since a few days I'm a proud owner of a RPi Model B+ and a 2,8" RPi-Display from Watterott. HDMI output works fine, I am using a preinstalled Raspbian that boots into desktop.
I followed this tutorial to set up the display.
As soon as I get to Step 3: Activate Framebuffer, the displays's backlight turns on, but nothing more.
con2fbmap 1 1 does absolutely nothing,
FRAMEBUFFER=/dev/fb1 startx & lets the HDMI output disappear for a few seconds, and then returns with all programs closed.
Any ideas what could be the problem? Apparently I am a rather new to the linux world.
When I use rpi-fbcp (github.com/tasanakorn/rpi-fbcp) to simply mirror the HDMI output to the display, it works, so the hardware seems to be fine.