On Wed, Oct 29, 2003 at 04:54:34PM +0400, Nikita V. Youshchenko wrote: > After upgrading X from 4.2 to current 4.3 packages from XSF, (minor point: they're actually from Debian experimental) > I've got the following problem on several of workstations here. > > If X is started on 1280x1024 24bpp, there is well-visible and really > annoying "CGA snow" effect when some object moves over the screen. > (That means, to the right of the moving object there are lots of flickering > white dots and short horizontal lines). > > Option "XaaNoScreenToScreenCopy" takes the effect away, but desktop > becomes unacceptably slow. Other options (both Xaa-related and > DRI-related) seem not to change the effect. > > This effect disappears if X is started an lower bpp (16bpp). > > This happens with video card that lspci detects as "ATI Technologies > Inc Radeon RV200 QW [Radeon 7500]". XF86Config and XFree86 log files > are attached. > > In the past, I've noticed the same effect of a computer with S3 card, but I > thought that it could be hardware problem. In this case, it is definitly > driver problem, because earlier versions of X (e.g. 4.2) worked correctly. You are describing RAMDAC problems. This sort of thing happens when a RAMDAC gets overdriven (operating near or beyond its specifications), but can also happen, I think, when the RAMDAC code in a driver isn't quite right. My guess is that the latter is what is happening since you say 4.2.1 works fine. -- G. Branden Robinson | "To be is to do" -- Plato Debian GNU/Linux | "To do is to be" -- Aristotle branden@debian.org | "Do be do be do" -- Sinatra http://people.debian.org/~branden/ |
Attachment:
signature.asc
Description: Digital signature