FIFO underruns

[t s <keinbiervorvier@xxxxxxxxx>]

Hi,

recently I started seeing occasional short screen flicker to black associated with dmesg entries

[  583.020853] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO underrun
[13512.114363] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO underrun
[56208.248545] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO underrun
[67175.515783] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO underrun
[77229.530199] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe B FIFO underrun
[88350.137618] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO underrun

This happens less than once per day on average and only on the monitor with the active pointer in a dual monitor setup. Because it is so rare, I have not done a git-bisect.

I'm running stock Fedora 24, with latest Fedora kernel update, however due to problems with the glamor driver shipped with Fedora I use the xf86-video-intel driver

Here is the graphics card info:

# lspci -vvv -s 00:02.0
00:02.0 VGA compatible controller: Intel Corporation HD Graphics 530 (rev 06) (prog-if 00 [VGA controller])
        Subsystem: ASUSTeK Computer Inc. Device 8694
        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 136
        Region 0: Memory at de000000 (64-bit, non-prefetchable) [size=16M]
        Region 2: Memory at c0000000 (64-bit, prefetchable) [size=256M]
        Region 4: I/O ports at f000 [size=64]
        [virtual] Expansion ROM at 000c0000 [disabled] [size=128K]
        Capabilities: [40] Vendor Specific Information: Len=0c <?>
        Capabilities: [70] Express (v2) Root Complex Integrated Endpoint, MSI 00
                DevCap: MaxPayload 128 bytes, PhantFunc 0
                        ExtTag- RBE+
                DevCtl: Report errors: Correctable- Non-Fatal- Fatal- Unsupported-
                        RlxdOrd- ExtTag- PhantFunc- AuxPwr- NoSnoop-
                        MaxPayload 128 bytes, MaxReadReq 128 bytes
                DevSta: CorrErr- UncorrErr- FatalErr- UnsuppReq- AuxPwr- TransPend-
                DevCap2: Completion Timeout: Not Supported, TimeoutDis-, LTR-, OBFF Not Supported
                DevCtl2: Completion Timeout: 50us to 50ms, TimeoutDis-, LTR-, OBFF Disabled
        Capabilities: [ac] MSI: Enable+ Count=1/1 Maskable- 64bit-
                Address: fee0100c  Data: 41c2
        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: [100 v1] Process Address Space ID (PASID)
                PASIDCap: Exec+ Priv-, Max PASID Width: 14
                PASIDCtl: Enable- Exec- Priv-
        Capabilities: [200 v1] Address Translation Service (ATS)
                ATSCap: Invalidate Queue Depth: 00
                ATSCtl: Enable-, Smallest Translation Unit: 00
        Capabilities: [300 v1] Page Request Interface (PRI)
                PRICtl: Enable- Reset-
                PRISta: RF- UPRGI- Stopped-
                Page Request Capacity: 00008000, Page Request Allocation: 00000000
        Kernel driver in use: i915
        Kernel modules: i915

and relevant output from Xorg.0.log

[    18.496] (==) Matched intel as autoconfigured driver 0
[    18.496] (==) Matched intel as autoconfigured driver 1
[    18.496] (II) LoadModule: "intel"
[    18.496] (II) Loading /usr/lib64/xorg/modules/drivers/intel_drv.so
[    18.502] (II) Module intel: vendor="X.Org Foundation"
[    18.505] (II) intel: Driver for Intel(R) Integrated Graphics Chipsets:
[    18.506] (II) intel: Driver for Intel(R) HD Graphics: 2000-6000
[    18.506] (II) intel: Driver for Intel(R) Iris(TM) Graphics: 5100, 6100
[    18.506] (II) intel: Driver for Intel(R) Iris(TM) Pro Graphics: 5200, 6200, P6300
[    18.507] (II) intel(0): Using Kernel Mode Setting driver: i915, version 1.6.0 20160425
[    18.507] (II) intel(0): SNA compiled from 2.99.917-698-g71d3273
[    18.509] (--) intel(0): gen9 engineering sample
[    18.509] (--) intel(0): CPU: x86-64, sse2, sse3, ssse3, sse4.1, sse4.2, avx, avx2; using a maximum of 4 threads
[    18.509] (II) intel(0): Creating default Display subsection in Screen section

The CPU is a Intel(R) Core(TM) i7-6700K CPU @ 4.00GHz


$ uname -a
Linux ...... 4.7.2-201.fc24.x86_64 #1 SMP Fri Aug 26 15:58:40 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux

I know that this is not the latest general kernel, but I wonder if this is a known problem and what can be done about it.

Best Regards

Thorsten Schwander

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