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<b><a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO - Screen shaking and blinking [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO underrun"
href="https://bugs.freedesktop.org/show_bug.cgi?id=102803#c20">Comment # 20</a>
on <a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO - Screen shaking and blinking [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO underrun"
href="https://bugs.freedesktop.org/show_bug.cgi?id=102803">bug 102803</a>
from <span class="vcard"><a class="email" href="mailto:mthode@mthode.org" title="Matthew Thode <mthode@mthode.org>"> <span class="fn">Matthew Thode</span></a>
</span></b>
<pre>reproduced with the following:
i915.enable_guc_loading=1 i915.enable_guc_submission=1 i915.semaphores=1
i915.nuclear_pageflip=1 i915.fastboot=1 i915.enable_gvt=0 i915.enable_rc6=1
drm.debug=0x1e log_buf_len=1M
Log output didn't seem to have anything interesting. Just
intel_plane_atomic_calc_changes and drm_atomic_set_fb_for_plane operations
(nothing else in dmesg)
That looked mostly like this.
[38820.637551] [drm:intel_plane_atomic_calc_changes] [CRTC:36:pipe A] has
[PLANE:33:cursor A] with fb 85
[38820.637559] [drm:intel_plane_atomic_calc_changes] [PLANE:33:cursor A]
visible 1 -> 1, off 0, on 0, ms 0
[38820.644862] [drm:drm_atomic_set_fb_for_plane] Set [FB:85] for plane state
ffff8d02164af600
Here's the active module params.
/sys/module/i915/parameters/alpha_support : N
/sys/module/i915/parameters/disable_display : N
/sys/module/i915/parameters/disable_power_well : 1
/sys/module/i915/parameters/edp_vswing : 0
/sys/module/i915/parameters/enable_cmd_parser : Y
/sys/module/i915/parameters/enable_dc : -1
/sys/module/i915/parameters/enable_dpcd_backlight : N
/sys/module/i915/parameters/enable_dp_mst : Y
/sys/module/i915/parameters/enable_execlists : 1
/sys/module/i915/parameters/enable_fbc : 1
/sys/module/i915/parameters/enable_guc_loading : 1
/sys/module/i915/parameters/enable_guc_submission : 1
/sys/module/i915/parameters/enable_gvt : N
/sys/module/i915/parameters/enable_hangcheck : Y
/sys/module/i915/parameters/enable_ips : 1
/sys/module/i915/parameters/enable_ppgtt : 3
/sys/module/i915/parameters/enable_psr : 0
/sys/module/i915/parameters/enable_rc6 : 1
/sys/module/i915/parameters/error_capture : Y
/sys/module/i915/parameters/fastboot : Y
/sys/module/i915/parameters/force_reset_modeset_test : N
/sys/module/i915/parameters/guc_firmware_path : (null)
/sys/module/i915/parameters/guc_log_level : -1
/sys/module/i915/parameters/huc_firmware_path : (null)
/sys/module/i915/parameters/inject_load_failure : 0
/sys/module/i915/parameters/invert_brightness : 0
/sys/module/i915/parameters/load_detect_test : N
/sys/module/i915/parameters/lvds_channel_mode : 0
/sys/module/i915/parameters/lvds_use_ssc : -1
/sys/module/i915/parameters/mmio_debug : 0
/sys/module/i915/parameters/modeset : -1
/sys/module/i915/parameters/nuclear_pageflip : Y
/sys/module/i915/parameters/panel_ignore_lid : 1
/sys/module/i915/parameters/prefault_disable : N
/sys/module/i915/parameters/reset : 2
/sys/module/i915/parameters/semaphores : 0
/sys/module/i915/parameters/use_mmio_flip : 0
/sys/module/i915/parameters/vbt_firmware : (null)
/sys/module/i915/parameters/vbt_sdvo_panel_type : -1
/sys/module/i915/parameters/verbose_state_checks : Y
guc firmware is i915/kbl_guc_ver9_14.bin (9_39 isn't autoloading, but is
available), huc firmware is also loaded i915/kbl_huc_ver02_00_1810.bin.
Anything else I can provide</pre>
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