On Sun, Mar 06, 2005 at 05:38:05PM -0800, Mark Vojkovich wrote: >On Sun, 6 Mar 2005, Greg Stark wrote: > >> Mark Vojkovich <mvojkovi@xxxxxxxxxxx> writes: >> >> > That sounds like a driver issue. You might want to look through >> > the cvs history for suspicious changes. This one looks suspicious: >> > >> > http://cvsweb.xfree86.org/cvsweb/xc/programs/Xserver/hw/xfree86/drivers/mga/mga_video.c.diff?r1=1.35&r2=1.36&sortby=date >> > >> > The description says: >> > >> > 85. Fix for Xv resolution loss problem with Matrox cards (Michael Lampe). >> > >> > but, if I recall correctly, some of the resolution loss issues >> > with Matrox cards were because the video scaler didn't have enough >> > bandwidth to display the full resolution. Reclaiming the resolution >> > in bandwidth challenging situations probably results in fifo underflows >> > which, at least on the NVIDIA cards that I'm familiar with, would >> > produce results like you are describing. >> >> I don't follow that at all. What do you mean by "resolution loss" and >> "reclaiming the resolution"? > > I don't remember the details because it was a long time ago, but >back when I wrote the original MGA Xv support, I recall the driver >using a lower-bandwidth mode where the chroma was subsampled in some >way. I assume, but am not positive, that the mentioned patch is undoing >that. There has been some back and forth on this over the years. The most recent changes are from a little over a year ago, and were covered in the following thread on the devel list: http://www.mail-archive.com/devel%40xfree86.org/msg05974.html I think we need more information on which versions work for given hardware, starting with single-headed, single server cases for reference. David _______________________________________________ XFree86 mailing list XFree86@xxxxxxxxxxx http://XFree86.Org/mailman/listinfo/xfree86
