Public bug reported:
[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
** Affects: hwe-next
Importance: Undecided
Status: New
** Affects: linux (Ubuntu)
Importance: Undecided
Status: Invalid
** Affects: linux (Ubuntu Focal)
Importance: Undecided
Assignee: AceLan Kao (acelankao)
Status: In Progress
** Tags: oem-priority originate-from-1867863 somerville
** Also affects: linux (Ubuntu Focal)
Importance: Undecided
Status: New
** Also affects: linux-oem-5.6 (Ubuntu)
Importance: Undecided
Status: New
** Changed in: linux (Ubuntu Focal)
Assignee: (unassigned) => AceLan Kao (acelankao)
** Changed in: linux-oem-5.6 (Ubuntu Focal)
Assignee: (unassigned) => AceLan Kao (acelankao)
** Changed in: linux (Ubuntu)
Status: New => Invalid
** Changed in: linux-oem-5.6 (Ubuntu)
Status: New => Invalid
** Changed in: linux (Ubuntu Focal)
Status: New => In Progress
** Changed in: linux-oem-5.6 (Ubuntu Focal)
Status: New => In Progress
** Tags added: oem-priority originate-from-1867863 somerville
** No longer affects: linux-oem-5.6 (Ubuntu)
** No longer affects: linux-oem-5.6 (Ubuntu Focal)
** Description changed:
[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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https://bugs.launchpad.net/bugs/1877013
Title:
Dell XPS 13 9300 mirror mode doesn't work sometimes with WD19TB
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