Hi Iain, > -----Original Message----- > From: ext Iain Thomas [mailto:[EMAIL PROTECTED]]
> 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. Hm, I have to take a look at the BIOS. Alas, I've been there some times already (for other reasons), but I cannot recall such a setting... but my memory may be wrong. > > 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. That is correct. Interesting is, that the noise ... I should stop using the word noise as the failure is not spread uniformly over the screen, but are more horizontal bursts. Most interesting is, that if the PC does nothing and you don't do anything too, the screen is fine. But as soon as the PC (no idea if it's the CPU, memory transfers, disk i/o or something) starts working the distortion is worse as more load the PC has. > > My *assumption* is that the shared video memory somehow gets > > overwritten > > 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? In the PC itself or in XF86Config? In XF86Config I set it to 4Megs, but for the i810 the amount of video memory can vary. In the PC there are 512MB, which worked fine before under windows (I know this is not an argument that it should work under linux too :-) > Are you overclocking your CPU atall- higher FSBs may stretch > the RAM to speckling point. As long as IBM did not overclock the CPU it isn't. > Try more conservative RAM settings? I will try that :-) > Try choosing a more conservative video mode? Perhaps a lower > refresh-rate will help. an 8bpp mode is usable... but, you know, I cannot have a pc in my room and know that it is only working, but not optimal :-) > What about the DacSpeed setting? Look up the detected value in your log > file, and try specifying a slightly lower value? That is specified in XF86Config again, correct? I will try that too. > You have got agp support enabled, haven't you?... Yes, it's already in the kernel :-) otherwise the chipset won't work with X at all. Thanks for the numerous and promising hints! Andreas Ebbert Software Design Engineer - Nokia Networks OSS phone: +49-177-9413928, fax: +49-177-94123988 Heltorfer Stra�e 1, 40472 D�sseldorf, Germany _______________________________________________ Newbie mailing list [EMAIL PROTECTED] *** To unsubscribe , or change message options, see: http://XFree86.Org/mailman/listinfo/newbie
