Bug 110286 - [ICL] SDP built-in eDP display sometimes gets stuck in bogus retrain loop
Summary: [ICL] SDP built-in eDP display sometimes gets stuck in bogus retrain loop
Status: RESOLVED INVALID
Alias: None
Product: DRI
Classification: Unclassified
Component: DRM/Intel (show other bugs)
Version: DRI git
Hardware: Other All
: medium normal
Assignee: Intel GFX Bugs mailing list
QA Contact: Intel GFX Bugs mailing list
URL:
Whiteboard:
Keywords:
Depends on:
Blocks:
 
Reported: 2019-03-29 20:37 UTC by Lyude Paul
Modified: 2019-04-02 11:23 UTC (History)
2 users (show)

See Also:
i915 platform: ICL
i915 features: display/eDP

Attachments
Boot with eDP, hotplug mini-DP (957.98 KB, text/plain)
2019-03-29 20:37 UTC, Lyude Paul 		no flags Details
Boot with eDP and Mini-DP, hotplug with Mini-DP (successful) (275.76 KB, text/plain)
2019-03-29 20:38 UTC, Lyude Paul 		no flags Details
EDID blob from eDP display (128 bytes, application/octet-stream)
2019-03-29 20:38 UTC, Lyude Paul 		no flags Details
View All

Description Lyude Paul 2019-03-29 20:37:34 UTC 
Created attachment 143811 [details]
Boot with eDP, hotplug mini-DP

Hi! I've got myself an icelake SDP: Ice Lake-U 4+2 Alpha OSV. things mostly work, but there's one pretty bizarre issue I've been hitting with the built-in eDP display.

It seems that if I boot up the machine with only the eDP display connected, things work fine. However: if I plug in a display into the Mini-DP port then the Mini-DP display comes up, but the eDP display suddenly gets stuck in a retrain loop and doesn't come back on.

Things get a bit weirder though: if I have both the eDP and mini-DP display connected when booting up the machine, then things never break. I can even hotplug the mini-DP display after booting up, and the eDP display retrains itself just fine.

Will attach dmesg logs with:

- Booting with eDP connected, and hotplugging
- Booting with eDP and Mini DP

Along with edid for the eDP display
Comment 1 Lyude Paul 2019-03-29 20:38:15 UTC 
Created attachment 143812 [details]
Boot with eDP and Mini-DP, hotplug with Mini-DP (successful)
Comment 2 Lyude Paul 2019-03-29 20:38:58 UTC 
Created attachment 143813 [details]
EDID blob from eDP display
Comment 3 Lakshmi 2019-04-01 09:25:44 UTC 
Stan, any help here?
Comment 4 Stanislav Lisovskiy 2019-04-01 09:58:33 UTC 
Looks interesting, never seen this on my board. Could be actually because I always boot it with both connected :) Will try and check..
Comment 5 Jani Saarinen 2019-04-02 11:18:13 UTC 
You need BIOS update:
10.152302] [drm:intel_bios_is_valid_vbt [i915]] BDB incomplete
[   10.152329] [drm:intel_opregion_setup [i915]] Invalid VBT in ACPI OpRegion (Mailbox #4)
Comment 6 Jani Saarinen 2019-04-02 11:19:47 UTC 
You have: BIOS ICLSFWR1.R00.2422
You should have: BIOS ICLSFWR1.R00.3108 at least.
Comment 7 Jani Saarinen 2019-04-02 11:21:36 UTC 
I meant: BIOS ICLSFWR1.R00.308x so you need at least ww08 bios.

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