Unfortunately, this is one of the problems with AGP. Certain chip/bridge combinations only only work reliably at certain speeds. Most AGP bridges are busted in one way or another. We've been through this several times in the radeon driver (what to pick for default AGP mode).
Unfortunately, this is one of the problems with AGP. Certain chip/bridge combinations only only work reliably at certain speeds. Most AGP bridges are busted in one way or another. We've been through this several times in the radeon driver (what to pick for default AGP mode).