[xubuntu-users] Maximum desktop width of 7680px?

[Steve McClellan]

Problem solved.

Thanks, Allen! That gave me the nudge I needed to get this the rest of the
way figured out.

In case anyone's reading this in the future, here are the problem and how I
fixed it.

Installing and running xrandr in a terminal window yielded a line like

Screen 0: minimum 800 x 600, current 7680 x 3240, maximum 8192 x 8192
>

Problem: that 8192-pixel maximum width prevents the monitor layout I desire.

Solution: Create a new xorg.conf file by (mostly) following the
instructions at
https://wiki.debian.org/Xorg#What_if_I_do_not_have_a_xorg_config_file.3F

   - $ sudo passwd  # set up a root password
   - (Switch to a console via Ctrl+Alt+F1)
   - $ su  # log in as root
   - # /etc/init.d/lightdm stop
   - # cd /etc/X11
   - # Xorg -configure  # This creates a new file in /root/xorg.conf.new
   - # cp /root/xorg.conf.new
   /usr/share/X11/xorg.conf.d/99-steve-custom.conf
   - (log out as root with Ctrl+D)
   - $ shutdown now -r

Originally, I'd edited the file to include "Virtual 9600 2160" in each of
the "Display" subsections - as suggested by
https://wiki.ubuntu.com/X/Config/Resolution#Setting_resolution_changes_in_xorg.conf_--_resolution_lower_than_expected
- but it still worked fine when I later removed those lines.

After the restart, I was able to use Xfce's regular GUI Display tool to put
the monitors side-by-side. Success!

The first line of output from xrandr is now

Screen 0: minimum 8 x 8, current 9600 x 2160, maximum 32767 x 32767
>

Much better.

I just hope nothing ever decides to display at that new minimum size. :)

On Fri, Sep 6, 2019 at 10:43 PM Allen <keithoor at gmail.com> wrote:

> Have you tried ARandR? I always use it when I have two monitors...
>
> On 09/06/2019 05:09 PM, Steve McClellan wrote:
>
> Hi there.
>
> I'm trying to configure my monitors on my Xubuntu 18.04.3 (64-bit)
> installation.
>
> I have two 4k monitors and a 2k monitor that I'm trying to use to display
> an extremely wide (9600x2160) desktop.
>
> However, when I enter the display settings and configure the monitors
> horizontally, the right side of the rightmost monitor goes blank.
>
> The tip of the mouse pointer won't go into the blank area (as the edge of
> the blank area seems to be the edge of the desktop), but if the tip is at
> the far right of the desktop, the rest of the pointer is visible in the
> blank area.
>
> Some tinkering suggests that anything to the right of 7680 horizontal
> pixels is blanked out.
>
> If I rearrange the displays such that one is above the others (and,
> therefore, the full desktop is no more than 7680 pixels wide), all three
> monitors work perfectly. But that's not the configuration I want.
>
> A bunch of googling didn't give me any ideas.
>
> Is there a maximum-desktop-width limit somewhere in the stack that I'm
> brushing up against, or is there some weird problem with my specific setup?
>
> Thanks,
> Steve McClellan
>
>
>
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