** Changed in: linux (Ubuntu Focal)
Status: New => Invalid
** Changed in: linux-oem-5.10 (Ubuntu Hirsute)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1910211
Title:
Fix the video can't output through WD19TB connected with TGL platform
during cold-boot
Status in HWE Next:
New
Status in linux package in Ubuntu:
In Progress
Status in linux-oem-5.10 package in Ubuntu:
Invalid
Status in linux source package in Focal:
Invalid
Status in linux-oem-5.10 source package in Focal:
Fix Released
Status in linux source package in Hirsute:
In Progress
Status in linux-oem-5.10 source package in Hirsute:
Invalid
Bug description:
[Impact]
After Apply the patches from
https://www.spinics.net/lists/intel-gfx/msg248700.html, the TGL platform would
have the failure rate(1/20) on outputting the video through WD19TB.
[Fix]
The patch is provided by
Imre(https://gitlab.freedesktop.org/drm/intel/-/issues/2801#note_740352).
If there's no lttpr in the link chain, the DRM driver wouldn't configure the
transparent mode again.
[Test Case]
1. Connected the WD19TB with the TGL platform and
connected the external monitor on WD19TB with HDMI/Displayport.
2. Don't plug the external monitor on the TGL platform, so there's only one
monitor on WD19TB.
3. Cold boot the TGL platform.
4. Check the monitor can be blinked and the video can output to the monitor.
[Where problems could occur]
As per Imre's comment, this may be caused by the dock.
In the future if the WD19TB's firmware is updated, we may encounter the same
issue again.
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