Rotation
Rotation allows you to change the screen orientation between landscape and portrait to all 4 cardinal directions. You may wish to do this to better view a long page of text, allow for easier left-handed operation, for easier reading of certain websites, or a variety of other purposes.
Unfortunately, rotation support isn't bundled with Maemo even though the tablets support hardware screen rotation. Fortunately, installing the necessary packages for rotation support is a relatively easy process.
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Installing
First, make sure you know what you're doing! Although the steps outlined here are easy to follow and mostly safe, you are working with important system files, and a careless misstep could leaving you in need of a reflash.
These instructions only work for Diablo, and specifically version 5.2008.43-7, so make sure your system is completely up-to-date, and make sure Extras is enabled. Then you will need to get root access, open XTerm and become root.
There are two slightly different sets of packages for the N800 and the N810, so follow the appropriate steps for your device.
N800
Run this command in XTerm as root:
apt-get install advanced-backlight osso-software-version-rx34-unlocked
N810
Run this command in XTerm as root:
apt-get install advanced-backlight osso-software-version-rx44-unlocked
N810W
This should work, but is (as far as I know) untested. If you do it (and it works), please remove this notice. Run this command in XTerm as root:
apt-get install advanced-backlight osso-software-version-rx48-unlocked
For both devices
This section untested on N810W. If this kernel is correct for N810W, remove this notice... After following the appropriate steps for your device, continue and run:
maemo-mini-curl -o kernel-diablo-flasher_2.6.21-200842maemo1rotationfast_all.deb http://outpo.st/rotate/kernel-diablo-flasher_2.6.21-200842maemo1rotationfast_all.deb maemo-mini-curl -o xserver-xomap_1.3.99.0~git20070321-0osso20083801rotation_armel.deb http://outpo.st/rotate/xserver-xomap_1.3.99.0~git20070321-0osso20083801rotation_armel.deb dpkg -i kernel-diablo-flasher_2.6.21-200842maemo1rotationfast_all.deb xserver-xomap_1.3.99.0~git20070321-0osso20083801rotation_armel.deb
Reboot, make sure Advanced Backlight is enabled (Control panel -> Panels -> Status bar) and rotate using the selection in Advanced Backlight from your status bar.