I have now reverted all the way back to the kernel I use on 18.04 (4.15) and the issue still happens.
The accelerometer position in both 18.04 and 19.04 (/sys/devices/platform/lis3lv02d/) read the same. Attached is a video of the moment when the flip occurs, just before the desktop loads. Sorry for filming the screen like a savage. ** Attachment added: "Video of screen flipping upside down" https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1821641/+attachment/5251051/+files/VID_20190330_185907_01.mp4 -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1821641 Title: [HP Elitebook 840 G1] Screen is upside down on 19.04 daily Status in linux package in Ubuntu: Incomplete Bug description: On the 19.04 daily image (2019-03-24), the screen on my laptop is completely upside down, from the moment the GUI loads. This does not happen on 18.04 and 18.10. It appears to be an accelerometer issue since holding the laptop upside down flips the image to its correct orientation - basically the functionality of the accelerometer is suddenly inverted. Please contact me if you want me to help testing the issue on my hardware. Thanks! To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1821641/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp