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I am using a Geforce GTX 570. I tried installing the nvidia drivers (331) which work on Ubuntu but they seem to break Deepin. I would like to be able to play video games with up-to-date graphics. What drivers should I use?
For modern games, you are probably going to want the nvidia drivers. I am not sure why they would break Deepin; there is no reason that I can think of for Deepin to treat the drivers any differently than Ubuntu would.
You could try to use the nouveau drivers (these are free drivers for your nvidia card) but from what I understand, Steam requires you to use the Nvidia drivers. If that's the case, then you have two choices: you need to either figure out what the Nvidia driver is breaking in Deepin, and fix it, so that you can play games on Deepin. Or you can switch back to a distro that lets you use the Nvidia drivers so that you can play games.
It's one or the other. I would say that serious gaming is a pretty volatile activity on a computer, so to some degree it does limit your options a bit. There is just too much proprietary code floating around out there, and it all requires some pretty specific environments. When I built a gaming rig, I stuck pretty closely to Steam's specifications, and never updated anything. It all Just Worked, but it was a little more limiting than what one might be used to with Linux.
How do find out what video driver is being used?
In the system settings there isn't any tab for selecting hardware drivers as far as I can see.
Very impressed with Deepin 2014 so far except that it isn't the snapiest distro I have used by a long way!
I've nover heard of QML being incompatible with Nvidia drivers, but I'm assuming they mean something very specific within Deepin that happens to use QML.
If that really is the case, they should probably make that very clear somewhere on their site or even in the distribution itself, because that is a pretty uncommon thing to have happen.
We have made a statement on: http://planet.linuxdeepin.com/archives/7656 (if you cann't see, please switch the language into English), which is a technical problem on design and difficult to explain simply. We will solve this problem as soon as possible, please wait.