Hi,
* Roy Gillotti gillottir@gmail.com [160919 09:14]:
What Kernel are you using? I've upgraded to the letux 4.8 RC5 via aTc's repo update and noticed this behavior with my bench supply capable of delivering 4A.
Sorry for the delay in responding. I'm just using typically either current mainline Linux or current Linux next.
5V power supply, two copies of dd=if/dev/urandom of=/dev/null running, hangs within a minute with temperatures below 68C. The power is actually 4.5V in this case. Just before hang I might get this on omap5-uevm:
hub 1-2:1.0: over-current condition
12V power supply, two copies of dd=if/dev/urandom of=/dev/null running, does not hang even with temperatures over 90C.
Also did a test with a bench power supply set to 5V. Two copies of dd=if/dev/urandom of=/dev/null running and it is stable. Lowering it to about 4.6V during the test makes it hang.
Then I also booted with a bench power supply set to 4.8V, started two copies of dd=if/dev/urandom of=/dev/null, and the blue LEDs near the power jack get dimmer and got "hub 1-2:1.0: over-current condition". This time it did not hang and after killing one of the dd processes stays running. Curiously after one hub over-current message two copies of dd kept running just fine at v4.8V.. Until I did rmmod ehci-omap as I'm using an initramfs.
Finally tried 4.8V, rmmod ehci-omap in initramfs, two copies of dd=if/dev/urandom of=/dev/null, and it seems to be running OK.
So yeah I must have moved my omap5-uevm from 12V to 5V rack shelf and that's why I started noticing hangs. And it seems something on the *hci bus is sucking power quite a bit, maybe the Ethernet?
And thanks for the detailed test log info :)
Regards,
Tony