Juan Manuel Cabo wrote:
On 02/27/2014 12:14 AM, Li Guang wrote:
oh, sorry, I'm referring internal EC firmware code
for Q event queuing, not ACPI SPEC, ;-)
for machine you tested, 8 is the queue size,
but for some unknown also nasty EC firmwares(let's suppose it exists),
it may queue more Q events.
and I saw several firmwares queued 32 events by default,
then, let's say, they be used for some samsung products,
and also they also forgot to deal with sleep/resume state,
then, we'll also leave stale Q event there.
Thanks!
We tested each on our different samsung models (intel, amd), and it
was 8 across. But you're right, there might be more in the future.
I even saw a bug report in ubuntu's launchpad of an HP with a similar
sounding problem, ( https://bugs.launchpad.net/ubuntu/+source/linux-source-2.6.20/+bug/89860 )
which I have no idea if it was caused by the same issue, but if in the future,
the flag ec_clear_on_resume is used to match other DMI's, it might
be a good idea to make the max iteration count bigger.
The only reason that there is a max iteration count, was to prevent
an unexpected case in which an unknown EC never returns 0 after
queue emptied. So far it hasn't been the case. Can we count on it?.
The loop currently does finish early when there are no more events.
I guess changing it 255 or 1000 would be enough, right?
can't imagine 1K bytes be dissipated on Q event,
EC's ram is usually expensive,
I think 255 is really enough. :-)
Thanks!
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