[Bug 106659] [hdmi retimer?] No signal after switch from HDM1 to HDM2 and return in HDM1

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=106659

--- Comment #30 from fatez <stefano.ruzzon at icloud.com> ---
(In reply to Imre Deak from comment #29)
> Could you please attach a dmesg log booting a current drm-tip kernel with
> drm.debug=0x1e kernel parameter? The log should include all the messages
> starting from bootup up to the point where you observe the error. If
> necessary you can increase the log buffer size adding something like
> log_buf_len=4M to the kernel parameters.

latest drm-tip 

NucBox:~$ uname -r
4.18.0-rc4+


[26066.771837] [drm:intel_hpd_irq_handler] Received HPD interrupt on PIN 5 -
cnt: 0
[26066.771936] [drm:i915_hotplug_work_func] running encoder hotplug functions
[26066.771964] [drm:i915_hotplug_work_func] Connector HDMI-A-1 (pin 5) received
hotplug event.
[26066.771978] [drm:intel_hdmi_detect] [CONNECTOR:101:HDMI-A-1]
[26066.798634] [drm:do_gmbus_xfer] GMBUS [i915 gmbus dpb] NAK for addr: 0040
w(1)
[26066.798641] [drm:do_gmbus_xfer] GMBUS [i915 gmbus dpb] NAK on first message,
retry
[26066.798815] [drm:do_gmbus_xfer] GMBUS [i915 gmbus dpb] NAK for addr: 0040
w(1)
[26066.798826] [drm:drm_dp_dual_mode_detect] DP dual mode HDMI ID:  (err -6)
[26066.798834] [drm:drm_rgb_quant_range_selectable] CEA VCDB 0x0f
[26066.798839] [drm:drm_detect_monitor_audio] Monitor has basic audio support
[26067.214616] [drm:gen8_de_irq_handler] hotplug event received, stat
0x00000010, dig 0x1000181a, pins 0x00000020, long 0x00000020
[26067.214629] [drm:intel_hpd_irq_handler] Received HPD interrupt on PIN 5 -
cnt: 1
[26067.214716] [drm:i915_hotplug_work_func] running encoder hotplug functions
[26067.214728] [drm:i915_hotplug_work_func] Connector HDMI-A-1 (pin 5) received
hotplug event.
[26067.214752] [drm:intel_hdmi_detect] [CONNECTOR:101:HDMI-A-1]
[26067.242279] [drm:do_gmbus_xfer] GMBUS [i915 gmbus dpb] NAK for addr: 0040
w(1)
[26067.242287] [drm:do_gmbus_xfer] GMBUS [i915 gmbus dpb] NAK on first message,
retry
[26067.242464] [drm:do_gmbus_xfer] GMBUS [i915 gmbus dpb] NAK for addr: 0040
w(1)
[26067.242475] [drm:drm_dp_dual_mode_detect] DP dual mode HDMI ID:  (err -6)
[26067.242484] [drm:drm_rgb_quant_range_selectable] CEA VCDB 0x0f
[26067.242490] [drm:drm_detect_monitor_audio] Monitor has basic audio support

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