Date: Sun, 30 Mar 2008 20:22:43 +0200
From: Pavel Machek <pavel@ucw.cz>
To: Mark Lord <lkml@rtr.ca>
Cc: bugme-daemon@bugzilla.kernel.org, rjw@sisk.pl, bunk@kernel.org,
       Linux Kernel <linux-kernel@vger.kernel.org>, linux-usb@vger.kernel.org
Subject: Re: [Bug 10345] USB HID problems after resume
Message-ID: <20080330182243.GA11839@elf.ucw.cz>
References: <20080328223544.A61F711D10C@picon.linux-foundation.org> <47EE78C9.5090006@rtr.ca> <47EE793C.5070105@rtr.ca> <20080330114834.GA6510@elf.ucw.cz> <47EFD1F1.8010501@rtr.ca>
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On Sun 2008-03-30 13:46:25, Mark Lord wrote:
> Pavel Machek wrote:
>> On Sat 2008-03-29 13:15:40, Mark Lord wrote:
>> ..
>>> Just happened again.  The machine resumed from RAM with no functioning USB.
>>> Still running the exact same 2.6.25-rc7 kernel as before, with the RTC conflict fixed.
>>>
>>> WTF?
>>
>>> 3GB of RAM? Try iommu=soft.
> ..
>
> What does that option do (it is not in Documentation/kernel-parameters.txt),
> and why do you suspect it may make a difference here?

See x86_64/boot-options.txt . Yes, that should be fixed.

I had strange problems, and it looks like iommu does not have proper
suspend/resume support. > 3GB machines hit that. Do you have one?

									Pavel
-- 
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