[gentoo-user] Very OT - Displaylink adapter and setting up X

[gentoo-user] Very OT - Displaylink adapter and setting up X

[Michael Sullivan]

I feel really stupid asking this, but I want to use an HDMI component to
output one of my PCs to the TV set.  I've followed all of the wiki entry
at http://wiki.gentoo.org/wiki/DisplayLink, but there's something else I
need to know.  I get the green screen on the TV that it mentions when
the kernel module is being loaded correctly.  The problem is that I use
gdm in /etc/conf.d/xdm DISPLAYMANAGER variable to start X, and I don't
know where the actual gdm configuration lives so I can tell it to use
~/.xinitrc2 from the wiki.  My google searching hasn't been going well.
 Can anybody give me any hints as to how to make progress on this problem?

Re: [gentoo-user] Very OT - Displaylink adapter and setting up X

[Robert David]

V Mon, 12 Mar 2012 17:24:47 -0500
Michael Sullivan <msulli1355@gmail.com> napsáno:

> I feel really stupid asking this, but I want to use an HDMI component
> to output one of my PCs to the TV set.  I've followed all of the wiki
> entry at http://wiki.gentoo.org/wiki/DisplayLink, but there's
> something else I need to know.  I get the green screen on the TV that
> it mentions when the kernel module is being loaded correctly.  The
> problem is that I use gdm in /etc/conf.d/xdm DISPLAYMANAGER variable
> to start X, and I don't know where the actual gdm configuration lives
> so I can tell it to use ~/.xinitrc2 from the wiki.  My google
> searching hasn't been going well. Can anybody give me any hints as to
> how to make progress on this problem?
> 

Hi Michael,

it depends on how you would like to use the external card. Please
specify your scenario. 
Anyway, try to look in /etc/gdm, /etc/init.d/xdm, /etc/X11 (there can
be specified which server start in file xdm/Xservers)

I have DL adapter connected to my docking station and a simple script
to activate the second xserver on docking and deactivate that when
undocking. I simply run here second desktop using x2x. I just use that
primary for web browser, so I dont need xinerama.

You can also use DL with your primary card and xinerama. But it needs
specific xorg.conf and needs to be connected when xserver starting. So
nothing suitable for notebook and hotplug.

Robert.

Re: [gentoo-user] Very OT - Displaylink adapter and setting up X

[Michael Mol]

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On 03/14/2012 08:11 AM, Robert David wrote:
> V Mon, 12 Mar 2012 17:24:47 -0500
> Michael Sullivan <msulli1355@gmail.com> napsáno:
>
>> I feel really stupid asking this, but I want to use an HDMI component
>> to output one of my PCs to the TV set.  I've followed all of the wiki
>> entry at http://wiki.gentoo.org/wiki/DisplayLink, but there's
>> something else I need to know.  I get the green screen on the TV that
>> it mentions when the kernel module is being loaded correctly.  The
>> problem is that I use gdm in /etc/conf.d/xdm DISPLAYMANAGER variable
>> to start X, and I don't know where the actual gdm configuration lives
>> so I can tell it to use ~/.xinitrc2 from the wiki.  My google
>> searching hasn't been going well. Can anybody give me any hints as to
>> how to make progress on this problem?
>>
> Hi Michael,
>
> it depends on how you would like to use the external card. Please
> specify your scenario. 

So my laptop has a built-in display and a VGA output. While working, I
use both. In fact, here's the content of the script I run when logging
in to arrange things the way I like them:

#!/bin/sh
xrandr --output LVDS1 --auto
xrandr --output VGA1 --off # Force a full reset of VGA1
xrandr --output VGA1 --left-of LVDS1 --auto


Let's say I were able to set up the DisplayLink adapter using "xrandr
--output FBUSB1 --auto". The effect I'm looking for could then be
achieved via:

#!/bin/sh
xrandr --output LVDS1 --auto
xrandr --output VGA1 --off
xrandr --output VGA1 --left-of LVDS1 --auto
xrandr --output FBUSB1 --off
xrandr --output FBUSB1 --left-of VGA1 --auto

In effect, I want all three displays arranged as part of the same
extended desktop with xinerama. (xinerama is pretty explicitly part of
my workflow, as one thing I often do is have 3-4 remote desktops active
*per local display*, and I drag them around as necessary.

> Anyway, try to look in /etc/gdm, /etc/init.d/xdm, /etc/X11 (there can
> be specified which server start in file xdm/Xservers)
>
> I have DL adapter connected to my docking station and a simple script
> to activate the second xserver on docking and deactivate that when
> undocking. I simply run here second desktop using x2x. I just use that
> primary for web browser, so I dont need xinerama.
>
> You can also use DL with your primary card and xinerama. But it needs
> specific xorg.conf and needs to be connected when xserver starting. So
> nothing suitable for notebook and hotplug.

This latter scenario is what I'd be interested in. I'd have no
complaints if I needed it plugged in when X started; that's fine, if a
bit weird. (though it couldn't be done via xrandr? Seriously?)

I don't do anything with hotplug, really. I don't use PulseAudio, I
don't use GNOME, KDE or udev automount. About the only automagic thing I
use is NetworkManager (and even that fails to notice when the laptop's
moved five miles away from the AP it was connected to.).



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Re: [gentoo-user] Very OT - Displaylink adapter and setting up X

[Michael Mol]

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On 07/06/2013 01:31 PM, Michael Mol wrote:
> On 03/14/2012 08:11 AM, Robert David wrote:
>> V Mon, 12 Mar 2012 17:24:47 -0500
>> Michael Sullivan <msulli1355@gmail.com> napsáno:
>>
>>> I feel really stupid asking this, but I want to use an HDMI component
>>> to output one of my PCs to the TV set.  I've followed all of the wiki
>>> entry at http://wiki.gentoo.org/wiki/DisplayLink, but there's
>>> something else I need to know.  I get the green screen on the TV that
>>> it mentions when the kernel module is being loaded correctly.  The
>>> problem is that I use gdm in /etc/conf.d/xdm DISPLAYMANAGER variable
>>> to start X, and I don't know where the actual gdm configuration lives
>>> so I can tell it to use ~/.xinitrc2 from the wiki.  My google
>>> searching hasn't been going well. Can anybody give me any hints as to
>>> how to make progress on this problem?
>>>
>> Hi Michael,
>>
>> it depends on how you would like to use the external card. Please
>> specify your scenario. 
> So my laptop has a built-in display and a VGA output. While working, I
> use both. In fact, here's the content of the script I run when logging
> in to arrange things the way I like them:
>
> #!/bin/sh
> xrandr --output LVDS1 --auto
> xrandr --output VGA1 --off # Force a full reset of VGA1
> xrandr --output VGA1 --left-of LVDS1 --auto
>
>
> Let's say I were able to set up the DisplayLink adapter using "xrandr
> --output FBUSB1 --auto". The effect I'm looking for could then be
> achieved via:
>
> #!/bin/sh
> xrandr --output LVDS1 --auto
> xrandr --output VGA1 --off
> xrandr --output VGA1 --left-of LVDS1 --auto
> xrandr --output FBUSB1 --off
> xrandr --output FBUSB1 --left-of VGA1 --auto
>
> In effect, I want all three displays arranged as part of the same
> extended desktop with xinerama. (xinerama is pretty explicitly part of
> my workflow, as one thing I often do is have 3-4 remote desktops active
> *per local display*, and I drag them around as necessary.
>
>> Anyway, try to look in /etc/gdm, /etc/init.d/xdm, /etc/X11 (there can
>> be specified which server start in file xdm/Xservers)
>>
>> I have DL adapter connected to my docking station and a simple script
>> to activate the second xserver on docking and deactivate that when
>> undocking. I simply run here second desktop using x2x. I just use that
>> primary for web browser, so I dont need xinerama.
>>
>> You can also use DL with your primary card and xinerama. But it needs
>> specific xorg.conf and needs to be connected when xserver starting. So
>> nothing suitable for notebook and hotplug.
> This latter scenario is what I'd be interested in. I'd have no
> complaints if I needed it plugged in when X started; that's fine, if a
> bit weird. (though it couldn't be done via xrandr? Seriously?)
>
> I don't do anything with hotplug, really. I don't use PulseAudio, I
> don't use GNOME, KDE or udev automount. About the only automagic thing I
> use is NetworkManager (and even that fails to notice when the laptop's
> moved five miles away from the AP it was connected to.).
>
>

Whups. That was the wrong thread. :)



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