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Date: Wed, 11 Apr 2012 08:59:11 +0200
From: magnum <>
Subject: Re: JtR:Multi-GPU Setups

On 04/11/2012 05:27 AM, Solar Designer wrote:
>> and use 'ssh -X' (X11 protocol enabled in sshd)
> Not confirmed.  Moreover, if this command is used when connecting from a
> remote machine, it will prevent things from working because our program
> (such as JtR) will be talking to the remote machine's X server instead
> of to the one with the AMD GPU in it.  In my testing today, when
> connecting from a remote machine, simple "ssh" works, "ssh -X" does not
> (the AMD GPU is not seen with "clinfo" and "john --platform=list", then).

Same experience here, no X forwarding - or unset DISPLAY.

> Yes, when I ran X with an AMD-only xorg.conf (no Nvidia driver
> explicitly mentioned there), somehow I was also getting the free nouveau
> driver loaded (along with fglrx).  This prevented me from loading the
> proprietary nvidia driver later (and somehow the nouveau driver would
> refuse to be rmmod'ed because of what looked like a circular dependency
> between nouveau-related modules).  So I added "blacklist nouveau" to
> /etc/modprobe.d/blacklist.conf, which prevented this annoyance.

I've had to to the same. In fact, both Ubuntu 11.x and Mint 12 crash for
me on several machines with GTX580 when merely trying to boot the liveCD
/ installer unless I add the kernel boot option "nouveau.blacklist=yes".


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