[Bug 109376] New: FIFO underrun, visual glitches and instability with dual monitors

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=109376

            Bug ID: 109376
           Summary: FIFO underrun, visual glitches and instability with
                    dual monitors
           Product: xorg
           Version: 7.7 (2012.06)
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/intel
          Assignee: chris at chris-wilson.co.uk
          Reporter: htl10 at users.sourceforge.net
        QA Contact: intel-gfx-bugs at lists.freedesktop.org

Created attachment 143139
  --> https://bugs.freedesktop.org/attachment.cgi?id=143139&action=edit
screenshot of visual glitches on the HDMI-connected montor

Here is a screenshot of visual glitches on waking the screens (pressing the esc
key).

This seems to be accompanied by

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

in dmesg.

There also seems to be general instability with a dual monitor set-up. We have
4 computers with identical hardware, except one is only hooked up with single
monitor (VGA port) for a while. Have had screen-lock ups every few days on all
dual-monitor set-ups.

0:02.0 VGA compatible controller: Intel Corporation Device 3e92 (prog-if 00
[VGA controller])
        Subsystem: ASUSTeK Computer Inc. Device 8694
        Flags: bus master, fast devsel, latency 0, IRQ 125
        Memory at a0000000 (64-bit, non-prefetchable) [size=16M]
        Memory at 90000000 (64-bit, prefetchable) [size=256M]
        I/O ports at 4000 [size=64]
        [virtual] Expansion ROM at 000c0000 [disabled] [size=128K]
        Capabilities: [40] Vendor Specific Information: Len=0c <?>
        Capabilities: [70] Express Root Complex Integrated Endpoint, MSI 00
        Capabilities: [ac] MSI: Enable+ Count=1/1 Maskable- 64bit-
        Capabilities: [d0] Power Management version 2
        Capabilities: [100] Process Address Space ID (PASID)
        Capabilities: [200] Address Translation Service (ATS)
        Capabilities: [300] Page Request Interface (PRI)
        Kernel driver in use: i915
        Kernel modules: i915

uname -a

... 4.18.0-13-generic #14-Ubuntu SMP Wed Dec 5 09:04:24 UTC 2018 x86_64 x86_64
x86_64 GNU/Linux


mesa:
18.2.2-0ubuntu1


libdrm_intel
2.4.95-1

intel_drv.so
2:2.99.917+git20171229-1ubuntu1


${HOME}/.local/share/xorg/Xorg.0.log seems to suggest that intel_drv.so is not
being used.

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