Two display anomalies

[Tim]

On Tue, 2005-09-06 at 20:58 -0400, Matthew Saltzman wrote:
> (1) 
> Video card: NVIDIA GeForce 2 MX (generic)
> Monitor: Samsung SyncMaster 930B (flat panel)
> Driver: nvidia (the commercial one), but it happens as well with nv.
> Resolution: 1280x1024, 32-bit color or 16-bit color
> Sypmtom: Monitor flickers as if it's synching at very low rate.
> The monitor reports that it is syching at 75Hz, but I still see flicker.

Display refresh rate beating with the room lighting?

> (2)
> Video card: ATI Radeon Mobility 7500 in an IBM Thinkpad T41.
> Driver: radeon
> Kernel: kernel-2.6.12-1.1398_FC4
> Kernel option: video=radeonfb
> X: xorg-x11-6.8.2-37.FC4.45
> Symptom: When I use the VGA-out jack to connect to an overhead projector 
> or external monitor, the projector image ripples slowly, as though (very 
> narrow) waves are passing over it.

Sagging mains power in the projector?  Earth loops?  Monitors placed
near to another device emitting a strong EM field?

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