[Bug 99578] [SKL][bisected] Screen regularly returns from power save mode

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=99578

--- Comment #16 from Patrick Steinhardt <ps at pks.im> ---
Just a short reminder, triggered by the different userspace assertion: the
second, external GPU is not in use and stubbed out with vfio-pci.

Anyway, finally got around to do these tests. No change in behavior, the bug
constistently triggered after around 2 two three minutes for all three
configurations (without i915.enable_dc and with i915.enable_dc=0 respectively
i915.enable_dc=-1). dmesg shows no significant differences, diff (output is
sorted to minimize diff, so this is not in chronological order):

```
--- /dev/fd/63  2017-02-23 13:06:04.456398971 +0100
+++ /dev/fd/62  2017-02-23 13:06:04.456398971 +0100
@@ -104,8 +104,8 @@
  ACPI: SSDT 0x0000000066B8E598 0006FD (v02 INTEL  xh_rvp08 00000000 INTL
20120913)
  ACPI: SSDT 0x0000000066B8EC98 0052EA (v02 SaSsdt SaSsdt   00003000 INTL
20120913)
  ACPI: SSDT 0x0000000066B93FD0 000E58 (v02 CpuRef CpuSsdt  00003000 INTL
20120913)
- ACPI: SSDT 0xFFFF88047368B800 0005AA (v02 PmRef  ApIst    00003000 INTL
20120913)
- ACPI: SSDT 0xFFFF88047368F000 000705 (v02 PmRef  Cpu0Ist  00003000 INTL
20120913)
+ ACPI: SSDT 0xFFFF8804736BA000 0005AA (v02 PmRef  ApIst    00003000 INTL
20120913)
+ ACPI: SSDT 0xFFFF8804736BD000 000705 (v02 PmRef  Cpu0Ist  00003000 INTL
20120913)
  ACPI: (supports S0 S3 S5)
  ACPI: UEFI 0x0000000066B93F88 000042 (v01                 00000000     
00000000)
  ACPI: Using IOAPIC for interrupt routing
@@ -351,7 +351,7 @@
  iommu: Adding device 0000:04:00.0 to group 13
  io scheduler cfq registered (default)
  io scheduler noop registered
- Kernel command line: BOOT_IMAGE=/linux/gentoo/bzImage
init=/usr/sbin/epoch-init vfio-pci.ids=10de:1380,10de:0fbc i915.enable_dc=0
+ Kernel command line: BOOT_IMAGE=/linux/gentoo/bzImage
init=/usr/sbin/epoch-init vfio-pci.ids=10de:1380,10de:0fbc i915.enable_dc=-1
  Last level dTLB entries: 4KB 64, 2MB 0, 4MB 0, 1GB 4
  Last level iTLB entries: 4KB 128, 2MB 8, 4MB 8
  libata version 3.00 loaded.
@@ -587,7 +587,7 @@
  rtc_cmos 00:03: alarms up to one month, y3k, 242 bytes nvram, hpet irqs
  rtc_cmos 00:03: RTC can wake from S4
  rtc_cmos 00:03: rtc core: registered rtc_cmos as rtc0
- rtc_cmos 00:03: setting system clock to 2017-02-23 11:54:15 UTC (1487850855)
+ rtc_cmos 00:03: setting system clock to 2017-02-23 11:58:27 UTC (1487851107)
  scsi 0:0:0:0: CD-ROM            HL-DT-ST BD-RE  BH16NS55  1.02 PQ: 0 ANSI: 5
  scsi 2:0:0:0: Direct-Access     ATA      Samsung SSD 840  CB6Q PQ: 0 ANSI: 5
  scsi 3:0:0:0: Direct-Access     ATA      SAMSUNG HD103UJ  1118 PQ: 0 ANSI: 5
@@ -631,7 +631,7 @@
  smpboot: Allowing 4 CPUs, 0 hotplug CPUs
  smpboot: CPU0: Intel(R) Core(TM) i5-6600K CPU @ 3.50GHz (family: 0x6, model:
0x5e, stepping: 0x3)
  smpboot: Max logical packages: 1
- smpboot: Total of 4 processors activated (28046.20 BogoMIPS)
+ smpboot: Total of 4 processors activated (28046.15 BogoMIPS)
  smp: Bringing up secondary CPUs ...
  smp: Brought up 1 node, 4 CPUs
  snd_hda_codec_realtek hdaudioC0D0: autoconfig for ALC892: line_outs=3
(0x14/0x15/0x16/0x0/0x0) type:line
@@ -714,7 +714,7 @@
  udevd[122]: specified group 'uucp' unknown
  udevd[122]: specified group 'video' unknown
  udevd[251]: starting version 3.1.5
- udevd: 49 output lines suppressed due to ratelimiting
+ udevd: 48 output lines suppressed due to ratelimiting
  UDP hash table entries: 8192 (order: 6, 262144 bytes)
  UDP-Lite hash table entries: 8192 (order: 6, 262144 bytes)
  Unpacking initramfs...
```

Anyway, attaching all three dmesg logs

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