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

[bugzilla-daemon at freedesktop.org]

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

--- Comment #14 from Lakshmi <lakshminarayana.vudum at intel.com> ---
(In reply to Ville Syrjala from comment #7)
> We seem to have fixed the original issue so I'm tempted to just close this
> bug.
> 
> However it might be interesting to know whether 4.19 and 4.20 are also
> affected. 4.18 is a lost cause since it's no longer maintained, but we might
> want to backport some of the fixes to 4.19 and 4.20. Can you test with
> 4.19/4.20?
> 
> In relation to bug 109248 Canonical identified commit ff43bc379e16
> ("drm/i915: Move ddb/wm programming into plane update/disable hooks on
> skl+") as fixing their flickering screen problems. We might be after the
> same thing here.

(In reply to Hin-Tak Leung from comment #13)
> I have a 97MB gz'ed kernel log... is there a place I could upload it? 
> 
> That's partly because I still have "drm.debug=0x1e log_buf_len=4M" on.
> 
> # grep FIFO kern.log
> Mar  5 11:07:44 hintak-System-Product-Name kernel: [ 2669.215740]
> [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe B FIFO
> underrun
> Mar  5 12:41:22 hintak-System-Product-Name kernel: [ 8287.823276]
> [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO
> underrun
> Mar  5 12:41:22 hintak-System-Product-Name kernel: [ 8287.823298]
> [drm:intel_fbc_underrun_work_fn [i915]] Disabling FBC due to FIFO underrun.
> Mar  6 10:38:10 hintak-System-Product-Name kernel: [87298.948144]
> [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe B FIFO
> underrun
> Mar  6 14:41:16 hintak-System-Product-Name kernel: [101885.855603]
> [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe B FIFO
> underrun
> 
> grep -E '(Mar  5 1|Mar  5 2|Mar  6 0|Mar  6 1)' kern.log | gzip -c >
> kern.log-subset.gz

Any results from kernel 4.19?

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