<html> <head> <base href="https://bugs.freedesktop.org/"> </head> <body> <div> <a class="bz_bug_link bz_status_NEEDINFO " title="NEEDINFO - FIFO underrun, visual glitches and instability with dual monitors" href="https://bugs.freedesktop.org/show_bug.cgi?id=109376#c14">Comment # 14</a> on <a class="bz_bug_link bz_status_NEEDINFO " title="NEEDINFO - FIFO underrun, visual glitches and instability with dual monitors" href="https://bugs.freedesktop.org/show_bug.cgi?id=109376">bug 109376</a> from <a class="email" href="mailto:lakshminarayana.vudum@intel.com" title="Lakshmi <lakshminarayana.vudum@intel.com>"> Lakshmi</a> <pre>(In reply to Ville Syrjala from <a href="show_bug.cgi?id=109376#c7">comment #7</a>) > 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 affected. 4.18 is a lost cause since it's no longer maintained, but we might 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 <a class="bz_bug_link bz_status_CLOSED bz_closed" title="CLOSED FIXED - [WHL] FIFO underruns on a hybrid machine but only while on "performance" (dGPU) mode" href="show_bug.cgi?id=109248">bug 109248</a> 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 <a href="show_bug.cgi?id=109376#c13">comment #13</a>) > 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?</pre> </div> <hr> You are receiving this mail because: <ul> <li>You are on the CC list for the bug.</li> <li>You are the assignee for the bug.</li> <li>You are the QA Contact for the bug.</li> </ul> </body> </html>