Two display anomalies (one still open)
Bob Chiodini
rchiodin at bellsouth.net
Fri Sep 9 11:51:04 UTC 2005
On Fri, 2005-09-09 at 05:59 -0400, Matthew Saltzman wrote:
> On Thu, 8 Sep 2005, Bob Chiodini wrote:
>
> > On Wed, 2005-09-07 at 20:16 -0400, Matthew Saltzman wrote:
> >> If you are following this thread, there are updates on both issues below.
> >>
> >> Thanks for your suggestions so far. Keep 'em coming!
> >>
> >> On Wed, 7 Sep 2005, Matthew Saltzman wrote:
> >>
> >>> 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:
> >> [...]
> >>>
> >>> 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.
> >>
> >> Haven't tested yet, but I did find out that the vert. refresh rate in XP
> >> is 60Hz. It appears from the logs to also be 60Hz in X, but I changed
> >> xorg.conf anyway. That does not appear to affect the problem on my
> >> externa monitor. I will check the projector with a brand new cable
> >> tomorrow.
>
> Capping the vert refresh rate at 60Hz in xorg.conf had no effect. In
> fact, it looks like 60Hz was the rate even before that change.
>
> Brand new, high quality video cable had no effect.
>
> Still stuck. Audience still dizzy.
>
> >>
> >> Forgot to note that the problem occurs in a virtual console as well as in
> >> X.
> >>
> >
> > Matthew,
> >
> > The virtual terminal here is 720x400, 31.4 Khz horiz. and 70 Hz vert. I
> > would have expected 640x480 @ 60Hz. Try lowering the resolution in X.
> > That may not be ideal, but it may yield a clue.
>
> I use the radeonfb module, so I'm not sure what the VC specs are. How did
> you get that info?
>
> >
> > Good luck with a new cable.
>
> Thanks. Wish I had better news.
>
> >
> >
Matthew,
Maybe you could have the audience shift side-to-side at the same rate as
the distortion ;-) Seriously, sorry to hear no success.
I got the VT frequencies from the "info" menu item on my monitor.
What resolution are you using for X?
Does removing video=radeonfb from the kernel command line make any
difference?
You could also try the VESA driver in X.
Bob...
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