There is no way of rotating the desktop easily when using a laptop as a portrait tablet; there needs to be: 1 an easy to use shortcut 2 a widget that can be used to do this 3 an action triggered by the gyro in a tablet. 1 & 2 seem easy, 3 but be more tricky.
We can't have multiple issues reported in one bug; see https://community.kde.org/Get_Involved/Bug_Reporting#One_issue_per_bug_report #3 is covered by Bug 384066. Please feel free to file separate bugs for #1 and #2. *** This bug has been marked as a duplicate of bug 384066 ***