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: > >>>>> (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. > > Looks like this morning was just a case of the ambient light obscuring the > flicker. It was back this afternoon, and setting the vertical refresh > rate to a max of 60 Hz seems to cure it. > > Auto-adjust works if it's done after logging in. If I do it at the login > screen, it might display anomalies. > > > > > 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. > > 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. Good luck with a new cable. Bob...
