ONLY display_SwitchMode.fast_switch test is still passing.

Affected tests are: 
display_HotPlugAtBoot.extended
display_HotPlugAtBoot.mirrored
display_HotPlugAtSuspend.extended
display_HotPlugAtSuspend.mirrored
display_LidCloseOpen.extended
display_Resolution.extended
display_Resolution.mirrored
display_SwitchMode

Dashboard view: https://screenshot.googleplex.com/6iiMTu6mPRy

pgangishetty@, can you test chell device with ext. monitor and try changing resolution?

Deleted: 220462296-chromeos-test%2Fchromeos2-row10-rack6-host5%2Fdisplay_LidCloseOpen.extended%2F021454-1920x1080-diff.png 4.5 KB

	220462296-chromeos-test%2Fchromeos2-row10-rack6-host5%2Fdisplay_LidCloseOpen.extended%2F021454-1920x1080-diff.png 4.5 KB View Download

+chameleon-Fixit label

All 5 hosts in lab are affected. Looks like a product issue.
Revoving chameleon-Fixit label.

Started with build M70-10906.0.0 / 70.0.3501.0 and the diffs to look for a change causing it are:
CrOs: https://crosland.corp.google.com/log/10905.0.0..10906.0.0
Chrome: https://chromium.googlesource.com/chromium/src/+log/70.0.3500.0..70.0.3501.0?n=10000

pshoma@, marcheu@, can you please check if any of the changes are to blame?


pgangishetty@, can you test two chell boards against same external display
- one device with M70-10906.0.0 / 70.0.3501.0
- one device with M70-10905.0.0 / 70.0.3500.0
and compare if there is a noticeable change?

+ some more folks

Re: #3 - Yes, I do see noticeable change on the external display when tested on:
- one device with M70-10906.0.0 / 70.0.3501.0 (img 10906_0_0.jpg)
- one device with M70-10905.0.0 / 70.0.3500.0 (img 10905_0_0.jpg)

Images present here: - https://pantheon.corp.google.com/storage/browser/chromiumos-test-logs/bugfiles/cr/867652

Wow that's much different, no wonder tests are failing.
Thanks for testing manually and confirming. Nice pictures.

Could that be due to  issue 848540 ?

The revert https://chromium-review.googlesource.com/c/chromium/src/+/1146782 from  issue 848540  landed on chrome 70.0.3501.0, where the failure began.

+dcastagna@ as owner

Can anyone confirm this is now fixed and mark fixed if so?

The tests are passing now - https://screenshot.googleplex.com/wVK29DGHwzi - since M70 - 11017.0.0 / 70.0.3532.0 

Need merging to M69

Merge approved, M69.

Tests are passing now on M69 since build 10895.47.0.
Screenshot: https://screenshot.googleplex.com/DKdhgkbfSHL

marked as verified.

This issue has been approved for a merge. Please merge the fix to any appropriate branches as soon as possible!

If all merges have been completed, please remove any remaining Merge-Approved labels from this issue.

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