I have a Pi 2 and decided to check the new experimental OpenGL driver available in the latest version of Raspbian Jessie. Alas! the thing is really buggy. After enabling it my Pi, (through
raspi-config) no longer boots and the connected official 7" Pi display shows only the initial colorful square but nothing after that. After reading online it seems that in order for the Pi to boot after enabling the GL driver a display has to be connected to the HDMI. Nice...
So in order to avoid attaching and detaching my desktop display I decide to check if I can disable the GL driver by simply editing X and Y files on the SD card from my notebook.
The problem is that I have no idea which setting (or even settings!) the enabling of the GL driver has triggered so I haven't got a clue which configuration file (or files) I have to edit.
Searching online gave me no fruitful results so I'm asking here hoping that I can resolve this issue.
PS: As mentioned I do have a HDMI screen however knowing which settings the
raspi-config actually changes would be really helpful not only for the situation described in this post.