[Bug 99322] [SKL] Flashing black screen with dual monitors

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Fri May 11 10:20:50 UTC 2018 

https://bugs.freedesktop.org/show_bug.cgi?id=99322

--- Comment #28 from Tim Small <tim at buttersideup.com> ---
With 4.17 (now running 4.17.0-rc4-drm-tip+), this now seems to happen much
sooner after boot (usually within 5 minutes), and more frequently.

Test system is Dell Optiplex 5040 with two 4k monitors both attached to
DisplayPort.

It looks like there are a few spurious hot plug events (at least I presume they
are spurious - no hardware is actually physically hot plugged e.g. hot plug
events are seen on the HDMI port - which never has anything plugged into it),
and the flashing/black behaviour seems to start after these.

The flashing/black display seems like it might occur after only after the
spurious hot plug events come in, so I suppose it might be possible to
reproduce them by a few real hotplugs?


--
May 11 11:00:46 ermintrude kernel: [   10.224260]
[drm:i915_audio_component_get_eld [i915]] Not valid for port D
May 11 11:00:46 ermintrude kernel: [   10.224278]
[drm:i915_audio_component_get_eld [i915]] Not valid for port D
May 11 11:00:46 ermintrude kernel: [   10.224296]
[drm:i915_audio_component_get_eld [i915]] Not valid for port D
May 11 11:00:46 ermintrude kernel: [   18.225601] [drm:gen8_de_irq_handler
[i915]] hotplug event received, stat 0x00800000, dig 0x10121010, pins
0x00000080
May 11 11:00:46 ermintrude kernel: [   18.225650] [drm:intel_hpd_irq_handler
[i915]] digital hpd port D - long
May 11 11:00:46 ermintrude kernel: [   18.225697] [drm:intel_hpd_irq_handler
[i915]] Received HPD interrupt on PIN 7 - cnt: 0
May 11 11:00:46 ermintrude kernel: [   18.225754] [drm:intel_dp_hpd_pulse
[i915]] got hpd irq on port D - long
May 11 11:00:46 ermintrude kernel: [   18.225803] [drm:i915_hotplug_work_func
[i915]] running encoder hotplug functions
May 11 11:00:46 ermintrude kernel: [   18.225849] [drm:i915_hotplug_work_func
[i915]] Connector DP-2 (pin 7) received hotplug event.
May 11 11:00:46 ermintrude kernel: [   18.225894] [drm:intel_dp_detect [i915]]
[CONNECTOR:85:DP-2]
May 11 11:00:46 ermintrude kernel: [   18.226347] [drm:intel_dp_read_dpcd
[i915]] DPCD: 12 14 e4 01 01 01 01 81 00 00 00 00 00 00 00
May 11 11:00:46 ermintrude kernel: [   18.227353] [drm:intel_dp_print_rates
[i915]] source rates: 162000, 216000, 270000, 324000, 432000, 540000
--
May 11 11:00:46 ermintrude kernel: [   18.227436] [drm:intel_dp_print_rates
[i915]] common rates: 162000, 270000, 540000
May 11 11:00:46 ermintrude kernel: [   18.227826] [drm:drm_dp_read_desc
[drm_kms_helper]] DP branch: OUI 00-80-e1 dev-ID Dp1.2 HW-rev 0.0 SW-rev 0.21
quirks 0x0000
May 11 11:00:46 ermintrude kernel: [   18.228147] [drm:intel_dp_detect [i915]]
Sink is MST capable
May 11 11:00:46 ermintrude kernel: [   18.229299] [drm:i915_hotplug_work_func
[i915]] Connector HDMI-A-3 (pin 7) received hotplug event.
May 11 11:00:46 ermintrude kernel: [   18.229341] [drm:intel_hdmi_detect
[i915]] [CONNECTOR:90:HDMI-A-3]
May 11 11:00:46 ermintrude kernel: [   18.229673] [drm:do_gmbus_xfer [i915]]
GMBUS [i915 gmbus dpd] NAK for addr: 0050 w(1)
May 11 11:00:46 ermintrude kernel: [   18.229712] [drm:do_gmbus_xfer [i915]]
GMBUS [i915 gmbus dpd] NAK on first message, retry
--
May 11 11:00:46 ermintrude kernel: [   18.233206] [drm:do_gmbus_xfer [i915]]
GMBUS [i915 gmbus dpd] NAK on first message, retry
May 11 11:00:46 ermintrude kernel: [   18.233514] [drm:do_gmbus_xfer [i915]]
GMBUS [i915 gmbus dpd] NAK for addr: 0040 w(1)
May 11 11:00:46 ermintrude kernel: [   18.233539] [drm:drm_dp_dual_mode_detect
[drm_kms_helper]] DP dual mode HDMI ID:  (err -6)
May 11 11:00:46 ermintrude kernel: [   18.239730] [drm:gen8_de_irq_handler
[i915]] hotplug event received, stat 0x00800000, dig 0x10111010, pins
0x00000080
May 11 11:00:46 ermintrude kernel: [   18.239779] [drm:intel_hpd_irq_handler
[i915]] digital hpd port D - short
May 11 11:00:46 ermintrude kernel: [   18.239868] [drm:intel_dp_hpd_pulse
[i915]] got hpd irq on port D - short
May 11 11:00:46 ermintrude kernel: [   18.240320]
[drm:intel_dp_check_mst_status [i915]] got esi 01 10 01
May 11 11:00:46 ermintrude kernel: [   18.241707]
[drm:intel_dp_check_mst_status [i915]] got esi2 01 00 00
May 11 11:00:46 ermintrude kernel: [   18.241752]
[drm:intel_dp_check_mst_status [i915]] got esi 01 00 00
May 11 11:00:46 ermintrude kernel: [   18.243318] [drm:gen8_de_irq_handler
[i915]] hotplug event received, stat 0x00800000, dig 0x10111010, pins
0x00000080
May 11 11:00:46 ermintrude kernel: [   18.243366] [drm:intel_hpd_irq_handler
[i915]] digital hpd port D - short
May 11 11:00:46 ermintrude kernel: [   18.243416] [drm:intel_dp_hpd_pulse
[i915]] got hpd irq on port D - short
May 11 11:00:46 ermintrude kernel: [   18.243848]
[drm:intel_dp_check_mst_status [i915]] got esi 01 10 00
May 11 11:00:46 ermintrude kernel: [   18.245257]
[drm:intel_dp_check_mst_status [i915]] got esi2 01 00 00
May 11 11:00:46 ermintrude kernel: [   18.245305]
[drm:intel_dp_check_mst_status [i915]] got esi 01 00 00
May 11 11:00:46 ermintrude kernel: [   18.246987] [drm:gen8_de_irq_handler
[i915]] hotplug event received, stat 0x00800000, dig 0x10111010, pins
0x00000080
May 11 11:00:46 ermintrude kernel: [   18.247036] [drm:intel_hpd_irq_handler
[i915]] digital hpd port D - short
May 11 11:00:46 ermintrude kernel: [   18.247089] [drm:intel_dp_hpd_pulse
[i915]] got hpd irq on port D - short
May 11 11:00:46 ermintrude kernel: [   18.247522]
[drm:intel_dp_check_mst_status [i915]] got esi 01 10 00
--
May 11 11:00:46 ermintrude kernel: [   18.248355] [drm:drm_dp_send_link_address
[drm_kms_helper]] port 2: input 0, pdt: 0, pn: 1, dpcd_rev: 00, mcs: 0, ddps:
0, ldps 0, sdp 0/0
May 11 11:00:46 ermintrude kernel: [   18.249178]
[drm:intel_dp_check_mst_status [i915]] got esi2 01 00 00
May 11 11:00:46 ermintrude kernel: [   18.249220]
[drm:intel_dp_check_mst_status [i915]] got esi 01 00 00
May 11 11:00:46 ermintrude kernel: [   18.252375] [drm:gen8_de_irq_handler
[i915]] hotplug event received, stat 0x00800000, dig 0x10111010, pins
0x00000080
May 11 11:00:46 ermintrude kernel: [   18.252424] [drm:intel_hpd_irq_handler
[i915]] digital hpd port D - short
May 11 11:00:46 ermintrude kernel: [   18.252473] [drm:intel_dp_hpd_pulse
[i915]] got hpd irq on port D - short
May 11 11:00:46 ermintrude kernel: [   18.252911]
[drm:intel_dp_check_mst_status [i915]] got esi 01 10 00
May 11 11:00:46 ermintrude kernel: [   18.253367]
[drm:drm_dp_send_enum_path_resources.isra.21 [drm_kms_helper]] enum path
resources 8: 2560 2560
May 11 11:00:46 ermintrude kernel: [   18.253941]
[drm:intel_dp_check_mst_status [i915]] got esi2 01 00 00
May 11 11:00:46 ermintrude kernel: [   18.253990]
[drm:intel_dp_check_mst_status [i915]] got esi 01 00 00
May 11 11:00:46 ermintrude kernel: [   18.261817] [drm:gen8_de_irq_handler
[i915]] hotplug event received, stat 0x00800000, dig 0x10111010, pins
0x00000080
May 11 11:00:46 ermintrude kernel: [   18.261868] [drm:intel_hpd_irq_handler
[i915]] digital hpd port D - short
May 11 11:00:46 ermintrude kernel: [   18.261921] [drm:intel_dp_hpd_pulse
[i915]] got hpd irq on port D - short
May 11 11:00:46 ermintrude kernel: [   18.262356]
[drm:intel_dp_check_mst_status [i915]] got esi 01 10 00
May 11 11:00:46 ermintrude kernel: [   18.264740]
[drm:intel_dp_check_mst_status [i915]] got esi2 01 00 00
May 11 11:00:46 ermintrude kernel: [   18.264783]
[drm:intel_dp_check_mst_status [i915]] got esi 01 00 00
May 11 11:00:46 ermintrude kernel: [   18.269967] [drm:gen8_de_irq_handler
[i915]] hotplug event received, stat 0x00800000, dig 0x10111010, pins
0x00000080
May 11 11:00:46 ermintrude kernel: [   18.270015] [drm:intel_hpd_irq_handler
[i915]] digital hpd port D - short
May 11 11:00:46 ermintrude kernel: [   18.270063] [drm:intel_dp_hpd_pulse
[i915]] got hpd irq on port D - short
May 11 11:00:46 ermintrude kernel: [   18.270492]
[drm:intel_dp_check_mst_status [i915]] got esi 01 10 00
May 11 11:00:46 ermintrude kernel: [   18.272262]
[drm:intel_dp_check_mst_status [i915]] got esi2 01 00 00
May 11 11:00:46 ermintrude kernel: [   18.272306]
[drm:intel_dp_check_mst_status [i915]] got esi 01 00 00
May 11 11:00:46 ermintrude kernel: [   18.274867] [drm:gen8_de_irq_handler
[i915]] hotplug event received, stat 0x00800000, dig 0x10111010, pins
0x00000080
May 11 11:00:46 ermintrude kernel: [   18.274909] [drm:intel_hpd_irq_handler
[i915]] digital hpd port D - short
May 11 11:00:46 ermintrude kernel: [   18.274955] [drm:intel_dp_hpd_pulse
[i915]] got hpd irq on port D - short
May 11 11:00:46 ermintrude kernel: [   18.275381]
[drm:intel_dp_check_mst_status [i915]] got esi 01 10 00
May 11 11:00:46 ermintrude kernel: [   18.277145]
[drm:intel_dp_check_mst_status [i915]] got esi2 01 00 00
May 11 11:00:46 ermintrude kernel: [   18.277193]
[drm:intel_dp_check_mst_status [i915]] got esi 01 00 00
May 11 11:00:46 ermintrude kernel: [   18.279791] [drm:gen8_de_irq_handler
[i915]] hotplug event received, stat 0x00800000, dig 0x10111010, pins
0x00000080
May 11 11:00:46 ermintrude kernel: [   18.279837] [drm:intel_hpd_irq_handler
[i915]] digital hpd port D - short
May 11 11:00:46 ermintrude kernel: [   18.279887] [drm:intel_dp_hpd_pulse
[i915]] got hpd irq on port D - short
May 11 11:00:46 ermintrude kernel: [   18.280318]
[drm:intel_dp_check_mst_status [i915]] got esi 01 10 00
May 11 11:00:46 ermintrude kernel: [   18.282070]
[drm:intel_dp_check_mst_status [i915]] got esi2 01 00 00
May 11 11:00:46 ermintrude kernel: [   18.282114]
[drm:intel_dp_check_mst_status [i915]] got esi 01 00 00
May 11 11:00:46 ermintrude kernel: [   18.284772] [drm:gen8_de_irq_handler
[i915]] hotplug event received, stat 0x00800000, dig 0x10111010, pins
0x00000080
May 11 11:00:46 ermintrude kernel: [   18.284818] [drm:intel_hpd_irq_handler
[i915]] digital hpd port D - short
May 11 11:00:46 ermintrude kernel: [   18.284867] [drm:intel_dp_hpd_pulse
[i915]] got hpd irq on port D - short
May 11 11:00:46 ermintrude kernel: [   18.285313]
[drm:intel_dp_check_mst_status [i915]] got esi 01 10 00
May 11 11:00:46 ermintrude kernel: [   18.288441]
[drm:intel_dp_check_mst_status [i915]] got esi2 01 00 00
May 11 11:00:46 ermintrude kernel: [   18.288485]
[drm:intel_dp_check_mst_status [i915]] got esi 01 00 00
May 11 11:00:46 ermintrude kernel: [   18.294263] [drm:gen8_de_irq_handler
[i915]] hotplug event received, stat 0x00800000, dig 0x10111010, pins
0x00000080
May 11 11:00:46 ermintrude kernel: [   18.294299] [drm:intel_hpd_irq_handler
[i915]] digital hpd port D - short
May 11 11:00:46 ermintrude kernel: [   18.294335] [drm:intel_dp_hpd_pulse
[i915]] got hpd irq on port D - short
May 11 11:00:46 ermintrude kernel: [   18.294754]
[drm:intel_dp_check_mst_status [i915]] got esi 01 10 00
May 11 11:00:46 ermintrude kernel: [   18.296492]
[drm:intel_dp_check_mst_status [i915]] got esi2 01 00 00
May 11 11:00:46 ermintrude kernel: [   18.296526]
[drm:intel_dp_check_mst_status [i915]] got esi 01 00 00
May 11 11:00:46 ermintrude kernel: [   18.299153] [drm:gen8_de_irq_handler
[i915]] hotplug event received, stat 0x00800000, dig 0x10111010, pins
0x00000080
May 11 11:00:46 ermintrude kernel: [   18.299179] [drm:intel_hpd_irq_handler
[i915]] digital hpd port D - short
May 11 11:00:46 ermintrude kernel: [   18.299207] [drm:intel_dp_hpd_pulse
[i915]] got hpd irq on port D - short
May 11 11:00:46 ermintrude kernel: [   18.299629]
[drm:intel_dp_check_mst_status [i915]] got esi 01 10 00
May 11 11:00:46 ermintrude kernel: [   18.301322]
[drm:intel_dp_check_mst_status [i915]] got esi2 01 00 00
May 11 11:00:46 ermintrude kernel: [   18.301347]
[drm:intel_dp_check_mst_status [i915]] got esi 01 00 00
May 11 11:00:46 ermintrude kernel: [   18.304076] [drm:gen8_de_irq_handler
[i915]] hotplug event received, stat 0x00800000, dig 0x10111010, pins
0x00000080
May 11 11:00:46 ermintrude kernel: [   18.304098] [drm:intel_hpd_irq_handler
[i915]] digital hpd port D - short
May 11 11:00:46 ermintrude kernel: [   18.304120] [drm:intel_dp_hpd_pulse
[i915]] got hpd irq on port D - short
May 11 11:00:46 ermintrude kernel: [   18.304515]
[drm:intel_dp_check_mst_status [i915]] got esi 01 10 00
May 11 11:00:46 ermintrude kernel: [   18.306213]
[drm:intel_dp_check_mst_status [i915]] got esi2 01 00 00
May 11 11:00:46 ermintrude kernel: [   18.306234]
[drm:intel_dp_check_mst_status [i915]] got esi 01 00 00
May 11 11:00:46 ermintrude kernel: [   18.309099] [drm:gen8_de_irq_handler
[i915]] hotplug event received, stat 0x00800000, dig 0x10111010, pins
0x00000080
May 11 11:00:46 ermintrude kernel: [   18.309118] [drm:intel_hpd_irq_handler
[i915]] digital hpd port D - short
May 11 11:00:46 ermintrude kernel: [   18.309139] [drm:intel_dp_hpd_pulse
[i915]] got hpd irq on port D - short
May 11 11:00:46 ermintrude kernel: [   18.309543]
[drm:intel_dp_check_mst_status [i915]] got esi 01 10 00
--
May 11 11:00:46 ermintrude kernel: [   18.333542]
[drm:verify_single_dpll_state.isra.114 [i915]] DPLL 3
May 11 11:00:46 ermintrude kernel: [   18.346684] [drm:intel_enable_shared_dpll
[i915]] enable DPLL 1 (active 3, on? 1) for crtc 55
May 11 11:00:46 ermintrude kernel: [   18.346708] [drm:intel_mst_pre_enable_dp
[i915]] active links 0
May 11 11:00:46 ermintrude kernel: [   18.350177] [drm:gen8_de_irq_handler
[i915]] hotplug event received, stat 0x00800000, dig 0x10111010, pins
0x00000080
May 11 11:00:46 ermintrude kernel: [   18.350242] [drm:intel_hpd_irq_handler
[i915]] digital hpd port D - short
May 11 11:00:46 ermintrude kernel: [   18.350322] [drm:intel_dp_hpd_pulse
[i915]] got hpd irq on port D - short
May 11 11:00:46 ermintrude kernel: [   18.350788]
[drm:intel_dp_check_mst_status [i915]] got esi 01 10 00
--
May 11 11:00:46 ermintrude kernel: [   18.382100] [drm:intel_mst_enable_dp
[i915]] active links 1
May 11 11:00:46 ermintrude kernel: [   18.393637] [drm:drm_dp_check_act_status
[drm_kms_helper]] failed to get ACT bit 1 after 30 retries
May 11 11:00:46 ermintrude kernel: [   18.393651]
[drm:drm_dp_update_payload_part2 [drm_kms_helper]] payload 0 1
May 11 11:00:46 ermintrude kernel: [   18.397012] [drm:gen8_de_irq_handler
[i915]] hotplug event received, stat 0x00800000, dig 0x10111010, pins
0x00000080
May 11 11:00:46 ermintrude kernel: [   18.397078] [drm:intel_hpd_irq_handler
[i915]] digital hpd port D - short
May 11 11:00:46 ermintrude kernel: [   18.397159] [drm:intel_dp_hpd_pulse
[i915]] got hpd irq on port D - short
May 11 11:00:46 ermintrude kernel: [   18.397622]
[drm:intel_dp_check_mst_status [i915]] got esi 01 00 00
May 11 11:00:46 ermintrude kernel: [   18.399125] [drm:gen8_de_irq_handler
[i915]] hotplug event received, stat 0x00800000, dig 0x10111010, pins
0x00000080
May 11 11:00:46 ermintrude kernel: [   18.399187] [drm:intel_hpd_irq_handler
[i915]] digital hpd port D - short
May 11 11:00:46 ermintrude kernel: [   18.399253] [drm:intel_dp_hpd_pulse
[i915]] got hpd irq on port D - short
May 11 11:00:46 ermintrude kernel: [   18.399704]
[drm:intel_dp_check_mst_status [i915]] got esi 01 10 00
--
May 11 11:00:46 ermintrude kernel: [   18.442480] [drm:drm_setup_crtcs
[drm_kms_helper]] picking CRTCs for 3840x2160 config
May 11 11:00:46 ermintrude kernel: [   18.442498] [drm:drm_setup_crtcs
[drm_kms_helper]] desired mode 3840x2160 set on crtc 41 (0,0)
May 11 11:00:46 ermintrude kernel: [   18.442510] [drm:drm_setup_crtcs
[drm_kms_helper]] desired mode 3840x2160 set on crtc 55 (0,0)
May 11 11:00:46 ermintrude kernel: [   18.567263] [drm:gen8_de_irq_handler
[i915]] hotplug event received, stat 0x00800000, dig 0x10111010, pins
0x00000080
May 11 11:00:46 ermintrude kernel: [   18.567338] [drm:intel_hpd_irq_handler
[i915]] digital hpd port D - short
May 11 11:00:46 ermintrude kernel: [   18.567465] [drm:intel_dp_hpd_pulse
[i915]] got hpd irq on port D - short
May 11 11:00:46 ermintrude kernel: [   18.567967]
[drm:intel_dp_check_mst_status [i915]] channel EQ not ok, retraining
--
May 11 11:01:35 ermintrude kernel: [   67.169659]
[drm:drm_mode_debug_printmodeline [drm]] Modeline 146:"720x400" 70 28320 720
738 846 900 400 412 414 449 0x40 0x6
May 11 11:01:35 ermintrude kernel: [   67.169760]
[drm:drm_helper_probe_single_connector_modes [drm_kms_helper]]
[CONNECTOR:119:DP-5]
May 11 11:01:35 ermintrude kernel: [   67.169766]
[drm:drm_helper_probe_single_connector_modes [drm_kms_helper]]
[CONNECTOR:119:DP-5] disconnected
May 11 11:03:17 ermintrude kernel: [  169.628867] [drm:gen8_de_irq_handler
[i915]] hotplug event received, stat 0x00800000, dig 0x10111010, pins
0x00000080
May 11 11:03:17 ermintrude kernel: [  169.628891] [drm:intel_hpd_irq_handler
[i915]] digital hpd port D - short
May 11 11:03:17 ermintrude kernel: [  169.628919] [drm:intel_dp_hpd_pulse
[i915]] got hpd irq on port D - short
May 11 11:03:17 ermintrude kernel: [  169.629341]
[drm:intel_dp_check_mst_status [i915]] channel EQ not ok, retraining
--
May 11 11:03:17 ermintrude kernel: [  169.663560]
[drm:drm_mode_debug_printmodeline [drm]] Modeline 146:"720x400" 70 28320 720
738 846 900 400 412 414 449 0x40 0x6
May 11 11:03:17 ermintrude kernel: [  169.663958]
[drm:drm_helper_probe_single_connector_modes [drm_kms_helper]]
[CONNECTOR:119:DP-5]
May 11 11:03:17 ermintrude kernel: [  169.663962]
[drm:drm_helper_probe_single_connector_modes [drm_kms_helper]]
[CONNECTOR:119:DP-5] disconnected
May 11 11:03:18 ermintrude kernel: [  170.309991] [drm:gen8_de_irq_handler
[i915]] hotplug event received, stat 0x00400000, dig 0x10101110, pins
0x00000040
May 11 11:03:18 ermintrude kernel: [  170.310017] [drm:intel_hpd_irq_handler
[i915]] digital hpd port C - short
May 11 11:03:18 ermintrude kernel: [  170.310063] [drm:intel_dp_hpd_pulse
[i915]] got hpd irq on port C - short
May 11 11:03:18 ermintrude kernel: [  170.310499] [drm:intel_dp_read_dpcd
[i915]] DPCD: 12 14 c4 01 01 00 01 40 02 02 06 00 00 00 00
May 11 11:03:18 ermintrude kernel: [  170.311489] [drm:i915_hotplug_work_func
[i915]] running encoder hotplug functions
May 11 11:03:18 ermintrude kernel: [  170.311515] [drm:i915_hotplug_work_func
[i915]] Connector DP-1 (pin 6) received hotplug event.
May 11 11:03:18 ermintrude kernel: [  170.311540] [drm:intel_dp_detect [i915]]
[CONNECTOR:77:DP-1]
May 11 11:03:18 ermintrude kernel: [  170.311966] [drm:intel_dp_read_dpcd
[i915]] DPCD: 12 14 c4 01 01 00 01 40 02 02 06 00 00 00 00
May 11 11:03:18 ermintrude kernel: [  170.312265] [drm:intel_dp_print_rates
[i915]] source rates: 162000, 216000, 270000, 324000, 432000, 540000
--
May 11 11:03:18 ermintrude kernel: [  170.325597]
[drm:intel_dp_set_signal_levels [i915]] Using pre-emphasis level 1
May 11 11:03:18 ermintrude kernel: [  170.326480]
[drm:intel_dp_start_link_train [i915]] Channel EQ done. DP Training successful
May 11 11:03:18 ermintrude kernel: [  170.326656]
[drm:intel_dp_start_link_train [i915]] [CONNECTOR:77:DP-1] Link Training Passed
at Link Rate = 540000, Lane count = 4
May 11 11:03:18 ermintrude kernel: [  170.338599] [drm:i915_hotplug_work_func
[i915]] Connector HDMI-A-2 (pin 6) received hotplug event.
May 11 11:03:18 ermintrude kernel: [  170.338631] [drm:intel_hdmi_detect
[i915]] [CONNECTOR:82:HDMI-A-2]
May 11 11:03:18 ermintrude kernel: [  170.338866] [drm:do_gmbus_xfer [i915]]
GMBUS [i915 gmbus dpc] NAK for addr: 0050 w(1)
May 11 11:03:18 ermintrude kernel: [  170.338885] [drm:do_gmbus_xfer [i915]]
GMBUS [i915 gmbus dpc] NAK on first message, retry

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