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

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Message-ID: <20080330202047.GE11839@elf.ucw.cz>
Date:	Sun, 30 Mar 2008 22:20:47 +0200
From:	Pavel Machek <pavel@....cz>
To:	Mark Lord <lkml@....ca>
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

On Sun 2008-03-30 16:15:50, Mark Lord wrote:
> 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).

Not 100% sure... I've seen strangeness on 32-bit systems, too. Can you
simply pass mem=2G and see what happens?
									Pavel
-- 
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(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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