On Fri, Aug 28, 2015, at 02:40 PM, Emanuel Evans wrote:

Apologies for the repeat posting--I think my previous posting ended up bouncing due to some misconfigured dmarc settings.

Your email actually got through successfully. I saved the thread in case anyone figured it out. (I regrettably can't solve your problem, however.)

On Fri, Aug 28, 2015 at 11:40:15AM -0700, Emanuel Evans wrote:

Apologies for the repeat posting--I think my previous posting ended up bouncing due to some misconfigured dmarc settings. Anyways, I have kind of a weird issue that I'm having trouble debugging. On my MacBook Pro (11,1), checking battery status (through acpi or the /sys filesystem) becomes extremely slow after the computer's been on for a while. Here's an example:

$ time cat /sys/class/power_supply/BAT0/status Charging

real 0m54.519s user 0m0.000s sys 0m4.663s

dmesg and journalctl aren't outputting anything during the call, and I tried strace during the command and there was no output during the blocked time. It's highly intermittent--acpi can take anywhere from 0-60 seconds with no discernible pattern, except that it doesn't happen when the battery is plugged in and charged. Any ideas for how to debug this further, or possible solutions? Thanks so much!

I'm experiencing the same issue on my MacBook Pro (10,2). AFAIK it is caused by the sbs kernel module so you might be better off asking on the kernel mailing list. There is also a relevant bug report [1]. [1] https://bugzilla.kernel.org/show_bug.cgi?id=94651

On Sat, Aug 29, 2015 at 07:55:25AM -0700, Emanuel Evans wrote:

Panayiotis Tembriotis writes:

...

I'm experiencing the same issue on my MacBook Pro (10,2). AFAIK it is caused by the sbs kernel module so you might be better off asking on the kernel mailing list. There is also a relevant bug report [1].

[1] https://bugzilla.kernel.org/show_bug.cgi?id=94651

Thanks so much for the pointer, I'll follow up there.

There is also a test for the SBS hang here [1], though I haven't tried it myself yet. [1] http://thread.gmane.org/gmane.linux.acpi.devel/74929/focus=75552