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I have a (pretty old now) Radeon 4870 which I'm using in my windows 8 box. Its using the WDDM (1.1) drivers.
When I have a full screen app open on my primary monitor anything running on the secondary display lags badly. For example I cant play a game on my primary and watch a video on my secondary monitor. When running a non-fullscreen app on my primary there is no issue with my secondary.
Has anyone else had similar issues with WDDM/windows 8? Is this something that will be fixed by a graphics card upgrade?
Not loved
Posted 2012-09-26T14:33:29.777
Reputation: 131
1Could be related to the fact that AMD dropped official support for the Radeon HD4000 series and earlier, and will only be providing security and big-dollar-customer-mandated bugfixes going forward. I'm surprised WDDM 1.1 drivers work at all, since WDDM 1.2 was introduced in Windows 8. That could definitely have something to do with it. – allquixotic – 2012-09-26T14:35:56.453
1In essence, there will never be an official "Windows 8" (WDDM 1.2) driver for the HD4000 series. Ever. Windows may be able to operate in backwards compatibility mode for WDDM 1.1, but when things fall back to less preferred interfaces, you're going to run into performance problems exactly like this. I severely doubt that anything short of an update to a more recent graphics card generation would fix this. The drivers for HD5000 and newer generations are completely different on Windows 8, because they provide a proper WDDM 1.2 interface and take advantage of newer hardware features. – allquixotic – 2012-09-26T14:36:50.850
@allquixotic ok cool I didn't realise wddm 1.1 was second class in 8 I think what you have here is the answer – Not loved – 2012-09-26T19:34:10.327