Two display anomalies

[Matthew Saltzman]

(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.

(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.

In FC3, this behavior varied with the kernel version.  In FC4, I need this 
kernel in order to get proper ACPI behavior, so I haven't tested much.  In
WinXP, the display is rock-solid.

For (1), could this be the monitor?  It's brand new.  I also recently 
installed a TV tuner card, but that doesn't seem to be too likely a 
culprit.  I didn't *think* I was seeing the flicker before that, but it's 
my wife's monitor, so I didn't spend much time with it.  My machine (CRT, 
no TV tuner) is rock solid.

If it's not the monitor, what should I be looking for to further isolate 
the problem?

For (2), I'm pretty convinced it's a bug, but I' not sure what component 
to report it against.  In FC3, it varied with kernel version, with 
whatever XFree/xorg was installed.  So I'm sort-of thinking kernel.

Thanks for any suggestions.

-- 
 		Matthew Saltzman

Clemson University Math Sciences
mjs AT clemson DOT edu
http://www.math.clemson.edu/~mjs