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Re: Off-Topic: G5 Open Firmware instability

Hi Tony!

On 5/13/22 01:11, tonyj@suse.de wrote:
> Right now it's running 3.0 Linux kernel.   It's overheating.  It will 
> boot into X11 and remain up pretty much indefinitely if the load 
> average remains under 1.5. If I start Firefox I'll get a spike 
> (log warnings from Windfarm that the temp is "overtemp" followed by 
> it returning to normal).  If I really load the machine (run a prime 
> factoring load test) i'll get a "critical" warning from Windfarm 
> followed by an immediate power off.  

There have been quite a lot of PowerPC- and G5-related fixes in newer
kernels as compared to 3.0, so I would suggest using a more recent

Do you know that we have current Debian unstable images for 32- and 64-bit
PowerPC available?

> https://cdimage.debian.org/cdimage/ports/snapshots/2022-03-28/

> Overheating is common and I'm aware of the process to try to fix it 
> but my concern is that the machine has also become totally unstable
> in Open Firmware (OF). 
> Initially OF was stable but I noticed that the machine had stopped 
> chiming at power on and in the course of trying the various fixes for 
> this OF has become totally unstable.
> (...)
> I've tested the RAM (4 sticks of PC2-4200) in a PC with MemTestx86+ 
> and they are fine.  I've also tried swapping in different RAM.
> I've tried all of the usual fixes,  remove CMOS battery, power off 
> for a day, clear NVRAM,  boot holding down power key to go thru
> programmers tone into OF.  This dinking is what made it worse :)

Sounds like bad capacitors [1] to me. Have you checked for any suspiciously
looking capacitors on the mainboard?


PS: We're colleagues, I also work at SUSE ;).

> [1] https://en.wikipedia.org/wiki/Capacitor_plague

 .''`.  John Paul Adrian Glaubitz
: :' :  Debian Developer
`. `'   Physicist
  `-    GPG: 62FF 8A75 84E0 2956 9546  0006 7426 3B37 F5B5 F913

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