This article supports the developer to get a Raspberry to work in vertical mode. There are many documents but also found problems to get the rotate mode to work with Raspbian.
Raspberry Rev A or B Raspbian OS
For rotate in vertical you can try:
display_rotate=1 90 degrees
If does not work, specifically you may find this with Rev B and a lot of threads, including threads talking about Safe Mode. But simply try:
apt-get update apt-get upgrade
If does not work try:
apt-get install rpi-update rpi-update
If does not work
Please write to me — mgalli at telasocial dot com.
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