The reason for this instructable is to resolve a issue I was having with the new release of Raspberry Pi OS - JESSIE - Pixel and using HDMI 5" (800X480) display. Before the release of Jessie 800 X 480 display worked well when adjustments were made to the "config.txt" file. These changes were well documented at Adafruit as well as some Instructables that addressed this situation. The only problem that I ran into was that changes once made to the "config.txt" and the Pi rebooted the 1280 X 800 would display nothing would work fine on the 800 X 480 display. Not a real problem if a person only used the 800 X 480 displays, so the issue really was that you could not go back and forth between displays. A major pain if a person was doing a lot of testing and trouble shooting of hardware and different configurations.
All of the displays I have purchased were from Adafruit. So once my displays did not work correctly any longer I contact Adafruit's tech support for a solution.
Adafruit's solution was to go to Raspberry Pi forums and seek help there because they had a solution in the tech support documentation section in support of this display that was a non-Jessie with Pixel solution. I did post the same request with the Raspberry Pi Forums with no responses to the problem or any hints on where to seek help on this issue.
See the second photo for the actual exchange with the support of this product.
This response was very surprising to me because the 5" HDMI Backpack display is a actual Adafruit product, it was not some third party product that they were just stocking. It seemed that tech support was not going to spend any time to investigate the problem and help resolve why the displays would not work correctly with the upgrade Raspberry Pi Jessie with Pixel that is upgrade each time a person requests an update or upgrade as instructed in almost all sites and instructions when using a Raspberry Pi. This was a major problem for me as I purchased a number of these displays and were shipped all over the us and now none of them would work correctly. Needless to say I need a solution to solve this major issue for me.
All the documentation for the 5" HDMI Backpak display was no longer of use to me and my users and in my mind Adafruit needs to change what they are telling people in support of this product.
That being said I have now found a solution that is a much better one for me and is being documented here for others to learn and benefit from hopefully.
Understanding the issue of 800 X 480 5" display - Raspberry Pi - Jessie - Pixel UPGRADE:
This clip will help with understanding the problem of using a 800 X 480 5' HDMI display with Raspberry Pi - Jessie
Here is the link: