[Bug 105604] [CI][KBL only] igt@* - dmesg-warn - *ERROR* CPU pipe [A|B] FIFO underrun

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=105604

--- Comment #12 from Marijan <marijan.matic at zg.t-com.hr> ---

Running on Fedora 30, Kernel 5.2.9, HP Elitebook 840 G5, Using 2 external
monitors on DP (tried also 1xVGA + 1DP, same issue).
Same issue on Ubuntu 18.04.

Result - PC Hangs, hw reboot required.

Here are the logs of last moments:

Jul 31 15:13:03 localhost.localdomain kernel:
[drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe B FIFO
underrun
Jul 31 15:13:03 localhost.localdomain kernel: [drm:intel_mst_enable_dp [i915]]
*ERROR* Timed out waiting for ACT sent
Jul 31 15:13:03 localhost.localdomain kernel: [drm:pipe_config_err [i915]]
*ERROR* mismatch in pixel_rate (expected 148500, found 296999)
Jul 31 15:13:03 localhost.localdomain kernel: [drm:pipe_config_err [i915]]
*ERROR* mismatch in shared_dpll (expected 000000001275aaee, found
000000004520f932)
Jul 31 15:13:03 localhost.localdomain kernel: [drm:pipe_config_err [i915]]
*ERROR* mismatch in dpll_hw_state.ctrl1 (expected 0x00000003, found 0x00000001)
Jul 31 15:13:03 localhost.localdomain kernel: [drm:pipe_config_err [i915]]
*ERROR* mismatch in base.adjusted_mode.crtc_clock (expected 148500, found
296999)
Jul 31 15:13:03 localhost.localdomain kernel: [drm:pipe_config_err [i915]]
*ERROR* mismatch in port_clock (expected 270000, found 540000)
[drm:intel_ddi_prepare_link_retrain [i915]] *ERROR* Timeout waiting for DDI BUF
C idle bit
Jul 31 15:13:18 localhost.localdomain kernel:
[drm:intel_ddi_prepare_link_retrain [i915]] *ERROR* Timeout waiting for DDI BUF
C idle bit
[drm:drm_atomic_helper_wait_for_flip_done [drm_kms_helper]] *ERROR*
[CRTC:83:pipe C] flip_done timed out

Error appear/disappear more frequently after screen lock depending on kernel
version.

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