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

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Message-ID: <47F00173.40106@rtr.ca>
Date:	Sun, 30 Mar 2008 17:09:07 -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.

Mark Lord wrote:
> 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.
..

And booting with iommu=soft is worse:  video comes back with bizarre timings
after suspend/resume -- totally unsynced display afterwards.

Cheers
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