R4400 250

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R4400 250

Unread postby Shtoink » Mon Feb 24, 2003 8:34 am

I found this bit of info in the newsgroups as well, it seemed worth spreading this tidbit around since I know a few of you guys here have the very same processor that this bug is present in.

the 250mhz cpu has a known defect in which it freezes up and emits a
loud hideous screech until you move the mouse, touch a key, etc. you can
google in these groups for info and stories.

it only occurs on the 250mhz 2mb cache indigo2 cpu however. your issue
must be different, can you explain it in any more detail or give background
on what is going on when it happens.

Not trying to rehash anything, I just hope this maybe helps a few people out of some potential confusion.

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Unread postby dexter1 » Mon Feb 24, 2003 11:22 am

Indeed shtoink, this info is not well known in the SGI community.

Just the 250MHz R4400 (in an indigo2) seems to be affected by this peculiar bug. Looks like when the machine is idling (screensaver?) it will produce a loud buzzing noise from the speaker until you activate the machine again. CPU/system goes flat in that period. I have seen a few postings about how people were expimenting with hardware/software to work around this. Nobody was succesful.
The only remedy is to avoid 250 MHz Indigo's and go for 200 MHz instead.
It could be that a CPU with fewer cache (1 MB) is not affected by this, don't know if such a CPU exists...

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Unread postby Pulsar » Mon Feb 24, 2003 11:42 am

didn't happen on a friend indigo 2 while in screen saver mode
he never had this bug ,it perhaps on some 250 not all models

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Unread postby akimmet » Mon Feb 24, 2003 1:51 pm

I've heard of this problem before, and someone has made an experimental fix. It involved keeping both the cpu and network interface busy, because the bug could only be triggered when either were idle.

All 250MHz 2Mb cache modules are affected, however it is sometimes very hard to trigger on some configurations.

XMMS is the most common program to cause the problem, along with some other mp3 players.
Last edited by akimmet on Tue Feb 25, 2003 5:54 am, edited 1 time in total.

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Unread postby nekonoko » Mon Feb 24, 2003 3:57 pm

Hmmm ... that reminds me, I've noticed on my Indigo2 (R10K/195 MI w/texture) I can hear a chirping noise from the machine when using 3D graphics (3D screensavers, moving objects in a Maya, etc). It doesn't carry over on the audio subsystem; I have headphones plugged in and they are absolutely clean. It could be coming from the front speaker though, it's hard to tell.
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Unread postby directedition » Mon Feb 24, 2003 4:59 pm

I have a solution: Remove the system speaker.

If the speedometer in your car is broken, remove that too.
- Jim
:Indigo: :Indigo: :Indy: :Indy: <- signed by The Screensavers :) :Indigo2IMP: (230L) (230L) :540: :1600SW: :1600SW: <- touchscreen :PI: :Octane2:

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Unread postby Shtoink » Tue Feb 25, 2003 9:29 pm

directedition wrote:I have a solution: Remove the system speaker.

If the speedometer in your car is broken, remove that too.

That's a little excessive, I just plugged in my speaker system to the back and it souds great.

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