linux-kernel - Re: 2.6.25-rc7: Ugh.

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Date:	Sun, 30 Mar 2008 17:04:25 -0400
From:	Mark Lord <lkml@....ca>
To:	Pavel Machek <pavel@...e.cz>
Cc:	Linux Kernel <linux-kernel@...r.kernel.org>,
	Greg KH <gregkh@...e.de>,
	Andrew Morton <akpm@...ux-foundation.org>, jikos@...e.cz
Subject: Re: 2.6.25-rc7:  Ugh.

Pavel Machek wrote:
> Hi!
> 
>>> It is with great reluctance when I attempt moving my main "desktop"
>>> over to a new kernel version -- because the USB subsystem seems to
>>> break every single time.
>>>
>>> So today I tried 2.6.25-rc7 on it for the first time.
>>> Not good.
>>>
>>> It boots, but just a simple suspend/resume (RAM) was enough to kill it.
>>> It comes back on resume, with an X desktop again,
>>> but with no USB functionality -- no mouse.
>>>
>>> The keyboard still works, so I dropped to a console and tried:
>>>
>>>   rmmod usbhid
>>>   insmod usbhid
>>>
>>> And the console hung at 100% CPU on the insmod.
>>> Back to 2.6.24.3 again, for now -- I've got work to do.
>>>
>>> The specs of this machine have been posted with great regularity
>>> in the past, every new kernel revision it seems.   So here we go again:
>>>
>>> Dell Inspiron 9400 notebook, Intel Core2Duo T7400, 2GB SDRAM.
>> ..
>>
>> Correction there:  3GB of RAM, not 2.
> 
> 3GB of RAM can be a problem. Try iommu=soft. .. but in such case
> rmmod/insmod of usbhid would not help...
..

Booted with mem=2GB, and USB hung again on the first suspend/resume cycle.

-ml
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