Description of problem: On my Lenovo Yoga 900, Gnome accelerometer response is very twitchy and tablet mode is completely broken. Unless I use screen orientation lock from the system tray menu, the display flickers and attempts to reorient itself constantly. Also, trying to flip the computer over to use it in tablet mode is broken. Trying to use it vertically as a tablet just produces a black screen, and trying to flip it over horizontally makes everything upside down. Version-Release number of selected component (if applicable): 3.26.0-3 How reproducible: Move the laptop around and observe that the screen flickers on and off as you are using it unless rotation lock is on. Note that trying to use it vertically as a tablet is impossible because the screen goes blank and flipping it over horizontally makes the screen orientation upside down.
I just tried the Gnome on Xorg session and it's messed up even worse, especially without the rotation lock on. The laptop sometimes ends up in tablet mode, but bumping it even a little bit can cause the shell to go crazy and end up doing just about anything. Sometimes it even ends up with the Gnome top bar on the bottom of the screen, but to interact with it, you have to move the mouse to the top and click on where things *should* be. Even then I couldn't log out and ended up having to drop to the console to kill the Gnome session.
I've also got this problem with a Yoga 900. Screen starts upside-down, then rotates seemingly at random. Eventually when I hold the laptop upside-down for a while it'll have the correct orientation, and I can hit the rotation-lock button and use the thing. This started as soon as I updated to F27. My kernel version is 4.13.5-300.fc27.x86_64. Bug 1494692 is likely the same thing, or at least related.
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Fedora 27 changed to end-of-life (EOL) status on 2018-11-30. Fedora 27 is no longer maintained, which means that it will not receive any further security or bug fix updates. As a result we are closing this bug. If you can reproduce this bug against a currently maintained version of Fedora please feel free to reopen this bug against that version. If you are unable to reopen this bug, please file a new report against the current release. If you experience problems, please add a comment to this bug. Thank you for reporting this bug and we are sorry it could not be fixed.