[Bug 98994] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO underrun

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=98994

            Bug ID: 98994
           Summary: [drm:intel_cpu_fifo_underrun_irq_handler [i915]]
                    *ERROR* CPU pipe A FIFO underrun
           Product: Mesa
           Version: 12.0
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/DRI/i965
          Assignee: intel-3d-bugs at lists.freedesktop.org
          Reporter: funfunctor at folklore1984.net
        QA Contact: intel-3d-bugs at lists.freedesktop.org

While using wayland I noticed, on occasion, a graphic glitch can occur that
coincides with a FIFO underrun.

[drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO
underrun

* dmesg =>

$ dmesg | grep drm
[    1.329195] [drm] Initialized drm 1.1.0 20060810
[    1.610304] [drm] Memory usable by graphics device = 4096M
[    1.610305] [drm] Replacing VGA console driver
[    1.616356] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
[    1.616358] [drm] Driver supports precise vblank timestamp query.
[    1.633922] [drm] Initialized i915 1.6.0 20160711 for 0000:00:02.0 on minor
0
[    1.689550] [drm:intel_dp_start_link_train [i915]] *ERROR* failed to train
DP, aborting
[    1.749704] [drm:intel_dp_start_link_train [i915]] *ERROR* failed to train
DP, aborting
[    1.986602] fbcon: inteldrmfb (fb0) is primary device
[    2.973124] i915 0000:00:02.0: fb0: inteldrmfb frame buffer device
[14588.214453] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU
pipe A FIFO underrun

* lspci + pci config space of the device on 02.0 =>

00:02.0 VGA compatible controller: Intel Corporation HD Graphics 5500 (rev 09)
(prog-if 00 [VGA controller])
        Subsystem: Lenovo Device 5034
        Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr-
Stepping- SERR- FastB2B- DisINTx+
        Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort- <TAbort-
<MAbort- >SERR- <PERR- INTx-
        Latency: 0
        Interrupt: pin A routed to IRQ 46
        Region 0: Memory at f0000000 (64-bit, non-prefetchable) [size=16M]
        Region 2: Memory at e0000000 (64-bit, prefetchable) [size=256M]
        Region 4: I/O ports at 3000 [size=64]
        [virtual] Expansion ROM at 000c0000 [disabled] [size=128K]
        Capabilities: [90] MSI: Enable+ Count=1/1 Maskable- 64bit-
                Address: fee00018  Data: 0000
        Capabilities: [d0] Power Management version 2
                Flags: PMEClk- DSI+ D1- D2- AuxCurrent=0mA
PME(D0-,D1-,D2-,D3hot-,D3cold-)
                Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-
        Capabilities: [a4] PCI Advanced Features
                AFCap: TP+ FLR+
                AFCtrl: FLR-
                AFStatus: TP-
        Kernel driver in use: i915
        Kernel modules: i915
00: 86 80 16 16 07 04 90 00 09 00 00 03 00 00 00 00
10: 04 00 00 f0 00 00 00 00 0c 00 00 e0 00 00 00 00
20: 01 30 00 00 00 00 00 00 00 00 00 00 aa 17 34 50
30: 00 00 00 00 90 00 00 00 00 00 00 00 0b 01 00 00
40: 09 00 0c 01 99 61 04 72 d4 00 5d 14 00 00 00 00
50: c1 01 00 00 31 00 00 00 00 00 00 00 01 00 00 ce
60: 00 00 01 00 00 00 00 00 00 00 00 00 00 00 00 00
70: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
90: 05 d0 01 00 18 00 e0 fe 00 00 00 00 00 00 00 00
a0: 00 00 00 00 13 00 06 03 00 00 00 00 00 00 00 00
b0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
c0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
d0: 01 a4 22 00 00 00 00 00 00 00 00 00 00 00 00 00
e0: 00 00 00 00 00 00 00 00 00 80 00 00 00 00 00 00
f0: 00 00 00 00 00 00 00 00 00 00 09 00 18 50 d6 cc


* useful version info =>

* 4.8.10-300.fc25.x86_64
* OpenGL renderer string: Mesa DRI Intel(R) HD Graphics 5500 (Broadwell GT2)
  OpenGL core profile version string: 4.3 (Core Profile) Mesa 12.0.3

Kindest Regards,
Edward.

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