[clug] Odd Problem

[Martijn van Oosterhout]

On Sun, May 29, 2005 at 08:39:48PM +1000, Paul Matthews wrote:
> G'Day All,
> 
> Now this odd problem has been bothering me for quite some time, but I
> cannot seem to resove it.

Well, check a few simple things:

1. Does /proc/interrupts show any conflict
2. What about the using_dma and unmaskirq settings on the drives (hdparm)
3. types of hardware/memory/video card in your computer

It seems to me you are causing a small lockup, like you said, and the
only way I know to do that is leaving unmaskirq off on a hard
disk/cdrom. Or some conflict somewhere...

Hope this helps,

> Let's say I am copying files off (or to) a DVD, and reading a web page
> at the same time. If I scroll the web page (either via the mouse wheel,
> the keyboard or the scroll bars), the file reading/writting on the DVD
> will fail.
> 
> If there is no CD in the drive and I do the same thing the light, on the
> DVD will flash. This also seems to cause a slight lockup with the machine.
> 
> This is the most repeatable way to cause the problem the occur. But it
> also happens if I am playing Enemy Territory.
> 
> /var/log/messages has the following occasionally:
>   hdc: lost interrupt
> 
> I have tried the following
> * changed mouse protocol (I thought it was just the mouse wheel at first)
> * moved the DVD to its own IDE channel
> * updated the video drivers (nvidia)
> * turned DMA off on the DVD
> 
> But all to no avail. Anyone have any suggestions where to look next?
> 
> SuSE9.3Pro 2.6.11.4-20a-default AMD
-- 
Martijn van Oosterhout   <kleptog at svana.org>   http://svana.org/kleptog/
> Patent. n. Genius is 5% inspiration and 95% perspiration. A patent is a
> tool for doing 5% of the work and then sitting around waiting for someone
> else to do the other 95% so you can sue them.
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