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Author Topic: Ubuntu Natty stuck at blank screen before login screen on 6 GPU (HD5850)  (Read 2078 times)
polymorpher
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July 27, 2011, 09:51:04 AM
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Everything was good with my dual 5850 until I added 4 more. Ubuntu Natty simply stuck at a blank screen (without internet connection) after the logo "Ubuntu" is loaded. I tried the following (through recovery mode):

1. Reinstall the driver: tried auto install from Ubuntu, and from the package downloaded from ATI website. Also tried manual install.
2. aticonfig --initial -f --adapter=all
3. aticonfig --initial -f --adapter=0,1,2,3,4,5
4. In /etc/X11/xorg.conf ServerLayout section, change "RightOf ...screen...1", "RightOf ...screen...2..." .... to "RightOf ...screen...0..." and other layouts (also tried set resolution to 800x600)
5. In /etc/X11/xorg.conf ServerLayout section, change "RightOf..." to 0 0

None of them work, I couldn't enter login screen unless I run "aticonfig --initial -f" which only enables the first device. It doesn't solve the problem.
Of course, all cards can be detected by aticonfig (aticonfig --list-adapters), and atiflash in MS-DOS.

GPU-Z can detect all 6 GPUs on Windows.
Motherboard: GA890FXA-UD7

I think a small change in xorg.conf should be able to fix this - for the moment, I am trying to increase the number of adapters one by one. But it seems Ubuntu couldn't even start with only 2 adapters (aticonfig --initial -f --adapters=0,1)

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drgr33n
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July 27, 2011, 10:03:16 AM
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IRQ error are my guess ? I've had this a few times and had to add a few flags to my boot configuration.

pci=acpi or acpi=noirq
polymorpher
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July 27, 2011, 10:16:59 AM
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Doesn't work. Since it works with 2 cards, I suspect one of the PCI-E x16 extension cable is defective.

Testing them one by one.
polymorpher
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July 27, 2011, 10:27:24 AM
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Boot successfully with 3rd card, but get temperature failed only on third card (flashed back to default BIOS), weird.
polymorpher
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July 27, 2011, 11:54:49 AM
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Got it working with 4 cards but with 5th/6th card plugged in the problem persists. I will just try linuxcoin.
polymorpher
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July 27, 2011, 12:58:16 PM
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Now with six cards it boots into scary white vertical lines, how fun is that
polymorpher
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July 27, 2011, 02:09:05 PM
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Now, problem solved - just as I predicted, the problem was my Ubuntu was 32-bit! They should really add some documentation on this, most likely to be a design problem in kernel, not ATI's fault.
plastic.elastic
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August 02, 2011, 04:32:36 PM
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Just curious, did you use dummy plugs?

Also did you try Linuxcoin instead?

Thanks

Tips gladly accepted: 1LPaxHPvpzN3FbaGBaZShov3EFafxJDG42
polymorpher
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August 05, 2011, 12:18:10 AM
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Just curious, did you use dummy plugs?

Also did you try Linuxcoin instead?

Thanks


No. I can't find anyone to sell me 50~150Ohm resistor in the city I live.
I didn't try Linuxcoin. After all, Linuxcoin is still Linux.
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