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Month: December 2016

Re: two unique tdecmshell xserver instances at once possible?

From: deloptes <deloptes@...>
Date: Thu, 01 Dec 2016 08:50:23 +0100
Felix Miata wrote:

> deloptes composed on 2016-12-01 01:17 (UTC+0100):
>> Felix Miata wrote:
>>> deloptes composed on 2016-11-30 07:30 (UTC+0100):
>>>> Felix Miata wrote:
>>>>> xserver
>>>> In your example I don't see how you are passing the display number to
>>>> xserver command
>>> I've not been, and adding it doesn't change anything. I'm not trying to
>>> start a server. I'm trying to alter the already running server from
>>> within the running server. The commands are all run on screen :0 in the
>>> instant case. Why does the first instance work as expected (as it has
>>> since it was KDE3 and probably KDE2 before) without specifying a screen?
>> I was thinking you want to run xserver on different port/screen
> That I know how to do when it's what I want to do. :-)

The thing is we don't know and above this the "why" is not clear :)

>>>>        All  of  the  X  servers  accept the command line options
>>>>        described
>>>> below.  Some X servers may have alternative ways of providing the
>>>> parameters
>>>>        described here, but the values provided via the command line
>>>>        options
>>>> should override values specified via other mechanisms.
>>>>        :displaynumber
>>>>                The X server runs as the given displaynumber, which by
>>>> default is 0.  If multiple X servers are to run simultaneously on  a
>>>> host, each
>>>>                must  have  a unique display number.  See the DISPLAY
>>>>                NAMES
>>>> section of the X(7) manual page to learn how to specify which display
>>>> number
>>>>                clients should try to use.
>>> # man X(7)
>>> bash: syntax error near unexpected token '('.
>>> # man X
>>> no manual entry for X
>> Strange I have man for Xorg and for X - perhaps you are missing
>> something.
> 'man Xorg' works here.
> I think you are trying to teach me how to do what I already know how to
> do, which has nothing to do with the purpose of the exercise.
>> And I have full featured man page for tdecmshell
> On openSUSE, or on a Debian? (sidetracking....)
debian (of course)

>>> # tdecmshell --help-all only shows a displayname option, no
>>> # displaynumber tdecmshell --help-all
>>> Usage: kcmshell [Qt-options] [KDE-options] [options] module...
>>> Says nothing about server options.
>>    Qt options:
>>        --display <displayname>
>>               Use the X-server display 'displayname'
>>> What is shown in is all from a
>>> single running instance of starttde, not some cut and paste hocus pocus.
>>> ???
>> What you show on the image means you change the DPI on display :0
>> (default) and it will impact all programs run there.
> Not exactly. Correct WRT :0. It has no effect on any program already open
> on :0, which is one half of the point of the exercise. The xrandr DPI
> change only affects programs opened after running it. I want before and
> after screenshots, purely for the purpose of showing someone what does and
> does not change as a result of a DPI configuration change. I succeeded in
> the bulk of reaching my goal, but inelegantly by using xterms instead of
> before and after tdecmshells I was expecting to be able to utilize. With
> tdecmshell I was expecting its own UI to demonstrate non-text effects on
> UI sizing, but most important was the text impact.

Of course you can not change the DPI of already running programs, because
they have already got the DPI value when starting.

>> I haven't spent too much time with X, but also not too less. AFAIR it was
>> 1.GPU -> 1.Screen -> 1..n Display(s)
>> In general I do not understand what you want to achieve
> Clearly. :-)
> - you can not run a
>> Xserver from within Xserver and let it bind to the same screen port which
>> is already taken by the first Xserver running. In my opinion you can run
>> xserver on :1 or :2 from the native console (but it would require more
>> work to run applications there ... see session management)
>> man xserver
>> ...
>>        -dpi resolution
>>                sets  the  resolution  for all screens, in dots per inch. 
>>                To
>> be used when the server cannot determine the screen size(s) from the
>> hard‐
>>                ware.
>> At least AFAIR this is what vnc is doing, where (AFAIR) you specify the
>> port example :5 and then can connect from remote to xserver on :5 remote
>> via vnc.
> I've been using multiple "screens" on the same display (:0, :1 and/or :2
> running "simultaneously") forcing resolutions and DPIs for roughly a
> decade (mostly on test installations, rarely on my 24/7 systems). I only
> do it one of two ways though, never according to the man excerpt above,
> and never (except very occasionally very temporarily) via a dpi setting
> squirreled away in some DE's config file, and very very rarely using
> Xft.dpi (see: [2]). Either I run xrandr in a startup script[1], or via
> DisplaySize and/or PreferredMode in /etc/X11/xorg.conf*.

You are misunderstanding the display term (I think). Display is not your
monitor. It is a virtual entity.

> [1] (with a single # removed
> [according to
> result desired)
> [2]

I will have to look into the links later, but from what I know it is not
possible to set DPI per application on the same screen/server. It could be
that you can change the font size (what we actually already have), but this
is a different story.


PS: and I am not teaching, I am just sharing my knowledge and learning
something in the same time.