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Dual GPU on Ubuntu

 
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Mildew
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PostPosted: Thu Jul 21, 2011 11:51 am    Post subject: Dual GPU on Ubuntu Reply with quote

I got a new GPU for one of the Linux boxes.
Since the MB is a dual PCI-X thingie, I thought I might keep the old GPU in the second slot.
However, Ubuntu does not automatically detect the two GPUs, but only the one in the primary slot.
Anyone know if it is possible to run dual GPUs on Ubuntu when the GPUs are not of the same type?
One is a HD5570 and the other is a HD5770.

#ni-1
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Gemjunkie
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PostPosted: Thu Jul 21, 2011 12:57 pm    Post subject: Reply with quote

Is there a monitor or dummy load on the second card to make the OS activate it?

(I'm just a Linux newbie, but it seems as though it would work similar to Win in this regard)


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Mildew
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PostPosted: Fri Jul 22, 2011 11:31 am    Post subject: Reply with quote

Ah, I was not aware that the card needed load to be detected.

Oh well, it's just a 5570, so it's not like it's worth bying a monitor to keep it running. I'll just toss it instead.

Thanks for the help anyway! #ni-1
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Gemjunkie
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PostPosted: Fri Jul 22, 2011 12:06 pm    Post subject: Reply with quote

You can make a dongle. It's just a plug found on the end of a VGA cable with a few resistors soldered on to draw enough current to fool the OS into thinking there's a monitor attached. Hang on, I'll post a link to instructions here when I find them again.


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Mildew
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PostPosted: Fri Jul 22, 2011 1:31 pm    Post subject: Reply with quote

Yes, I did some searching and found this.

However, I also found a forum post stating that these should not be necessary on a Linux system.

Then I realized that I am a complete MORON!
So I started Catalyst control center, activated the secondary adapter, and that's it... Rolling Eyes Embarassed

Oh well, my excuse is that I've never used a dual GPU setup before.

But now I'm rockin' a 5570 and a 5770 in the same shrubber! Cool

#ni-1
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stooper101
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PostPosted: Fri Jul 22, 2011 2:52 pm    Post subject: Reply with quote

Just out of curiosity, what projects have an ATI app for Linux?
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PostPosted: Fri Jul 22, 2011 3:09 pm    Post subject: Reply with quote

Congrats on getting it running so quickly.





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Mildew
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PostPosted: Sat Jul 23, 2011 6:06 am    Post subject: Reply with quote

stooper101 wrote:
Just out of curiosity, what projects have an ATI app for Linux?


Collatz, DNET and Mooooooooo!!!!

Ok, so DNET and Moo is pretty much the same project, but still counts as two projects in BoincStats Wink

There is also Primegrid, but I've never got it to run without using 100% of one CPU core in addition to the GPU, so I'm not running that one anymore.

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