lspcon errors when connecting external monitor to HDMI at boot time

[Unmesh Joshi]

Hi,

I recently purchased Thinkpad P1 Gen2(Intel® Core™ i7-9850H CPU @ 2.60GHz ×
12 with Mesa Intel® UHD Graphics 630 (CFL GT2))
I have latest Ubuntu 20.04 installed. (5.4.0-40-generic #44-Ubuntu SMP Tue
Jun 23 00:01:04 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux)
I am seeing issues with an external monitor is connected to HDMI port while
booting. The monitor is not detected. If I connect the monitor 'after'
boot, it is detected, but same issues happens (blank screen) if the
machine is suspends and tries to come back up.
I have attached dmesg output with lspcon errors.

Thanks,
Unmesh
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[drm:intel_dp_link_training_clock_recovery [i915]] *ERROR* failed to enable link training
[   18.007481] [drm:lspcon_write_infoframe [i915]] *ERROR* Failed to read AVI IF control
[   18.007499] [drm:lspcon_write_infoframe [i915]] *ERROR* Failed to write AVI infoframes
[   18.711110] [drm:drm_lspcon_set_mode [drm_kms_helper]] *ERROR* LSPCON mode change timed out
[   18.711223] [drm:lspcon_change_mode.constprop.0 [i915]] *ERROR* LSPCON mode change failed
[   18.711317] [drm:lspcon_resume [i915]] *ERROR* LSPCON resume failed
[   19.119882] [drm:lspcon_wait_mode [i915]] *ERROR* LSPCON mode hasn't settled
[   19.519101] [drm:drm_lspcon_set_mode [drm_kms_helper]] *ERROR* LSPCON mode change timed out
[   19.519215] [drm:lspcon_change_mode.constprop.0 [i915]] *ERROR* LSPCON mode change failed
[   19.519309] [drm:lspcon_resume [i915]] *ERROR* LSPCON resume failed
[   19.962787] [drm:lspcon_wait_mode [i915]] *ERROR* LSPCON mode hasn't settled
[   20.406720] [drm:lspcon_wait_mode [i915]] *ERROR* LSPCON mode hasn't settled
[   20.807103] [drm:drm_lspcon_set_mode [drm_kms_helper]] *ERROR* LSPCON mode change timed out
[   20.807216] [drm:lspcon_change_mode.constprop.0 [i915]] *ERROR* LSPCON mode change failed
[   20.807308] [drm:lspcon_resume [i915]] *ERROR* LSPCON resume failed
[   21.215208] [drm:lspcon_wait_mode [i915]] *ERROR* LSPCON mode hasn't settled
[   21.615096] [drm:drm_lspcon_set_mode [drm_kms_helper]] *ERROR* LSPCON mode change timed out
[   21.615209] [drm:lspcon_change_mode.constprop.0 [i915]] *ERROR* LSPCON mode change failed
[   21.615300] [drm:lspcon_resume [i915]] *ERROR* LSPCON resume failed
[   22.022635] [drm:lspcon_wait_mode [i915]] *ERROR* LSPCON mode hasn't settled
[   22.423125] [drm:drm_lspcon_set_mode [drm_kms_helper]] *ERROR* LSPCON mode change timed out
[   22.423238] [drm:lspcon_change_mode.constprop.0 [i915]] *ERROR* LSPCON mode change failed
[   22.423330] [drm:lspcon_resume [i915]] *ERROR* LSPCON resume failed
[   22.830798] [drm:lspcon_wait_mode [i915]] *ERROR* LSPCON mode hasn't settled
[   23.231113] [drm:drm_lspcon_set_mode [drm_kms_helper]] *ERROR* LSPCON mode change timed out
[   23.231226] [drm:lspcon_change_mode.constprop.0 [i915]] *ERROR* LSPCON mode change failed
[   23.231317] [drm:lspcon_resume [i915]] *ERROR* LSPCON resume failed
[   23.639245] [drm:lspcon_wait_mode [i915]] *ERROR* LSPCON mode hasn't settled
[   24.039098] [drm:drm_lspcon_set_mode [drm_kms_helper]] *ERROR* LSPCON mode change timed out
[   24.039211] [drm:lspcon_change_mode.constprop.0 [i915]] *ERROR* LSPCON mode change failed
[   24.039304] [drm:lspcon_resume [i915]] *ERROR* LSPCON resume failed
[   24.458116] [drm:lspcon_wait_mode [i915]] *ERROR* LSPCON mode hasn't settled
[   24.859085] [drm:drm_lspcon_set_mode [drm_kms_helper]] *ERROR* LSPCON mode change timed out
[   24.859204] [drm:lspcon_change_mode.constprop.0 [i915]] *ERROR* LSPCON mode change failed
[   24.859295] [drm:lspcon_resume [i915]] *ERROR* LSPCON resume failed
[   26.073336] [drm:lspcon_wait_mode [i915]] *ERROR* LSPCON mode hasn't settled
[   26.522115] [drm:lspcon_wait_mode [i915]] *ERROR* LSPCON mode hasn't settled
[   26.923208] [drm:drm_lspcon_set_mode [drm_kms_helper]] *ERROR* LSPCON mode change timed out
[   26.923321] [drm:lspcon_change_mode.constprop.0 [i915]] *ERROR* LSPCON mode change failed
[   26.923415] [drm:lspcon_resume [i915]] *ERROR* LSPCON resume failed
[   27.330963] [drm:lspcon_wait_mode [i915]] *ERROR* LSPCON mode hasn't settled
[   27.731061] [drm:drm_lspcon_set_mode [drm_kms_helper]] *ERROR* LSPCON mode change timed out
[   27.731172] [drm:lspcon_change_mode.constprop.0 [i915]] *ERROR* LSPCON mode change failed
[   27.731264] [drm:lspcon_resume [i915]] *ERROR* LSPCON resume failed
[   28.169770] [drm:lspcon_wait_mode [i915]] *ERROR* LSPCON mode hasn't settled
[   28.615212] [drm:lspcon_wait_mode [i915]] *ERROR* LSPCON mode hasn't settled
[   29.015073] [drm:drm_lspcon_set_mode [drm_kms_helper]] *ERROR* LSPCON mode change timed out
[   29.015186] [drm:lspcon_change_mode.constprop.0 [i915]] *ERROR* LSPCON mode change failed
[   29.015279] [drm:lspcon_resume [i915]] *ERROR* LSPCON resume failed
[   29.425925] [drm:lspcon_wait_mode [i915]] *ERROR* LSPCON mode hasn't settled
[   29.827204] [drm:drm_lspcon_set_mode [drm_kms_helper]] *ERROR* LSPCON mode change timed out
[   29.827314] [drm:lspcon_change_mode.constprop.0 [i915]] *ERROR* LSPCON mode change failed
[   29.827406] [drm:lspcon_resume [i915]] *ERROR* LSPCON resume failed
[   30.235037] [drm:lspcon_wait_mode [i915]] *ERROR* LSPCON mode hasn't settled
[   30.635207] [drm:drm_lspcon_set_mode [drm_kms_helper]] *ERROR* LSPCON mode change timed out
[   30.635322] [drm:lspcon_change_mode.constprop.0 [i915]] *ERROR* LSPCON mode change failed
[   30.635414] [drm:lspcon_resume [i915]] *ERROR* LSPCON resume failed
[   31.045923] [drm:lspcon_wait_mode [i915]] *ERROR* LSPCON mode hasn't settled
[   31.447207] [drm:drm_lspcon_set_mode [drm_kms_helper]] *ERROR* LSPCON mode change timed out
[   31.447319] [drm:lspcon_change_mode.constprop.0 [i915]] *ERROR* LSPCON mode change failed
[   31.447412] [drm:lspcon_resume [i915]] *ERROR* LSPCON resume failed
[   31.855497] [drm:lspcon_wait_mode [i915]] *ERROR* LSPCON mode hasn't settled
[   32.255206] [drm:drm_lspcon_set_mode [drm_kms_helper]] *ERROR* LSPCON mode change timed out
[   32.255319] [drm:lspcon_change_mode.constprop.0 [i915]] *ERROR* LSPCON mode change failed
[   32.255412] [drm:lspcon_resume [i915]] *ERROR* LSPCON resume failed
[   32.698083] [drm:lspcon_wait_mode [i915]] *ERROR* LSPCON mode hasn't settled
[   32.702031] [drm:intel_dp_get_link_train_fallback_values [i915]] *ERROR* Link Training Unsuccessful
[   33.145606] [drm:lspcon_wait_mode [i915]] *ERROR* LSPCON mode hasn't settled
[   33.547219] [drm:drm_lspcon_set_mode [drm_kms_helper]] *ERROR* LSPCON mode change timed out
[   33.547331] [drm:lspcon_change_mode.constprop.0 [i915]] *ERROR* LSPCON mode change failed
[   33.547424] [drm:lspcon_resume [i915]] *ERROR* LSPCON resume failed
[   33.553369] [drm:intel_dp_get_link_train_fallback_values [i915]] *ERROR* Link Training Unsuccessful
[   33.975531] [drm:lspcon_wait_mode [i915]] *ERROR* LSPCON mode hasn't settled
[   34.375212] [drm:drm_lspcon_set_mode [drm_kms_helper]] *ERROR* LSPCON mode change timed out
[   34.375330] [drm:lspcon_change_mode.constprop.0 [i915]] *ERROR* LSPCON mode change failed
[   34.375423] [drm:lspcon_resume [i915]] *ERROR* LSPCON resume failed
[   34.381512] [drm:intel_dp_get_link_train_fallback_values [i915]] *ERROR* Link Training Unsuccessful