4k with a Raspberry Pi 2 Model B? Yes please!
If you're a Raspberry Pi nerd like me, you'll know that one of the biggest selling features of the newest Raspberry Pi 4 is its ability to natively output to two 4k displays. This is a huge upgrade over the Pi 3, which only officially outputs 1080p to a single display.
As with many things Pi, it can be hacked into doing things it's not officially spec'd to do. It is possible to get a Pi 3 to output 4k with some additions to config.txt. Since both the Pi 2 and Pi 3 both share the same GPU chipset, I was wondering if a Pi 2 could also be made to output 4k.
A little bit of Google research took me to this thread which confirmed that is is indeed possible, but with some caveats:
- You won't get 30 FPS. Period. 15 fps can be achieved without overclocking, and there are mixed reports that say you need to overclock in order to get above 20. According to what I've been able to find, the Pi 2 taps out at about 28 FPS as the absolute maximum frame rate you can expect, even when overclocked.
- Even though you can set the desktop resolution to 3840x2160, it doesn't appear possible to decode a 4k video file at native resolution. Given the frame rates you can expect, not sure you'd want to do this anyway.
Worth a try? You bet!
disable_overscan=1hdmi_ignore_edid=0xa5000080hdmi_cvt 3840 2160 15framebuffer_width=3840framebuffer_height=2160hdmi_group=2hdmi_mode=87hdmi_pixel_freq_limit=400000000max_framebuffer_width=3840max_framebuffer_height=2160
disable_overscan=1framebuffer_width=3840framebuffer_height=2160max_framebuffer_width=3840max_framebuffer_height=2160hdmi_ignore_edid=0xa5000080hdmi_pixel_freq_limit=400000000hdmi_group=2hdmi_mode=87hdmi_timings=3840 1 48 32 80 2160 1 3 5 54 0 0 0 24 0 211190000 3gpu_mem=256