http://bugzilla.kernel.org/show_bug.cgi?id=13689
Summary: ACPI: EC: input buffer is not empty, aborting
transaction
Product: ACPI
Version: 2.5
Kernel Version: 2.6.27.23-0.1-pae
Platform: All
OS/Version: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: EC
AssignedTo: acpi...@kernel-bugs.osdl.org
ReportedBy: haag_nor...@gmx.de
Regression: No
Hi
on my new Dell Studio 1555 I got the following issue:
On a fresh boot I'm able to change brightness via brightnesskeys and ac-adapter
is detected properly, but as soon as the following error appears:
ACPI: EC: input buffer is not empty, aborting transaction
brightness control is no longer possible. Even the detection whether an
ac-adapter or not is attached fails.
I found that commenting the "goto end;" in ec.c (see below) workarounds this
problem. It may be something similar like the MSI Force-Polling. Maybe you
could find some better fix for that issue (I'm not that kernel-specialist at
all :) )
Best Regards
Norman Haag
static int acpi_ec_transaction(struct acpi_ec *ec, struct transaction *t,
int force_poll)
{
int status;
u32 glk;
if (!ec || (!t) || (t->wlen && !t->wdata) || (t->rlen && !t->rdata))
return -EINVAL;
if (t->rdata)
memset(t->rdata, 0, t->rlen);
mutex_lock(&ec->lock);
if (ec->global_lock) {
status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk);
if (ACPI_FAILURE(status)) {
status = -ENODEV;
goto unlock;
}
}
if (ec_wait_ibf0(ec)) {
pr_err(PREFIX "input buffer is not empty, "
"aborting transaction--\n");
status = -ETIME;
//goto end;
}
status = acpi_ec_transaction_unlocked(ec, t, force_poll);
end:
if (ec->global_lock)
acpi_release_global_lock(glk);
unlock:
mutex_unlock(&ec->lock);
return status;
}
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