few tests - dmesg-warn - DPLL 1 not locked
<7> [37.406460] i915 0000:00:02.0: [drm:intel_disable_transcoder [i915]] disabling pipe A
<7> [37.411912] i915 0000:00:02.0: [drm:intel_disable_shared_dpll [i915]] disable DPLL 1 (active 0x1, on? 1) for [CRTC:53:pipe A]
<7> [37.412247] i915 0000:00:02.0: [drm:intel_disable_shared_dpll [i915]] disabling DPLL 1
<7> [37.412507] i915 0000:00:02.0: [drm:intel_cdclk_dump_config [i915]] Pre changing CDCLK to 337500 kHz, VCO 8100000 kHz, ref 24000 kHz, bypass 24000 kHz, voltage level 0
<7> [37.412857] i915 0000:00:02.0: [drm:intel_modeset_verify_disabled [i915]] [ENCODER:98:DDI B/PHY B]
<7> [37.413078] i915 0000:00:02.0: [drm:intel_modeset_verify_disabled [i915]] [ENCODER:100:DP-MST A]
<7> [37.413305] i915 0000:00:02.0: [drm:intel_modeset_verify_disabled [i915]] [ENCODER:101:DP-MST B]
<7> [37.413538] i915 0000:00:02.0: [drm:intel_modeset_verify_disabled [i915]] [ENCODER:102:DP-MST C]
<7> [37.413753] i915 0000:00:02.0: [drm:intel_modeset_verify_disabled [i915]] [ENCODER:111:DDI C/PHY C]
<7> [37.413966] i915 0000:00:02.0: [drm:intel_modeset_verify_disabled [i915]] [ENCODER:113:DP-MST A]
<7> [37.414180] i915 0000:00:02.0: [drm:intel_modeset_verify_disabled [i915]] [ENCODER:114:DP-MST B]
<7> [37.414403] i915 0000:00:02.0: [drm:intel_modeset_verify_disabled [i915]] [ENCODER:115:DP-MST C]
<7> [37.414755] i915 0000:00:02.0: [drm:intel_enable_shared_dpll [i915]] enable DPLL 1 (active 0x1, on? 0) for [CRTC:53:pipe A]
<7> [37.414983] i915 0000:00:02.0: [drm:intel_enable_shared_dpll [i915]] enabling DPLL 1
<3> [37.420283] i915 0000:00:02.0: [drm] *ERROR* DPLL 1 not locked
<7> [37.420433] i915 0000:00:02.0: [drm:hsw_set_signal_levels [i915]] Using signal levels 00000000
<7> [37.421368] i915 0000:00:02.0: [drm:lspcon_wake_native_aux_ch [i915]] Native AUX CH up, DPCD version: 1.2
<7> [37.422312] i915 0000:00:02.0: [drm:drm_dp_i2c_do_msg [drm_display_helper]] AUX B/DDI B/PHY B: native defer
<7> [37.424204] i915 0000:00:02.0: [drm:drm_dp_i2c_do_msg [drm_display_helper]] AUX B/DDI B/PHY B: native defer
<7> [37.426015] i915 0000:00:02.0: [drm:drm_dp_i2c_do_msg [drm_display_helper]] AUX B/DDI B/PHY B: native defer
<7> [37.427804] i915 0000:00:02.0: [drm:drm_dp_i2c_do_msg [drm_display_helper]] AUX B/DDI B/PHY B: native defer
<7> [37.429759] i915 0000:00:02.0: [drm:drm_dp_i2c_do_msg [drm_display_helper]] AUX B/DDI B/PHY B: native defer
<7> [37.430712] i915 0000:00:02.0: [drm:drm_dp_dual_mode_detect [drm_display_helper]] DP dual mode HDMI ID: DP-HDMI ADAPTOR\004 (err 0)
<7> [37.431568] i915 0000:00:02.0: [drm:drm_dp_i2c_do_msg [drm_display_helper]] AUX B/DDI B/PHY B: native defer
<7> [37.433304] i915 0000:00:02.0: [drm:drm_dp_i2c_do_msg [drm_display_helper]] AUX B/DDI B/PHY B: native defer
<7> [37.435146] i915 0000:00:02.0: [drm:drm_dp_i2c_do_msg [drm_display_helper]] AUX B/DDI B/PHY B: native defer
<7> [37.436932] i915 0000:00:02.0: [drm:drm_dp_i2c_do_msg [drm_display_helper]] AUX B/DDI B/PHY B: native defer
<7> [37.438884] i915 0000:00:02.0: [drm:drm_dp_i2c_do_msg [drm_display_helper]] AUX B/DDI B/PHY B: native defer
<7> [37.440628] i915 0000:00:02.0: [drm:drm_dp_i2c_do_msg [drm_display_helper]] AUX B/DDI B/PHY B: native defer
<7> [37.441597] i915 0000:00:02.0: [drm:drm_dp_dual_mode_detect [drm_display_helper]] DP dual mode adaptor ID: a8 (err 0)
<7> [37.441609] i915 0000:00:02.0: [drm:lspcon_init [i915]] LSPCON detected
<7> [37.442635] i915 0000:00:02.0: [drm:drm_dp_i2c_do_msg [drm_display_helper]] AUX B/DDI B/PHY B: native defer
<7> [37.444301] i915 0000:00:02.0: [drm:drm_dp_i2c_do_msg [drm_display_helper]] AUX B/DDI B/PHY B: native defer
<7> [37.446145] i915 0000:00:02.0: [drm:drm_dp_i2c_do_msg [drm_display_helper]] AUX B/DDI B/PHY B: native defer