Edit: This post was full of incorrect conclusions. Here's the corrected version. So it turns out kmscube does work just fine, and using X remotely (via x2go, which is what I'm doing to enjoy CodeLite as an IDE on this project) has nothing to do with it. The secret sauce is that kmscube (and, presuma...

Thanks for the informative response. Unfortunately, that demo doesn't work on my Pi. It just prints out lots of info about the EGL and GLES environment, and then an error message. The specific error varies based on whether I tell it which device to use. Specifying no device, it ends with "Using modi...

Hi folks, I am working with a 2GB Raspberry Pi 4 with the very latest edition of the OS which was shipped with the Pi kit I bought (Debian 10.2, kernel 4.19.75-v7l+). Long long ago (around the time of the first Pi Zero IIRC), I succeeded in getting GLES functional in a command-line environment witho...

An update: I've isolated the communication issue to the bad (IMHO) chip select behavior. The external UART requires a high pulse on chip select to separate commands; otherwise it never reloads its output shift register, and sends the same response byte over and over. I can work around the problem by...

Hi, I'm troubleshooting a failed SPI communication between the RasPi 3 and an external UART. The symptom is that the UART is not responding to anything at all (the MISO line stays high, so all data read by the Pi is 0xFF). At this stage I have not ruled out anything yet, but I did notice something s...

On "which button do you press?": If you're "suspended" (aka sleep, aka suspend-to-RAM, aka low power on state), you're...well, you're in trouble unless you had a USB keyboard connected and USB is still awake. BUT! If you're "hibernated" (aka suspend-to-disk, aka power off state), all you have to do ...

There's a brief mention in this thread of the I2C channel inside the HDMI interface. The fellow that mentions it clearly knows way more about the entire subject than I do... Is it possible to access that I2C bus from Linux user-space? My goal is to use the bus to control a connected display's backli...