Comment 196 for bug 1283589

Created attachment 131151
process rather than discard events in acpi_ec_clear

Hi all,

If you have a machine that was (previously) affected by this bug, could you please take the time to try a new patch for this issue?

A user with an older Samsung machine found that the earlier patch introduced some issues for them, so this is a new patch designed to be a better solution to the problem.

Currently the new patch has only been tested on 2 affected machines (to my knowledge), so I would be very grateful if anyone else can test this patch (especially users with Samsung series 5 or 7 machines).

You will need to use a recent kernel source like 3. (one which includes the earlier acpi_ec_clear patch), or otherwise apply the previous patch first:

https://github.com/torvalds/linux/commit/ad332c8a45330d170bb38b95209de449b31cd1b4.patch

Then apply the attachment ec_process_stale_events.patch

Please test to see if your lid closing / suspending / etc. still work as intended with this patch.

This new patch also provides some debug information after every resume/boot which will show up in dmesg something like:

[ 1192.208056] ACPI : EC: acpi_ec_clear: EC_SC 0x28
[ 1192.217844] ACPI : EC: acpi_ec_clear: EC_SC 0x28
[ 1192.218844] ACPI : EC: acpi_ec_clear: EC_SC 0x28
[ 1192.222835] ACPI : EC: acpi_ec_clear: EC_SC 0x28
[ 1192.223834] ACPI : EC: acpi_ec_clear: EC_SC 0x28
[ 1192.224833] ACPI : EC: acpi_ec_clear: EC_SC 0x28
[ 1192.227833] ACPI : EC: acpi_ec_clear: EC_SC 0x28
[ 1192.228834] ACPI : EC: acpi_ec_clear: EC_SC 0x28
[ 1192.229832] ACPI : EC: acpi_ec_clear: EC_SC 0x28
[ 1192.230828] ACPI : EC: 8 stale EC events cleared

Please report if you get any EC_SC bytes here _other than_ 0x28. I only get 0x28 on my machine but I am very interested to know if other affected machines produce something else.

If you test it, please also report your system's product code, e.g.:

# dmidecode -s system-product-name
900X3F
# dmidecode -s baseboard-product-name
NP900X3F-K01AU

Many thanks,
Kieran