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

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Message-ID: <20080330182243.GA11839@elf.ucw.cz>
Date:	Sun, 30 Mar 2008 20:22:43 +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 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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