A few days ago i received my new Dell XPS 12 convertible ultrabook / tablet. I noticed, in tablet mode sometimes the screen quits auto-rotate and the auto-rotate on/off-button becomes inresponsive. I have to go to display settings manually and Switch back to 0 degress or do a reboot.
How-I-fixed-it:
Following the hints by guy_mx99 in this thread, i let Windows Update do a manual search on available updates. Under optional updates there were also listed 3 Windows 8.1 Drivers. After installing all optional updates Auto-Rotation now seems to work OK.
I noticed, the issue is discussed in some Forums already, so here are the links i found so far on this issue.
http://en.community.dell.com/support-forums/laptop/f/3518/p/19493100/20512873.aspx#20512873
http://en.community.dell.com/support-forums/laptop/f/3518/p/19528623/20500967.aspx
http://commweb-ps3.us.dell.com/support-forums/laptop/f/3518/p/19537377/20497975.aspx
http://answers.microsoft.com/en-us/windows/forum/windows8_1-hardware/switching-between-tablet-and-laptop-mode-on-dell/6908176b-1a4b-4399-a6d8-766e3331ce4a
http://answers.microsoft.com/en-us/windows/forum/windows8_1-hardware/screen-rotation-dont-work-propertly-on-xps-12-9q33/eff977a1-e1f4-4c91-ae4d-e6ca3e78d858
http://en.community.dell.com/support-forums/laptop/f/3518/p/20497926/reply.aspx
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