[DragonFlyBSD - Bug #3107] ACPI interrupt storm when loading i915 on Lenovo T460

[bugtracker-admin at leaf.dragonflybsd.org]

Issue #3107 has been updated by calicant.



I was able to load i915 in console without errors and no acpi GPE storm by roughly removing:


         Method (_L66, 0, NotSerialized)  // _Lxx: Level-Triggered GPE, xx=0x00-0xFF
         {
             If (\_SB.PCI0.GFX0.GSSE (\_SB.PCI0.GFX0.GSCI ())){}
             Else
             {
                 \_SB.PCI0.SMBU.CPSC = 0x01
             }
         }

from dsdt.dsl.

Unfortunately this caused a page fault panic when starting X.


Luca


----------------------------------------
Bug #3107: ACPI interrupt storm when loading i915 on Lenovo T460
http://bugs.dragonflybsd.org/issues/3107#change-13843

* Author: oyvinht
* Status: New
* Priority: Normal
* Assignee: 
* Category: ACPI
* Target version: 5.0.0
----------------------------------------

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 at 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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