When the GMX2000 card idles and blanks the display it appears to simply mangle the image - I get a sort of missynched display. When it wakes up it goes dark properly and you have to switch to text and back to get the display back again.
Alan, is this problem still present in XFree86 in RHL 9? If so, it'd be a good idea to report it in XFree86's bugzilla at http://bugs.xfree86.org so that Alan Hourihane and/or whomever else maintains the driver and has the hardware and/or docs can investigate it. Since these drivers don't get many changes from release to release, I'll most likely be spending some time eventually backporting newer driver fixes back to 4.2.1 and possibly 4.1.0 too as time permits.
Just looked through upstream bugzilla and didn't see this issue anywhere so UPSTREAM resolution is not right as there's no upstream report. ;o) The driver seems unmaintained nowadays, and there's not much likelyhood of us fixing it ourselves without the hardware and associated hardware knowledge, so I'm closing this WONTFIX. If a fix comes in a new X release sometime in the future, it can possibly be backported though.
I still maintain the driver, but unfortunately my GMX2000 card died so I can't test anymore.
One of the pitfalls of keeping hardware support going I suppose. ;o/ I don't have any 3Dlabs hardware myself or I'd send some to you, however I'll keep my eyes peeled. Sometimes someone pokes into IRC or email with a problem, and they're willing to give away a card to developers to help keep them supported. If anything turns up, I'll see if I can get you some cards. Alan C. trawls ebay occasionally for cards too and gets lucky sometimes. ;o) Thanks Alan H.