnest in it.
See the wiki page on Xdummy.
> Do you mean Xnest is equivalent to Xdummy or Xvfb?
No.
> For the former, Xdummy doesn't work on ubuntu so RANDR doesn't work.
> For the latter, Xvfb does not support GLX so metacity and all other
> OpenGL applications do not work. Am I right? If I am, which one is
> Xnest equivalent to?
Xpra supports OpenGL with Xdummy only.
AFAIK, even with Xdummy, you will not be able to get OpenGL with Xnest
or Xephyr, which you need for running a full desktop.
> And as for Xdummy, does it run automatically after I run xpra, so it
> is expected that a virtual frame buffer, or a virtual graphics card
> exists on display :100 after xpra start :100, so I can run glxgears on
> a remote Red Hat machine (on display :100), e.g., Amazon EC2 Red Hat
> instance, without any trouble like those I encountered on ubuntu,
> right? Hopefully my understanding is right.
Yes, xpra starts the virtual display server when you run "xpra start".
> Gnome Panel is the only desktop I can use on Amazon EC2 instance,
> which appears only under Xnest. If I run Xephyr, the xpra window is
> black. There are bugs anywhere in Linux world.
Xephyr works fine here.
Antoine
>
>
> On Sat, Dec 27, 2014 at 12:35 PM, Antoine Martin
> <antoine at nagafix.co.uk <mailto:antoine at nagafix.co.uk>> wrote:
>
> Please don't top post.
>
> On 28/12/14 00:25, Heng Zhou wrote:
>> Thanks for the reply. So RandR only works at the server side
>> (because window manage runs at server side); resizing at client
>> side does not work, right?
> Sort of. RandR has nothing to do with the window manager.
> You can't resize client-side because the xpra protocol does not
> support it yet.
>> But after I run the following commands at the server side:
>>
>> (1) xpra start :100
>> (2) sudo DISPLAY=:100 Xnest +extension RANDR :200 -ac -geometry
>> 800x600+24 &
>> (3) Use Xpra Launcher to connect to the server. A 800x600 Xpra
>> window comes out.
>> (4) sudo DISPLAY=:200 metacity &
>> There is an error: "Xlib: extension "RANDR" missing on display
>> ":200"."
>> (5) sudo DISPLAY=:200 gnome-settings-daemon &
>> (6) sudo DISPLAY=:200 gnome-panel &
>> The GNOME Panel desktop environment appears
>> (7) sudo DISPLAY=:200 xrandr --size 1024x768
> Xdummy supports RandR, Xvfb does not, hence the error.
>
> And don't run everything root...
>>
>> , I received an error: "RandR extension missing" and the size of
>> the Xpra window containing the whole desktop is unchanged.
> Like the error says...
>>
>> I don't know what is the matter. I also tried "sudo DISPLAY=:100
>> xrandr --size 1024x768" but nothing is changed. It seems that the
>> RANDR extension is not enabled on display :200 (or :100? I don't
>> know), but how should I enable it?
> By using Xdummy instead of Xvfb.
>> I have already include the +extension RANDR option in step (2).
>> Should I install some other packages? The server is running
>> ubuntu 14.04.
> And here is your problem again.
>>
>> Looking forward to your further clarification.
> Let's just make it crystal clear: Ubuntu is creating all these
> problems, either move away from it or be prepared to solve those
> problems on your own.
>
> Cheers
> Antoine
>
>
>
>
>>
>> On Sat, Dec 27, 2014 at 10:25 AM, Antoine Martin
>> <antoine at nagafix.co.uk <mailto:antoine at nagafix.co.uk>> wrote:
>>
>> On 27/12/14 22:18, Heng Zhou wrote:
>> > Hi,
>> >
>> > I can display a whole desktop using the instruction in
>> > http://xpra.org/trac/wiki/Usage
>> <https://urldefense.proofpoint.com/v2/url?u=http-3A__xpra.org_trac_wiki_Usage&d=AwMDaQ&c=TqceLeU8_c9CVUat-eLTFu19-lyGiWSvB_skZXlxt8Q&r=P1ABBvTuGPmJbUz5MdDh1bh-eAJtxjX6QuAJblLMVsI&m=1BG4F5DZ3vJ_ekEvx6ohg66_W_6vaZGYLu45aaV4Xhg&s=CRmtgmFewhBiPiCYnV5HnSDle3JhNjU5JfjiTc-s4EQ&e=>.
>> Now I hope I can miximize the window
>> > containing the desktop if I double click the title bar of
>> the xpra window,
>> > just like miximizing a normal window in Windows.
>> "Double-click-to-maximize" is going to be desktop environment
>> specific,
>> often mapped as a shortcut for the maximize button.
>> In this case, it is not possible because the window has a
>> fixed size,
>> and for that reason the maximize button should be disabled too.
>> > The same webpage says that
>> > "you can resize the desktop using the standard "randr"
>> desktop tools (and
>> > not by resizing the window at present)", so I think this is
>> the approach to
>> > accomplish what I want.
>> randr is the X11 protocol, you may use any tool that uses it, ie:
>> xrandr -s 1024x768
>> "man xrandr" for details
>> > But after search the internet, I still have no idea
>> > how to do it. Could you please give me a step by step
>> configuration to
>> > accomplish miximizing the window containing the whole
>> desktop by double
>> > click?
>> It cannot be done at present because the window has a fixed size.
>> There is a ticket for that:
>> http://xpra.org/trac/ticket/530
>> <https://urldefense.proofpoint.com/v2/url?u=http-3A__xpra.org_trac_ticket_530&d=AwMDaQ&c=TqceLeU8_c9CVUat-eLTFu19-lyGiWSvB_skZXlxt8Q&r=P1ABBvTuGPmJbUz5MdDh1bh-eAJtxjX6QuAJblLMVsI&m=1BG4F5DZ3vJ_ekEvx6ohg66_W_6vaZGYLu45aaV4Xhg&s=IJoQJL9km27EPxWH7M0euPBBCMIJHubITJeczUGllN8&e=>
>> It doesn't look hard to implement, I just haven't had the time.
>> > Thank you very much!
>> Cheers
>> Antoine
>>
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