From my years in the television business I can guess that
what's happened is that your refresh has slowed. Once you go below a
certain refresh rate, you see flicker.
Can you increase the refresh rate? Nothing may actually be wrong at
all, if it's the screen. I ran 1024X768 at 43Hz, and saw no flicker,
but my kids did, and complained of it when the screen was cold, which
it would be after a suspend. The frequency you see flicker at varies
(time of day, hangover, lighting, etc) . If the console had a faster
refresh then X, it would all be explained.
On Sun, 29 Aug 1999, Peter Amstutz wrote:
> Hello all, I've seen a little display problem with X on my new laptop (ATI
> Rage Pro LT chipset) and was wondering if anyone else had see this.
>
> I got X working quite easily using the vesafb/modified mach64 server trick
> (see method #2 at http://www.eecs.umich.edu/~steveh/inspiron/#xserver), so
> I boot up with a graphical console. However, I have seen one annoying
> problem and I was wondering if anyone else has seen it. Sometimes, when I
> bring the system out of suspend mode (or for whatever reason the LCD has
> been powered down) when the screen turns back on I get these flickery in
> X. Sort of a "jitter" of certain horizontal rows. If I switch to a
> console (which is running at the exact same resolution/bit depth) I don't
> see the flicker (I suppose it's possible that the flicker _only happens in
> between lines of text, but that seems quite unlikely). Switching back to
> X the flicker comes right back. Rebooting generally fixes the problem,
> but that's quite annoying.
>
> Since it boots up to xdm (my debian install did that by default for some
> reason) killing the X server is a little more tricky that just hitting
> ctl-alt-backspace so I haven't actually tried restarting the X server to
> see if that remedies the problem (although I will try next time the
> problem occurs). Has anyone else seen this problem, and if so, any ideas
> as to why it happens, and how to fix or avoid it?
>
> ------------------ Peter Amstutz --------------------
> -------------- [EMAIL PROTECTED] -------------
> ------- http://www-unix.oit.umass.edu/~tetron -------
> -----------------------------------------------------
--
Regards,
Declan Moriarty.
