[Bug 94337] Linux 4.5 regression: FIFO underruns on Skylake

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=94337

--- Comment #8 from Drunkard Zhang <gongfan193 at gmail.com> ---
I'm using MSI GS60 with latest mainline kernel, still hitting this bug:

Sep 03 12:06:25 mylap kernel: [drm:intel_cpu_fifo_underrun_irq_handler [i915]]
*ERROR* CPU pipe A FIFO underrun

Extra info in case you need:

# uname -a
Linux mylap 4.8.0-rc3+ #85 SMP PREEMPT Thu Aug 25 17:20:53 CST 2016 x86_64
Intel(R) Core(TM) i7-6700HQ CPU @ 2.60GHz GenuineIntel GNU/Linux

# lspci
00:00.0 Host bridge: Intel Corporation Skylake Host Bridge/DRAM Registers (rev
07)
00:01.0 PCI bridge: Intel Corporation Skylake PCIe Controller (x16) (rev 07)
00:02.0 VGA compatible controller: Intel Corporation HD Graphics 530 (rev 06)
00:14.0 USB controller: Intel Corporation Sunrise Point-H USB 3.0 xHCI
Controller (rev 31)
00:14.2 Signal processing controller: Intel Corporation Sunrise Point-H Thermal
subsystem (rev 31)
00:16.0 Communication controller: Intel Corporation Sunrise Point-H CSME HECI
#1 (rev 31)
00:17.0 SATA controller: Intel Corporation Sunrise Point-H SATA Controller
[AHCI mode] (rev 31)
00:1c.0 PCI bridge: Intel Corporation Sunrise Point-H PCI Express Root Port #1
(rev f1)
00:1c.2 PCI bridge: Intel Corporation Sunrise Point-H PCI Express Root Port #3
(rev f1)
00:1c.3 PCI bridge: Intel Corporation Sunrise Point-H PCI Express Root Port #4
(rev f1)
00:1c.4 PCI bridge: Intel Corporation Sunrise Point-H PCI Express Root Port #5
(rev f1)
00:1d.0 PCI bridge: Intel Corporation Sunrise Point-H PCI Express Root Port #9
(rev f1)
00:1f.0 ISA bridge: Intel Corporation Sunrise Point-H LPC Controller (rev 31)
00:1f.2 Memory controller: Intel Corporation Sunrise Point-H PMC (rev 31)
00:1f.3 Audio device: Intel Corporation Sunrise Point-H HD Audio (rev 31)
00:1f.4 SMBus: Intel Corporation Sunrise Point-H SMBus (rev 31)
01:00.0 3D controller: NVIDIA Corporation GM107M [GeForce GTX 960M] (rev a2)
02:00.0 Network controller: Qualcomm Atheros QCA6174 802.11ac Wireless Network
Adapter (rev 20)
03:00.0 Unassigned class [ff00]: Realtek Semiconductor Co., Ltd. RTS5249 PCI
Express Card Reader (rev 01)
04:00.0 Ethernet controller: Qualcomm Atheros Killer E2400 Gigabit Ethernet
Controller (rev 10)
3e:00.0 Non-Volatile memory controller: Toshiba America Info Systems Device
010f (rev 01)

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