How to overheat an r100 w/o really trying...

Alex Deucher alexdeucher at
Thu Mar 17 14:10:14 PDT 2011

On Thu, Mar 17, 2011 at 4:58 PM, James Cloos <cloos at> wrote:
> [I still use my old laptop with its r100-based 7500 (1002:4c57)
> for my primary X server.  All of the clients (including the wm)
> run on a tower; the laptop only runs the X server.  The cpu is
> set to powersave; only the r100 gets hot enough to engage fans.]
> The recipe is easy:
>    run ftview (from freetype2) on a large font
>    hold down a key to scroll through all of the glyphs
> Something like:
>    :; ftview 33 /usr/share/fonts/unfonts/UnDotum.ttf
>    h (once)
>    f10 (hold it down and let it autorepeat)
> It only takes about one second for the r100 to heat enough to, by
> convection, heat the cpu enough to trip the cpu’s emergency mode.
> After that, only power cycling the laptop will restore normal ops.
> (The tcp traffic from doing that is approx 70Mbs client→server.)

Make sure the vents and fans are clear of dust and debris and that the
heat sink is making good contact with the asic.


> -JimC
> --
> James Cloos <cloos at>         OpenPGP: 1024D/ED7DAEA6
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