Hi Daniel,
After logging with wayland, this bug is gone. Thanks for confirmation.
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https://bugs.launchpad.net/bugs/1871997
Title:
The primary display will cause black
** Attachment added: "journal.log"
https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1871997/+attachment/5351890/+files/journal.log
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https://bugs.launchpad.net/bugs/1871997
This following message could happen when I repeated to switch landscape/flipped
mode sometimes, but not always happened:
[ 3123.471] (WW) modeset(0): flip queue failed: Device or resource busy
[ 3123.471] (WW) modeset(0): Page flip failed: Device or resource busy
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You received this bug
Public bug reported:
The primary (built-in) display will cause black screen when external 4K
monitor is configured to flipped
Steps to reproduce:
1. plug 4K monitor via HDMI
2. open gnome-control-center
3. select Displays -> Orientation -> Landscape (flipped)
4. apply
5. black screen on built-in
This is a simple patch to fix this issue for sna / uxa mode and tested
on UMA / discrete card.
** Patch added: fix-no-backlight.patch
https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/1373776/+attachment/4245974/+files/fix-no-backlight.patch
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