Subject: Re: DVD burning still have problems
From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: Jens Axboe <axboe@suse.de>
Cc: Alessandro Suardi <alessandro.suardi@gmail.com>,
       Volker Armin Hemmann <volker.armin.hemmann@tu-clausthal.de>,
       Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
In-Reply-To: <20050124204529.GA19242@suse.de>
References: <200501232126.55191.volker.armin.hemmann@tu-clausthal.de>
	 <5a4c581d050123125967a65cd7@mail.gmail.com> <20050124150755.GH2707@suse.de>
	 <1106594023.6154.89.camel@localhost.localdomain>
	 <20050124204529.GA19242@suse.de>
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On Llu, 2005-01-24 at 20:45, Jens Axboe wrote:
> > I've got several reports like this that only happen with ACPI, and one
> > user whose burns report fine but are corrupted if ACPI is allowed to do
> > power manglement.
> 
> Really weird, I cannot begin to explain that. Perhaps the two reporters
> in this thread can try it as well?

I can sort of guess - the CPU frequency changes (either from ACPI or
perhaps also from cpuspeed if in use ?) involve the CPU disconnecting
from the bus and reconnecting. There is much magic involved in this and
there are certainly chipset and CPU errata in this area.

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