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Bug #3107

open

ACPI interrupt storm when loading i915 on Lenovo T460

Added by oyvinht over 4 years ago. Updated almost 2 years ago.

Status:
New
Priority:
Low
Assignee:
-
Category:
ACPI
Target version:
Start date:
12/03/2017
Due date:
% Done:

0%

Estimated time:

Description

This is on a Lenovo T460 (firmware r06uj56d)

root# uname -a
DragonFly slaptop 5.1-DEVELOPMENT DragonFly v5.1.0.381.ge8ac90-DEVELOPMENT #10: Mon Dec 4 07:52:28 CET 2017 root@slaptop:/usr/obj/usr/src/sys/SLAPTOP x86_64

After doing:

root# kldload i915

the systems gets very slow, and looking at vmstat I see interrupts from acpi0 increasing by 2000-5000 every second (using kern.livelock_lowater=1000 and kern.livelock_limit=2000 makes the system usable again):

root# vmstat -i
interrupt                    total       rate
acpi0 1681307 1925

FWIW I have tested enabling DDB and INVARIANTS in the kernel, and built /sys/dev/acpica with ACPI_DEBUG=1, which fills the kernel message buffer with messages like:

evgpe-0634 EvGpeDetect           : Read registers for GPE 60-67: Status=40, Enable=46, RunEnable=46, WakeEnable=00
evgpe-0607 EvGpeDetect : Ignore disabled registers for GPE 68-6F: RunEnable=00, WakeEnable=00
evgpe-0607 EvGpeDetect : Ignore disabled registers for GPE 70-77: RunEnable=00, WakeEnable=00
evgpe-0607 EvGpeDetect : Ignore disabled registers for GPE 78-7F: RunEnable=00, WakeEnable=00
evevent-0361 EvFixedEventDetect : Fixed Event Block: Enable 00000120 Status 00000001
evgpe-0607 EvGpeDetect : Ignore disabled registers for GPE 00-07: RunEnable=00, WakeEnable=00
evgpe-0607 EvGpeDetect : Ignore disabled registers for GPE 08-0F: RunEnable=00, WakeEnable=00
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