[Bug 99384] [i915] One of two displays not detected

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=99384

--- Comment #1 from Ville Syrjala <ville.syrjala at linux.intel.com> ---
Jan 09 20:09:34 r-schwarzschild kernel: [drm:intel_hdmi_detect [i915]]
[CONNECTOR:59:HDMI-A-1]
Jan 09 20:09:34 r-schwarzschild kernel: [drm:drm_dp_dual_mode_detect
[drm_kms_helper]] DP dual mode HDMI ID: DP-HDMI ADAPTOR\004 (err 0)
Jan 09 20:09:34 r-schwarzschild kernel: [drm:drm_dp_dual_mode_detect
[drm_kms_helper]] DP dual mode adaptor ID: a0 (err 0)
Jan 09 20:09:34 r-schwarzschild kernel: [drm:intel_hdmi_set_edid [i915]] DP
dual mode adaptor (type 2 HDMI) detected (max TMDS clock: 300000 kHz)
Jan 09 20:09:34 r-schwarzschild kernel: [drm:i915_hotplug_work_func [i915]]
[CONNECTOR:59:HDMI-A-1] status updated from disconnected to connected

So there we were able to read the EDID.

[CONNECTOR:59:HDMI-A-1]
Jan 09 20:09:42 r-schwarzschild kernel: [drm:intel_hdmi_detect [i915]]
[CONNECTOR:59:HDMI-A-1]
Jan 09 20:09:42 r-schwarzschild kernel: [drm:gmbus_xfer [i915]] GMBUS [i915
gmbus dpb] NAK for addr: 0050 w(1)
Jan 09 20:09:42 r-schwarzschild kernel: [drm:gmbus_xfer [i915]] GMBUS [i915
gmbus dpb] NAK on first message, retry
Jan 09 20:09:42 r-schwarzschild kernel: [drm:gmbus_xfer [i915]] GMBUS [i915
gmbus dpb] NAK for addr: 0050 w(1)
Jan 09 20:09:42 r-schwarzschild kernel: [drm:drm_do_probe_ddc_edid [drm]] drm:
skipping non-existent adapter i915 gmbus dpb
Jan 09 20:09:42 r-schwarzschild kernel: [drm:drm_dp_dual_mode_detect
[drm_kms_helper]] DP dual mode HDMI ID: DP-HDMI ADAPTOR\004 (err 0)
Jan 09 20:09:42 r-schwarzschild kernel: [drm:drm_dp_dual_mode_detect
[drm_kms_helper]] DP dual mode adaptor ID: a0 (err 0)
Jan 09 20:09:42 r-schwarzschild kernel: [drm:intel_hdmi_set_edid [i915]] DP
dual mode adaptor (type 2 HDMI) detected (max TMDS clock: 300000 kHz)
Jan 09 20:09:42 r-schwarzschild kernel:
[drm:drm_helper_probe_single_connector_modes [drm_kms_helper]]
[CONNECTOR:59:HDMI-A-1] status updated from connected to disconnected
Jan 09 20:09:42 r-schwarzschild kernel:
[drm:drm_helper_probe_single_connector_modes [drm_kms_helper]]
[CONNECTOR:59:HDMI-A-1] disconnected

but here a bit later we are again unable to read it. It's quite weird since the
i2c bus seems to be fine itself since we can detect the DP dual mode chip
present on the bus. My only theory is that the dual mode chip is somehow going
crazy and preventing the i2c access for the EDID read from reaching the actual
display.

-- 
You are receiving this mail because:
You are the QA Contact for the bug.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.freedesktop.org/archives/intel-gfx-bugs/attachments/20170112/02ec3466/attachment.html>