** Changed in: linux (Ubuntu Focal)
Status: In Progress => Fix Committed
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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 Committed
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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