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External Display Issues - Lenovo ThinkPad
Reported by
derek.ti...@sanmina.com,
Nov 6 2017
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Issue descriptionUserAgent: Mozilla/5.0 (X11; CrOS x86_64 9901.54.0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/62.0.3202.74 Safari/537.36 Platform: 9901.54.0 (Official Build) beta-channel sentry Steps to reproduce the problem: 1. Connect Lenovo Thinkpad Chromebook 13 to USB-C docking station on ChromeOS after updating to 61.0.3163.123 (Official Build) (64-bit) What is the expected behavior? Screen will extend to the external display. What went wrong? Sometimes the screen will not appear on the monitor. When it does, the extended display will randomly go dark for approximately 5 seconds and then come back. I previously had no issue prior to updating to ChromeOS v61.0.3163.123. I tried switching to beta channel and updating to v62.0.3202.74 but there was no change. I believe the issue is with the docking station itself; I connected the same monitor directly to this Chromebook using a USB to HDMI adapter, and experience no display issues at all. I will also occasionally get an error that the monitor is not supported, but I only have issues when utilizing the docking station. Did this work before? Yes Version prior to v61.0.3163.123 Chrome version: 62.0.3202.74 Channel: beta OS Version: 9901.54.0 Flash Version:
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Nov 8 2017
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Nov 8 2017
We have reproduced the problem in our Chrome lab and I can verify that the issue does occur on R61 and does not occur on R60. We have also reproduced the same issue with a Samsung Chromebook Plus, demonstrating that this is not an issue isolated to the ThinkPad 13. We used a Lenovo USB-C docking station (type 40A9). This docking station uses direct video. We are aware that there is an existing issue with Chrome OS and multi-monitor support via direct video, but we are using only one external display in our tests. I don't know if other docking stations that use DisplayPort chaining to work around the direct video issue will exhibit the same behavior. The behavior can be reliably reproduced.
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Nov 20 2017
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Jan 12 2018
Any update?
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Jan 17 2018
This dock doesn't work with many other devices, like Kevin and Samus, but works just fine with newer devices like Elm. It looks like dock forcibly uses higher clock frequency.
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Sep 4
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Comment 1 by dtapu...@chromium.org
, Nov 8 2017