What exactly do you mean by the very latest firmware? I'm observing the same problem with setting core_freq=600.
Core freq and GPU freq are different things. You should be able to set GPU frequency.fik wrote: ↑Thu Mar 26, 2020 7:49 amWhat exactly do you mean by the very latest firmware? I'm observing the same problem with setting core_freq=600.
vcgencmd measure_clock core shows only 500 for current raspberrypi-kernel-1.20200212-1 (4.19.97-v8+ #1294) and also for today's rpi-update (4.19.108-v8+ #1298).
However, for the randomly backed up version (created by rpi-update on 15-Aug 2019) it works. It seems that the latest firmwares lost the overclocking ability.
Core freq was not granular enough - if you want to overclock parts of the GPU, rather than just the overriding core option, you can still do that, and the are various options to do so. See the Overclocking page.fik wrote: ↑Fri Jun 05, 2020 12:59 pmNow the doc was updated and you actually can't change core_freq directly on Pi4, but you can use hdmi_enable_4kp60 to get 550MHz.
https://www.raspberrypi.org/documentati ... locking.md