I use this dell machine at work for extended periods and usually have it connected to a 23" external monitor. Every now and then, a wavy flickering pattern appears on the screen and moves rapidly. It makes me dizzy as if I was on a boat at sea X(
It has the Intel Graphics on board and I have the opensource driver installed by default. I don't think any propitiatory driver is available for this chip.
Linux mymachine 3.0.0-16-generic #28-Ubuntu SMP Fri Jan 27 17:44:39 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux
This happens, or at least largely visible, on the external monitor. The image on laptop screen appears fine. I am sure the screen is in good working condition, I have double checked by trading my external monitor with a work mate and I can still see the issue on my screen. I only have Ubuntu 11.04 on my laptop so I cant confirm that this is not a hardware issue with my motherboard. If there is anything that could help me identify the source of issue (besides loading other OS on it) I would happily give it a shot.
The graphic card is an onboard intel chip:
00:02.0 VGA compatible controller: Intel Corporation Core Processor Integrated Graphics Controller (rev 02)
Let me know if I can add any more information to the question to help debug this issue.