linux-kernel - Re: 2.6.22 regression: thermal trip points

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Message-ID: <20070802140442.62c56dbd@the-village.bc.nu>
Date:	Thu, 2 Aug 2007 14:04:42 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	Andi Kleen <andi@...stfloor.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Knut Petersen <Knut_Petersen@...nline.de>,
	linux-kernel@...r.kernel.org, trenn@...e.de, pavel@....cz,
	mjg59@...f.ucam.org, lenb@...nel.org
Subject: Re: 2.6.22 regression: thermal trip points

> > Set a taint flag, 
> That's hardly any useful if the machine is dead afterwards.

It won't be the hardware will do a failsafe shutdown first.

> You'll just end up with "Linux destroyed my laptop" headlines all 
> over the internet and rightfully very annoyed users.

You have to systematically sit down and tweak your machine.

> The philosophy didn't include physically destroying hardware
> as far as I know.

It most certainly did. With safety checks you could override.

> > As root you can erase the bios, 
> We don't ship the devbios driver for good reasons.

Thats debatably a bad reason (the user space API is wrong thats all), and
one thats totally inconsistent with some of the other drivers we do ship.

> > lock the hard disk with a random
> > password, reflash your video card .... 
> 
> That all requires significant effort and custom software. It's not that we 
> have a one liner echo destroy > /sys/.../flash-bios. 

Well you can do the hard disk one in one line of perl, the video card one
in a small bit of C. And this merely makes the argument that raising the
trip points should be harder.

Alan
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