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[Zhang Weiwu <zhangweiwu@xxxxxxxxxx>]

I won't report again with latest kernel because (from my experience) I
do not expect it to be solved (or that it solved because of people
reporting bugs), but I still provide the following information to save
the time for those who wish to find a workaround - I do not know a
workaround, but I know the following would not work:

The following methods would not prevent the desktop to rotate automatically after login:
- delete /lib/udev/accelerometer
- comment out the only line in /lib/udev/rules.d/61-accelerometer.rules

Since the rotate-after-login does not alter input matrix, which is still
horizental, touch-screen will be useless right after login, until you
rotate the screen back (with xrandr -o randr). If, instead of preventing
auto-rotate-after-login, you wish to rotate input matrix as well to make
the machine at least usable, the following command would not work:

$ xinput set-prop 9 --type=float "Coordinate Transformation Matrix" 0 -1
1 1 0 0 0 0 1

The effect of that command is zero: input matrix remain the same
(horizental) while the screen is auto-rotated to vertical.

If you wish to study the issue, a starting point is the accelerometer device, which can be found in
/proc/bus/input/devices

Find out the event device (in my case event4) then you can find out which driver drives it by:
$ cat /sys/devices/platform/asus_laptop/input/input4/device/driver

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https://bugs.launchpad.net/bugs/1326885

Title:
  desktop start rotated

Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  Running Ubuntu 14.04 on bModo12 (same hardware as WeTab). Right after
  login the screen rotates to rightwards (no matter what direction the
  screen is actually at). I had to run this everytime:

  $ xrandr -o normal

  Note this is not gravity sensor at work. If gravity sensor is at work,
  and turned screen leftwards or rightwards, 'xrandr -o normal' will not
  have any effect.

  Expected behaviour: the desktop rotation should be decided by gravity sensor, or, without its input, defaults to normal. If it is intended that even without gravity sensor input the desktop should rotate anyway (because it consider itself running on a tablet) then it should do so since login screen, not to change orientation right after login.
  ---
  ApportVersion: 2.14.1-0ubuntu3.2
  Architecture: amd64
  CurrentDesktop: Unity
  DistroRelease: Ubuntu 14.04
  InstallationDate: Installed on 2014-04-28 (38 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
  Package: linux (not installed)
  Tags:  trusty
  Uname: Linux 3.15.0-031500rc5-generic x86_64
  UnreportableReason: The running kernel is not an Ubuntu kernel
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
  _MarkForUpload: True

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