Subject: Re: Horrible Screen Flashes
To: tiger shiao <>
From: Chris Tribo <>
List: current-users
Date: 05/31/2001 11:35:47
On Thu, 31 May 2001, tiger shiao wrote:

> I'm using NetBSD 1.5 on a Dell OptiPlex GX110, with i810 
> video-on-motherboard. I'm using XFree86 4.0.2 with a package I got from this 
> list(agppart.o?). Recently, when i "startx", my screen "flashes" once a 
> while(it's like a lightening from inside my screen, with a sound,seems the 
> hardware is not funcationing well), then i return to text mode, but this 
> morning i found the same problem under text mode, i'm scared to death and 
> switched to linux &window nt(multiboot system), but all my stuff is really 
> on NetBSD, what should i do?
> for the screen, i configured the frequency--vertical and horizontal 
> correctly, i believe.
> save my life...

	This sounds like screen arcing, or your deflection circuitry is
about to bite the dust. Any monitor made within the last 5 years should
have oversync protection, and would not allow itself to be
oversync'd. It's more likely that this is a problem with the monitor and
having nothing to do with the computer or OS. That being the case, you
should probably have it inspected by a "qualified technician."