Two display anomalies (one FIXED, but not explained, one left open)

[Matthew Saltzman]

On Wed, 7 Sep 2005, Bob Chiodini wrote:

> On Tue, 2005-09-06 at 23:01 -0400, Matthew Saltzman wrote:
>> On Tue, 6 Sep 2005, Bob Chiodini wrote:
>>
>>> 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.

Strange, this morning, the monitor is perfect.  Even the auto-adjust works 
(forgot to mention that it was aligning the image too far left).  And I 
didn't touch anything.

I'm almost afraid to try rebooting.  But I'll keep the synch advice handy 
in case I see a recurrence.

That leaves this one:

>>>>
>>>> (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.

I'll check refresh rate in XP and Linux and test some cables and report 
back.

Thanks for the help so far.

>>>>
>>>>[...]
>>>>
>>>> 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,
>
> When I needed to switch from a tube to an LCD, I
> edited /etc/X11/xorg.conf and changed the upper vertical refresh rate to
> 60.
>
> Bob...
>
>
>

-- 
 		Matthew Saltzman

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