[Bug 110511] New: i915 flickering in new XPS13 9380 (2019)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=110511

            Bug ID: 110511
           Summary: i915 flickering in new XPS13 9380 (2019)
           Product: DRI
           Version: XOrg git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: paulo at matos-sorge.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 144092
  --> https://bugs.freedesktop.org/attachment.cgi?id=144092&action=edit
dmesg from boot

This was previously reported here:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1826125

Brand new XPS 13 9380 arrived a couple of days ago from Dell with Ubuntu 18.04
preinstalled.

Flickering started immediatelly post boot and it was constant.
I updated BIOS from 1.1.1 to 1.2.1, tried i915.fastboot and i915.enable_rc6
combinations to no avail. 

Updated to Ubuntu 19.04 and kernel-5 to no avail. However flickering changed
from constant to only if there's a screen refresh.

Videos pre kernel 5:
https://photos.app.goo.gl/1PkL2HrjMBP41aML9
https://photos.app.goo.gl/CMzmMwrCPH5wh8aw6

Videos post kernel 5:
https://photos.app.goo.gl/tpmTGWVJXpChoERz6

I attach dmesg from boot.

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