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curmudgeon
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Joined: 08 Aug 2003
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 Posted: Mon Jun 10, 2024 1:47 pm Post subject: adding command line options to X |
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| This probably sounds like a dumb question (I just spent the last hour looking for an answer without finding one, though), but where do I configure command line options to X (starting X with lxdm as the display manager)? In particular, I want to add +iglx (disabled by default). |
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netfab
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Joined: 03 Mar 2005
Posts: 1956
Location: 127.0.0.1
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| Posted: Mon Jun 10, 2024 4:07 pm Post subject: |
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Here with Xfce :
- the displaymanager is calling a Xfce initialization script (/usr/bin/startxfce4)
- the Xfce initialization script is calling /etc/X11/xinit/xserverrc
In my case it seems there is no way to configure any variable to add some command line option to X.
But I think that could depend on your desktop initialization script.
Anyway, you can hardcode your desired option to /etc/X11/xinit/xserverrc, I guess your desktop should run it in the middle of the initialization process.
Another way would be to copy /etc/X11/xinit/xserverrc to your ~ to modify it, but again, that depends on your desktop initialization script.
For example in /usr/bin/startxfce4 we can find :
| Code: |
if [ -f "$HOME/.xserverrc" ]; then
SERVERRC="$HOME/.xserverrc $SERVERRC"
elif [ -f /etc/X11/xinit/xserverrc ]; then
SERVERRC="/etc/X11/xinit/xserverrc $SERVERRC"
fi
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curmudgeon
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Joined: 08 Aug 2003
Posts: 1744
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| Posted: Mon Jun 10, 2024 7:43 pm Post subject: |
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| netfab wrote: | Here with Xfce :
- the displaymanager is calling a Xfce initialization script (/usr/bin/startxfce4)
- the Xfce initialization script is calling /etc/X11/xinit/xserverrc
In my case it seems there is no way to configure any variable to add some command line option to X.
But I think that could depend on your desktop initialization script.
Anyway, you can hardcode your desired option to /etc/X11/xinit/xserverrc, I guess your desktop should run it in the middle of the initialization process.
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I run lxdm as the display manager, and lumina as the desktop environment. After all of these years, I still feel confused about what gets started when (and how). Do I have this correct? The display manager (in the traditional case with display-manager in /etc/runlevels/default) starts X (even before anyone logs in). When a user logs in, the dsiplay manager calls another script (or in my case, a binary file - /usr/bin/start-lumina-desktop) to start the X session.
In my case, I want the option enabled when X starts (before anyone logs in locally). I intend to log in via ssh and run programs on the remote machine.
| netfab wrote: |
Another way would be to copy /etc/X11/xinit/xserverrc to your ~ to modify it, but again, that depends on your desktop initialization script.
For example in /usr/bin/startxfce4 we can find :
| Code: |
if [ -f "$HOME/.xserverrc" ]; then
SERVERRC="$HOME/.xserverrc $SERVERRC"
elif [ -f /etc/X11/xinit/xserverrc ]; then
SERVERRC="/etc/X11/xinit/xserverrc $SERVERRC"
fi
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How would the X server know which user's home directory to look in for xserverrc before anyone has logged in via the display manager?
One would think that the X server would have a configuration file.
I see a place to run X with options in /etc/X11/xinit/xserverrc:
| Code: |
#!/bin/sh
if [ -z "$XDG_VTNR" ]; then
exec /usr/bin/X -nolisten tcp "$@"
else
exec /usr/bin/X -nolisten tcp -keeptty "$@" "vt$XDG_VTNR"
fi
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But I have no idea where "$@" or "vt$XDG_VTNR" get set (or what program uses them). |
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netfab
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Joined: 03 Mar 2005
Posts: 1956
Location: 127.0.0.1
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| Posted: Mon Jun 10, 2024 8:46 pm Post subject: |
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| Quote: |
After all of these years, I still feel confused about what gets started when (and how).
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Yes, you're not alone. Things are complicated.
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The display manager [...] starts X (even before anyone logs in). When a user logs in, the dsiplay manager calls another script [...] to start the X session.
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Yes, you're right, I made a mistake in my previous post : in my case, starxfce4 does not call /etc/X11/xinit/xserverrc.
My display manager is having a configuration file (/etc/slim.conf) where we find theses lines :
| Code: |
default_xserver /usr/bin/X
#xserver_arguments -dpi 75
xserver_arguments -nolisten tcp -deferglyphs 16
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SLim and X are running as root :
| Code: |
$ ps aux | grep slim
root 2636 0.0 0.1 25600 16720 ? Ss 09:09 0:00 /usr/bin/slim
root 2643 8.1 1.0 6974524 165484 tty7 Ssl+ 09:09 64:42 /usr/bin/X -nolisten tcp -deferglyphs 16 -auth /var/run/slim.auth vt07
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Maybe lxdm is having similar configuration entries ?
I think that the xserverrc file I talk about is used when running X through startx with your ~user, without any display manager. |
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curmudgeon
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Joined: 08 Aug 2003
Posts: 1744
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| Posted: Mon Jun 10, 2024 11:50 pm Post subject: |
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| netfab wrote: |
My display manager is having a configuration file (/etc/slim.conf) where we find theses lines :
| Code: |
default_xserver /usr/bin/X
#xserver_arguments -dpi 75
xserver_arguments -nolisten tcp -deferglyphs 16
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SLim and X are running as root :
| Code: |
$ ps aux | grep slim
root 2636 0.0 0.1 25600 16720 ? Ss 09:09 0:00 /usr/bin/slim
root 2643 8.1 1.0 6974524 165484 tty7 Ssl+ 09:09 64:42 /usr/bin/X -nolisten tcp -deferglyphs 16 -auth /var/run/slim.auth vt07
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Maybe lxdm is having similar configuration entries ? |
I do see something in /etc/lxdm/lxdm.conf that looks of interest, but apparently says "not fully functional."
| Code: |
[server]
## arg used to start xserver, not fully function
# arg=/usr/bin/X -background vt1
# uncomment this if you really want xserver listen to tcp
# tcp_listen=1
# uncoment this if you want reset the xserver after logou
# reset=1
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| Code: |
$ ps auwx | grep lxdm
root 2444 0.0 0.0 4720 3452 ? Ss Jun09 0:00 /usr/sbin/lxdm-binary
root 2501 0.2 0.6 553848 113324 tty7 Ssl+ Jun09 6:22 /usr/bin/X :0 vt07 -nolisten tcp -novtswitch -auth /var/run/lxdm/lxdm-:0.auth
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Where does the "-novtswitch" option come from (that location suggests a place to add other options)? A search for vtswitch via grep in all of /etc/ turned up no matches. |
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netfab
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Joined: 03 Mar 2005
Posts: 1956
Location: 127.0.0.1
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| Posted: Tue Jun 11, 2024 6:48 am Post subject: |
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| Quote: |
Where does the "-novtswitch" option come from (that location suggests a place to add other options)?
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No. It comes form lxdm itself :
https://sourceforge.net/p/lxdm/code/ci/master/tree/src/lxdm.c#l503
| Code: |
if(!novtswitch)
{
arg[arc++] = g_strdup("-novtswitch");
}
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Reading this function I'm afraid that there is no way to add custom options with lxdm without patching it. |
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Hu
Administrator
Joined: 06 Mar 2007
Posts: 22626
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| Posted: Tue Jun 11, 2024 12:02 pm Post subject: |
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With the caveat that I only spent a few minutes reading the source that netfab linked, and have no other experience with lxdm, I suspect it may be possible (albeit inconvenient) to add options. On https://sourceforge.net/p/lxdm/code/ci/master/tree/src/lxdm.c#l446 and #l447, the program loads (seemingly from a configuration file) a path to the X server and, if none was found, defaults it to /usr/bin/X. I suggest using that configuration file to set a path to a custom "X server" that is really a shell script such as: | /home/me/bin/wrap-start-X.sh: | #!/bin/sh
exec /usr/bin/X --my-custom-argument1 "$@" |
This will allow you to add/remove arguments before the real X starts. |
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Ralphred
l33t
Joined: 31 Dec 2013
Posts: 652
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| Posted: Tue Jun 11, 2024 12:28 pm Post subject: |
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| curmudgeon wrote: | I do see something in /etc/lxdm/lxdm.conf that looks of interest, but apparently says "not fully functional."
| Code: |
[server]
## arg used to start xserver, not fully function
# arg=/usr/bin/X -background vt1
# uncomment this if you really want xserver listen to tcp
# tcp_listen=1
# uncoment this if you want reset the xserver after logou
# reset=1
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It may not be "fully functional", but if you just add/alter the line to read | Code: | | arg=/usr/bin/X +iglx |
it works. |
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