https://bugzilla.kernel.org/show_bug.cgi?id=107191
Bug ID: 107191
Summary: Macbook ACPI EC boot stalls
Product: ACPI
Version: 2.5
Kernel Version: 4.3.0
Hardware: x86-64
OS: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: EC
Assignee: [email protected]
Reporter: [email protected]
Regression: No
Created attachment 192131
--> https://bugzilla.kernel.org/attachment.cgi?id=192131&action=edit
dmesg.bad.gz
It appears that the fix from bug #94651 was not sufficient to completely
prevent boot stalls caused by the ACPI EC.
I have captured dmesg (with ec.c DEBUG) from an example stall. The dmesg log is
annotated with the smb_hc_* calls from sbshc.c and with a stack trace at the
end of the stall. If you highlight "smb_hc" you will see the start of each
individual call in to the ec code.
The dmesg shows a smb_hc_write operation beginning at 0.377764 seconds which
causes a stall until 232.4 seconds.
Note that, to save space in the dmesg log, I only capture the first 100,000
lines of EC debug output (ec.c appears to be stuck in a loop outputting the
same repeated lines thousands of times per second).
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