<html> <head> <base href="https://bugs.freedesktop.org/"> </head> <body> <div> <a class="bz_bug_link bz_status_NEW " title="NEW - [SKL] [regression] Random display flickering on Kernel 4.8 with dual-screen" href="https://bugs.freedesktop.org/show_bug.cgi?id=97450#c15">Comment # 15</a> on <a class="bz_bug_link bz_status_NEW " title="NEW - [SKL] [regression] Random display flickering on Kernel 4.8 with dual-screen" href="https://bugs.freedesktop.org/show_bug.cgi?id=97450">bug 97450</a> from <a class="email" href="mailto:yingted+freedesktop@gmail.com" title="Ted <yingted+freedesktop@gmail.com>"> Ted</a> <pre>I also started experiencing this issue. I've seen most of the issues mentioned, plus the computer would sometimes freeze (screen is black and caps lock light does not toggle). After applying the patch, I haven't had any problems yet (freezing, black screen, flickering). $ lspci | grep VGA 00:02.0 VGA compatible controller: Intel Corporation HD Graphics 520 (rev 07) $ dmesg -l err -w [ 3221.487848] [drm:intel_pipe_update_end [i915]] *ERROR* Atomic update failure on pipe A (start=87034 end=87035) time 301 us, min 763, max 767, scanline start 753, end 768 [ 4236.060368] tpm tpm0: A TPM error (325) occurred stopping the TPM [ 4236.322922] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe B FIFO underrun [ 9858.626083] tpm tpm0: A TPM error (325) occurred stopping the TPM [ 9858.915548] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe B FIFO underrun [ 9875.987934] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO underrun [10794.506952] tpm tpm0: A TPM error (325) occurred stopping the TPM [10794.779128] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe B FIFO underrun [10826.831623] tpm tpm0: A TPM error (325) occurred stopping the TPM [10827.114490] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe B FIFO underrun [10862.320313] tpm tpm0: A TPM error (325) occurred stopping the TPM [10867.941723] snd_hda_intel 0000:00:1f.3: azx_get_response timeout, switching to single_cmd mode: last cmd=0x206f0900 [10867.980104] snd_hda_codec_hdmi hdaudioC0D2: Unable to sync register 0x2f0d00. -5 [10868.176508] snd_hda_codec_realtek hdaudioC0D0: out of range cmd 0:20:400:ffffffff [10868.195635] snd_hda_codec_realtek hdaudioC0D0: Unable to sync register 0x2b8000. -5 [10868.195769] snd_hda_codec_realtek hdaudioC0D0: Unable to sync register 0x2b8000. -5 [10869.673593] snd_hda_codec_realtek hdaudioC0D0: out of range cmd 0:20:400:ffffffff [10909.607243] tpm tpm0: A TPM error (325) occurred stopping the TPM [10909.892588] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe B FIFO underrun [10943.200346] tpm tpm0: A TPM error (325) occurred stopping the TPM [10943.475999] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe B FIFO underrun [10958.114510] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe B FIFO underrun [10982.525656] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe B FIFO underrun [11002.254512] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe B FIFO underrun [11025.533533] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe B FIFO underrun [11054.397515] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe B FIFO underrun [11071.691503] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe B FIFO underrun [11346.956583] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO underrun The pipe underruns happen generally when I plug/unplug a monitor and/or move a mouse across monitor boundaries.</pre> </div> <hr> You are receiving this mail because: <ul> <li>You are the QA Contact for the bug.</li> <li>You are on the CC list for the bug.</li> <li>You are the assignee for the bug.</li> </ul> </body> </html>