linux-kernel - Re: [Bug 10345] USB HID problems after resume

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Message-ID: <47EFF4F6.1050302@rtr.ca>
Date:	Sun, 30 Mar 2008 16:15:50 -0400
From:	Mark Lord <lkml@....ca>
To:	Pavel Machek <pavel@....cz>
Cc:	bugme-daemon@...zilla.kernel.org, rjw@...k.pl, bunk@...nel.org,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	linux-usb@...r.kernel.org
Subject: Re: [Bug 10345] USB HID problems after resume

Pavel Machek wrote:
> 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?
..

This is a 32-bit system / kernel, so I'm guessing that this option is not applicable.

Right?  (it does have 3GB of RAM, though).

Cheers
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