On Thu, 10 Jan 2002 [EMAIL PROTECTED] wrote: > this is a reply to a post I found in the list archive at > http://www.xfree86.org/pipermail/newbie/2001-June/008045.html > ----- original post ----- > I've compiled XFree86 4.1.0 and installed and after that, I noticed > dots, > rain, or noise (whatever you want to call it) on the screen. Can someone > please tell me what is going on? > My system specs: > Motherboard PCChips M571, SVGA SiS 5598, Pentium 233, 64MB, and my > monitor > ----- original post end ----- > I have exactly the same problem, except that I am using XFree86 4.0.3 > (that comes with a distribution based on redhat 7.1) and GNOME. My > Hardware is a IBM Netvista A40, which uses the i810 intel chipset.
The problem in the initial case, on the PC Chips board, is that the VGA chip uses the shared memory at the wrong speed- causing the white-speckle effect. Reducing the clock of the chip (which is possible on this board, via a BIOS option) can make the problem go away. > The noise on the screen varies in intensity with different modes, in > 320x200 it is barely visible, in 1280x1024 it is unusable to the extend > that you cannot see anything at all anymore except vertical colored > lines (red-green-blue-red-green-blue) all over the screen. Well, higher resolutions and refresh-rates mean more RAM is accessed in a given time. > My *assumption* is that the shared video memory somehow gets > overwritten, but I have no idea what to do against it. Currently I try > to specify the "NoAccel" option in XF86Config, but it does not change > anything (or I'm doing something terribly wrong ...) Unlikely. Overwritten RAM would cause many other problems. I presume the i810 doesn't have a "VGA Frequency" setting in the BIOS setup, but you might also try some slightly more conservative memory settings. Have you got the correct grade of memory installed? Are you overclocking your CPU atall- higher FSBs may stretch the RAM to speckling point. Try more conservative RAM settings? Try choosing a more conservative video mode? Perhaps a lower refresh-rate will help. What about the DacSpeed setting? Look up the detected value in your log file, and try specifying a slightly lower value? You have got agp support enabled, haven't you?... -- Regards, [EMAIL PROTECTED] My website: http://www.iain.thomas.dial.pipex.com/ _______________________________________________ Newbie mailing list [EMAIL PROTECTED] *** To unsubscribe , or change message options, see: http://XFree86.Org/mailman/listinfo/newbie
