[tshering]

Originally Posted by frostschutz

Because for some strange reason, the value you set is the opposite of the value you get. So you set $originalrotation but get its opposite; cat rotate > rotate then sets the opposite and gets $originalrotation.

Thank you for the answer. This seems not be the case on the Glo, for instance.

Spoiler:

(none) login: root
[root@(none) ~]# cat /sys/class/graphics/fb0/rotate
0
[root@(none) ~]# echo 1 > /sys/class/graphics/fb0/rotate
[root@(none) ~]# cat /sys/class/graphics/fb0/rotate
1
[root@(none) ~]# echo 0 > /sys/class/graphics/fb0/rotate
[root@(none) ~]# cat /sys/class/graphics/fb0/rotate
0
[root@(none) ~]# cat /sys/class/graphics/fb0/rotate > /sys/class/graphics/fb0/ro
tate
[root@(none) ~]# cat /sys/class/graphics/fb0/rotate
0
[root@(none) ~]# # I started at this point nickel on the reader
[root@(none) ~]# cat /sys/class/graphics/fb0/rotate
3
[root@(none) ~]# echo 0 > /sys/class/graphics/fb0/rotate
[root@(none) ~]# cat /sys/class/graphics/fb0/rotate
0
[root@(none) ~]# echo 3 > /sys/class/graphics/fb0/rotate
[root@(none) ~]# cat /sys/class/graphics/fb0/rotate
3