[clug] Re: linux Digest, Vol 29, Issue 29

[chris]

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
>>    
>>
If reinstalling udev and makedev packages doesn't cause you any 
side-effect, it might be worth trying.

Chris