Chromebook Pixel Does Not Appear to Be Extending To Full Display Resolution When In Use With USB-C dock
Reported by
stvwndr...@gmail.com,
May 23 2016
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Issue descriptionUserAgent: Mozilla/5.0 (X11; CrOS x86_64 8172.39.0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/51.0.2704.55 Safari/537.36 Platform: 8172.39.0 (Official Build) beta-channel samus Steps to reproduce the problem: 1. Update Chrome OS to latest version of Chrome 51. 2. Plug external displays into HP Elite USB-C dock. 3. Plug dock into Chromebook Pixel 4. External displays extend at a lower resolution than what is listed in the display settings. What is the expected behavior? External displays should extend at the same resolution as given in the display settings. What went wrong? First off, I'm not sure if this is an issue with my Chromebook's usb-c port, the usb-c dock or the displaylink integration in Chrome OS 51. I'm hoping this investigation will help clear that up. I bought an HP Elite USB-C dock after the announcement of the Chromebook 13 by HP. I found through a search of crbug.com that Displaylink, which drives the external displays of the dock, is not officially supported until Chrome OS 51, so I updated to the beta channel to get this functionality. After updating, the external displays worked but not at full resolution. As seen in the screenshots, the internal UI says that I am extending these monitors at 2560x1600; however, the menu bar in the bottom right hand side of the screen says it's only displaying at 2054x1158. This is the case with both the Chromebook open and in the docked positions. Changing down to 1920x1200 allows the resolution to be properly displayed on my external monitor as 1920x1200; however, selecting 2560x1600 again from the resolution options again extends the display to only 2054x1158. I have also gotten the "it's not working out with your monitor" notification a couple of times but again, I'm not sure which part of my setup has the issue. I have not been able to test the system with a USB-C to DisplayPort/HDMI cable yet as that is on order. Removing one of the monitors from the dock also does not fix the issue. Please let me know if there are any logs/settings I can retrieve on the system to help diagnose this issue. Did this work before? N/A Chrome version: 51.0.2704.55 Channel: beta OS Version: 8172.39.0 Flash Version: Shockwave Flash 21.0 r0 Hardware: Laptop: Chromebook Pixel 2 Dock: HP Elite USB-C Docking Station (T3V74UT#ABA) External Monitors: HP Z30i (plugged in to dock via HDMI and DisplayPort)
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May 24 2016
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Jun 8 2016
Was able to test with a usb-c to displayport cable and that works fine for outputting a full 2560x1600 output to my Z30i monitors. Of note, though, USB-C to Displayport is not DisplayLink but confirms that the Chromebook Pixel is functioning correctly. Looking online a bit more, it does seem that 2048x1152 is a limit for some DisplayLink connectivity (http://support.displaylink.com/knowledgebase/articles/525038-displaylink-display-resolution-support), however, because this dock supports dual outputs, I would assume that only driving one Z30i monitor through the dock would allow the dock to display the full resolution (the resolution appears but is still driving only 2048x1152). Please let me know if there are any other diagnostics I can provide.
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Jun 9 2016
Well let's see if displaylink thinks it's expected behavior, if so we can close it.
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Jun 15 2016
Okay, looks like it's definitely a driver issue with the Chromebook Pixel 2 (2015 edition). I bought another DisplayLink dock, this time through USB 3.0. Chrome OS again extends to only 2048x1152 even though it indicates that it is able to extend to 2560x1600. When testing with DisplayLink driver installed on OS X, the dock worked fine and displayed at 2560x1600. My question is - in the live demos of the HP Chromebook 13, it showed displaylink working correctly for 2K monitors (2560x1440 or 1600) - was there a special driver in Chrome OS for the HP launch? Should we just wait for support for the Pixel 2 from DisplayLink?
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Jul 16 2016
I'm having the same issue with the HP Chromebook 13 and the HP Elite USB-C Dock. One display works fine, but as soon as I plug another one I get the same issue than the one reported. Version 51.0.2704.106 (64-bit) Platform 8172.62.0 (Official Build) stable-channel chell Firmware Google_Chell.7820.98.0
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Jul 17 2017
This issue has been Available for over a year. If it's no longer important or seems unlikely to be fixed, please consider closing it out. If it is important, please re-triage the issue. Sorry for the inconvenience if the bug really should have been left as Available. If you change it back, also remove the "Hotlist-Recharge-Cold" label. For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot
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Nov 1 2017
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Nov 2 2017
This issue also seems to exist with the Pixelbook. Best I can get is 2560 x 1440 on a DELL P2415Q with this dock. Google Chrome 62.0.3202.74 (Official Build) (64-bit) Revision 0 Platform 9901.54.0 (Official Build) stable-channel eve Firmware Version Google_Eve.9584.95.0 Customization ID GOOGLE-EVE
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Nov 8 2017
These docks have pixel clock limitations, so this is pretty much expected... |
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