Hi @huangjj27,
can you disable the GPU (graphics card) you don’t want to use in BIOS?. 
havn’t tried yet. I’m afraid it will make my computer not work again as the windows 10 does
Surely it is a simple case of enable or disable the GPU, if it doesn’t work, just reset your BIOS to the factory default!. 
I turned on the UMA graphics mode, and it did disable my discrete graphics. However, it isn’t what I want.
how to get both cards work as in windows? just wait for the support from open source drivers?
When you disabled your on-board GPU, did Ubuntu then use your peripheral GPU? If it did then you can indeed have both cards work now, depending on whether you have the on-board one enabled or not. Obviously, you can’t have both of them operating simultaneously in a given session. However, they wouldn’t be able to operate simultaneously in MS Windows either.
Furthermore, by disabling your on-board GPU in the BIOS, thus allowing your peripheral GPU to work, this suggests that disabling your on-board GPU via blacklisting at the OS level would also work. Possibly via a nice, easy one-click bash script. Thus, you could possibly choose between the different GPUs by invoking thia script and then re-logging in.
why neither in MS? the prosperity drivers can make them render the screen at the same time with each rendering half of the screen, which is known as cross-fire. that’s what I want.
It would have helped if you had made it clear, from the start, that you wanted to use both GPUs simultaneously in one session. All of the advice given thus far, has not taken this into account and so, in fact, has been a bit of a waste of time for both yourself and the ones giving the advice. I will now take a look on the forums to see if what you want is possible.
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Since I am not acquainted with “Crossfire” I will not attempt to provide direct advice here. But, I have found a couple of links on it on Ubuntu forum threads to get you started:
https://ubuntuforums.org/showthread.php?t=2254477
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HI @huangjj27,
I must second @stevecook172001’s quote above as you failed to mention your end goal in the thread starter!. Please elaborate more as to what exactyl it is you want if Steve’s links don’t help you at all!.
See also:
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thx
sorry that I didn’t make my question clear…
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thx you all for help!
if I could not solve my problem from the advice you given, I will start another clearer thread.
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