[lubuntu-users] Upgraded to Lubuntu 16.10, lost monitor detection

[Israel]

On 11/11/2016 10:37 AM, Aere Greenway wrote:
> On 11/11/2016 01:43 AM, Ben Coleman wrote:
>> I've just upgraded one of my machines from Lubuntu 16.04 to Lubuntu
>> 16.10, and find that my resolution has gone from 1600x900 to 1280x1024.
>> The video adapter is an Nvidia Geforce 6200, and the monitor is an Acer
>> K222HQL, attached via DVI.  The monitor was correctly detected under
>> 16.04, but I now find that the Monitor Settings dialog shows it as a
>> 'Default Monitor'.  This failure to detect the monitor occurs whether
>> I'm using the Nvidia binary driver or using the Nouveau driver.  Any
>> idea if this is a know bug, or if there is anything I can do to fix it?
>>
>> Ben
>>
>>
>>
>
> Ben:
>
> This problem has affected me too. 
>
> At least two of the monitors in my test bed are now treated as default
> monitors - including a fairly modern Samsung SyncMaster 2220 WM. 
>
> There is a complicated way, using a command-line interface, that
> allows you to overcome this. 
>
> Unfortunately, as is typical of command-line interfaces, it requires
> you to remember a lot of detailed information, and I have already
> forgotten how to fix it, and can't find the e-mails from this list
> that enabled me to work-around the problem. 
>
> It would be good if under "Preferences", the "Monitor Settings" tool,
> would let you set the display to parameters you knew worked before
> upgrading to the new system level, but it does not provide this. 
>
> I hope there is a good reason so much currently working hardware is
> being abandoned by Linux. 
>
> On the other hand, if this abandonment is accidental (and some list
> was accidentally left out), that the problem could possibly be
> corrected. 
> -- 
> Sincerely,
> Aere
>
>

arandr is a good program for testing out different resolutions (much
better than the default Lubuntu program IMO)

You could use that to set things up.  It will make a script for you, and
if need be you can manually run that script.

There is a long way to make it automatic.  I use one for HDMI displays
that might help (it is from the archlinux wiki:
https://wiki.archlinux.org/index.php/PulseAudio/Examples#HDMI_output_configuration)

Here are the three files:

/etc/udev/rules.d/99-hdmi_sound.rules

KERNEL=="card0", SUBSYSTEM=="drm", ACTION=="change",
RUN+="/usr/bin/systemctl start hdmi_sound_toggle.service"

/etc/systemd/system/hdm_sound_toggle.service

[Unit]
Description=hdmi sound hotplug

[Service]
Type=simple
RemainAfterExit=no
ExecStart=/usr/bin/hdmi_sound_toggle.sh

[Install]
WantedBy=multi-user.target

And the script: /usr/bin/hdmi-switch

#!/bin/bash
USER_NAME=$(w -hs | awk -v vt=tty$(fgconsole) '$0 ~ vt {print $1}')
USER_ID=$(id -u "$USER_NAME")
HDMI_STATUS=$(</sys/class/drm/card0/*HDMI*/status)

export PULSE_SERVER="unix:/run/user/"$USER_ID"/pulse/native"

if [[ $HDMI_STATUS == connected ]]
then
   sudo -u "$USER_NAME" pactl --server "$PULSE_SERVER" set-card-profile
0 output:hdmi-stereo+input:analog-stereo
else
   sudo -u "$USER_NAME" pactl --server "$PULSE_SERVER" set-card-profile
0 output:analog-stereo+input:analog-stereo
fi

This obviously has more than you need (you don't need the pulse portion).

But you could check for the external display being plugged in and run
the code in the script arandr generates, and similarly run one generated
by arandr when it is unplugged.

That said, it would be really nice to do this automatically, even to the
point that you could have a one size fits all approach (using output
from xrandr and getting values to plug into your script without need for
the user needing to know what any of that stuff means).


This should get you started (the hard way), or give you a simple
solution (arandr) for manually changing it, or allow you to copy the
arandr scripts to /usr/local/bin/ (rename them to something like
monitor-plugged-in.sh and laptop-display.sh) and then just run them, OR
make desktop files and save them to your desktop, or put them in
/usr/share/applications/

If anything I have said sounds too complicated, please do ask and we
would be glad to go into detail about things.  Even simple questions are
welcome.  Do not think any question you ask is 'silly'.  We are here to
help :D

-- 
Regards

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