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ATI RADEON vertical refresh problem (60Hz)
I bought an ATI Radeon 7500 PCI last week (64MB DDR). The card is very fast
(quite a boost for my old PII 400MHz), but I had a *huge* problem: the card didn't allow me to select vertical refresh rates higher than 60Hz. The documentation says that I should disable the TV-out feature if I want higher refresh rates, but no matter if I disconnected the TV or not, I was only allowed to use 60Hz. Furthermore, the docs say that I can specify the maximum refresh rate in the "Screens-Advanced" tab (in the advanced display properties), but there's no field to specify refresh rates, just some buttons to select the vertical and horizontal polarity ("+", "-", "composite"). I hacked together a MyMonitor.inf file that specifies 90Hz as both minimum and maximum, but the card simply refuses to use anything else than 60Hz. I thought it's a bug and so I downloaded the newest drivers available (the ones on the CD were dated 2002). Guess what? That didn't fix anything. I used another monitor (a small 14" Pulsar PnP, lost somewhere in the basement), and everything worked. I was able to go as high as 85Hz in 800x600. But with the non-PnP monitor, I only got 60Hz. Then I started hacking around in the registry. Countless times I changed every occurence of "60" into "90". Still nothing. Yesterday I was about to return the card, but I decided to search the registry for one last time. I was lucky. The entry: IDCRegOptionDontUseOSMonitorInfo in HKEY_LOCAL_MACHINE/Software/ATI Technologies/Driver/0000/DAL/ is by default set to: 01 00 00 00 After I changed it to: 00 00 00 00 everything worked as it should. I now have a nice large 1152x864 display running at 85Hz. So, if everyone else had the same problems, give this one a try, it might help. To ATI: You are soooooo lame! Not the whole world uses PnP monitors. Better start supporting your customers. |
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