noob dual screen question

[henge]

so, today for the first time i have been using kubuntu across two screens, my laptop screen and a VGA connected external monitor. All fine and well, with external screen arranged to the right of laptop screen.
But after i disconnected i noticed the mouse cursor was still able to slide off the screen to the right as if the eternal monitor was still connected, even after reseting display options in 'size and orientation' system settings. Only way to fix it was to reboot. Am i missing something or forgot to set something correctly?
cheers

[whatthefunk]

What kind of graphics card do you have?

[henge]

it's listed as an Intel Corporation Core Processor Integrated Graphics Controller (rev 18 ) on my system, or Integrated Intel® GMA HD on the Asus website.
cheers

[SecretCode]

When you attached the external screen, did it automatically get added to your desktop? With my nvidia card I need to manually tell the system to use it - and manually tell it to stop using it when I detach it. (I think it should be automatic, at least on removal ... but it's not.)

Since you're using intel you probably need the native kwin controls: System Settings > Display and Monitor > Multiple Monitors. Can you reset it there?

[henge]

yes, on attaching monitor via vga cable, kwin monitors settings opened automatically, but i can't seem to see an option to "tell it to stop using it" on detaching.
It reports that the screen is disconnected, but it's still there (i.e. the cursor disappears into to it to the right, and i can drag windows into it).

Is there a command to use in the terminal to tell the system the screen is detached?

[james147]

Try

xrandr --auto

if that doesn't work you should be able to use xrandr to manually disable the monitor.

This sounds like a bug in kde and I would suggest filing a bug report.

[henge]

Try

xrandr --auto

if that doesn't work you should be able to use xrandr to manually disable the monitor.

This sounds like a bug in kde and I would suggest filing a bug report.

thanks, executing this command after disconnecting second monitor ends the connection and prevents access to the 'fake' screen. no idea if it's a bug, but its strange there's no option for this in the system settings/monitors window.
thanks for all the help.