Hi Jon, On Tue, 18 Jan 2022 17:26:03 -0800, Jon P wrote: > After updating to a 5700G APU from a 2400G on my B450 board I am not > able to access i2c interfaces which is a blocking issue to use OpenRGB > on the DRAM and motherboard RGB controller (I am one of the developers > of OpenRGB). > > I have opened an issue with the distribution that I am using and > multiple other users are seeing the same issue but I have not seen any > updates on the issue or request for more details so I am afraid that > it has just gone into the void. Full details here: > https://bugs.launchpad.net/bugs/1950062 > > I see the same issues when using the i2c-tools as well when I am > trying to read the DRAM so following the man page I would like to > report a bug using the i2c-tools with AMD Cezanne APU's. >From your logs, the i2c bus itself is not working. So this is definitely not an i2c-tools issue, but a kernel driver issue. Most likely this is related to the required change of register access method for recent AMD chipsets which has been discussed recently: https://lore.kernel.org/linux-i2c/20220118221152.300444-1-terry.bowman@xxxxxxx/T/#t -- Jean Delvare SUSE L3 Support
