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[Bug 830949] Re: [Intel N10 Graphics] Plugging in external monitor to VGA port makes both displays corrupted with thick slanted lines

 

I have a dell mini 9. It should be very similar CPU (if not the same) as the N10.
I updated it today.
Following that, I plug in an external monitor (max res 1280x1024) through a VGA cable. I was able to run Unity in these configuration:

laptop: 1024x600  external monitor: 800x600: no major issue to report.
Unity works well.

laptop: 1024x600  external monitor: 832x624: no major issue to report.
Unity works well.

laptop: 1024x600  external monitor: 1024x768: starting to see some empty
regions on the external monitor (black). Probably the limited video
memory of the dell mini 9 is kicking in...

laptop: 1024x600  external monitor: 1152x864: unusable

My dell mini 9 system only has 1 GigaByte of RAM so it is possible that
past a certain resolution, the system can't handle an external monitor
correctly. It is also likely that the driver doesn't provide much help
either...

However, I couldn't reproduce the bug as reported here. From the picture
of the bug, it looks like the system is trying to drive an HD monitor;
probably one with an even higher resolution than my external monitor.
So, I wonder if the system has enough RAM for that. Even if it does, we
can't be certain how that RAM it is allocated (between the GPU and the
CPU).

 - Is it possible to know the details of that particular system (in the picture): how much RAM does it has?
 - What is the resolution of the external monitor?
 - Is it possible to lower the external monitor resolution when setting up a multi-monitor configuration?
 - Does the problem shown in the picture still occurs when the external monitor resolution is at its lowest?

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https://bugs.launchpad.net/bugs/830949

Title:
  [Intel N10 Graphics] Plugging in external monitor to VGA port makes
  both displays corrupted with thick slanted lines

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