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...
