[Bug 1877013] Autopkgtest regression report (linux-oracle-5.4/5.4.0-1019.19~18.04.1)

All autopkgtests for the newly accepted linux-oracle-5.4 (5.4.0-1019.19~18.04.1) for bionic have finished running.
The following regressions have been reported in tests triggered by the package:

zfs-linux/unknown (armhf)


Please visit the excuses page listed below and investigate the failures, proceeding afterwards as per the StableReleaseUpdates policy regarding autopkgtest regressions [1].

https://people.canonical.com/~ubuntu-archive/proposed-
migration/bionic/update_excuses.html#linux-oracle-5.4

[1] https://wiki.ubuntu.com/StableReleaseUpdates#Autopkgtest_Regressions

Thank you!

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https://bugs.launchpad.net/bugs/1877013

Title:
Dell XPS 13 9300 mirror mode doesn't work sometimes with WD19TB

Status in HWE Next:
New
Status in linux package in Ubuntu:
Invalid
Status in linux source package in Focal:
Fix Released

Bug description:
[Impact]
Connect HDMI monitor on WD19TB dock and connect WD19TB to Dell XPS 13 9300, toggling the display mode to mirror sometimes got a blank screen on external monitor.

[Fix]
After bisect kernel and found below commit(from v5.7-rc2) improves the stability
bcad588dea53 drm/i915/perf: Do not clear pollin for small user read buffers

[Test]
Verified on Dell XPS 13 9300 with WD19TB docking station, the fail rate becomes from 1/2 to 1/30

[Regression Potential]
Low, this commit has been CC'd to stable, so we will have this soon.

[Misc]
OEM-5.6 has this commit from v5.6.6 stable update

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