Hi Xiaoyang,
Could you please install the debugging version of xorg and attach
debugging information? See:
https://help.ubuntu.com/community/DebuggingXAutoconfiguration and
https://wiki.ubuntu.com/DebuggingXorg for details.
** Changed in: xorg (Ubuntu)
Importance: Undecided => Low
Status: New => Incomplete
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It does not refresh well when dragging a window in the rotated screen
https://bugs.launchpad.net/bugs/129380
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