Currently the reference cooler from AMD does not have an existing RGB controller for OpenRGB, that's why I was looking for documentation on the I2C commands to send to the second SMU, so I don't risk bricking my card by sending wrong commands during development somehow.
writeSetCMDWithData: ************************************************************** adli2c.iSize = sizeof(ADLI2C) adli2c.iAction = ADL_DL_I2C_ACTIONWRITE adli2c.iAddress = 0xb4 adli2c.iSpeed = 100 0 -------------------------------------------------- Dev 0: ADL_Display_WriteAndReadSMUI2C(0, &adli2c) = 0 adli2c.iDataSize = 24 i2cData[0]~[24] 40 51 2c 01 00 00 ff 00 ff ff ff cc 00 cc 00 00 00 ff ff ff ff ff ff ff >From the RGB app's logs this is an example of what the official AMD >application on Windows is sending when it changes colors on the RGB strip. >From this can it be assumed the AMD card is using the latter method you >mentioned with the second SMU I2C bus, in which case no driver changes would >be needed? On Monday, January 8th, 2024 at 5:32 PM, Deucher, Alexander <[email protected]> wrote: > > > [Public] > > > -----Original Message----- > > From: amd-gfx [email protected] On Behalf Of > > Alexander Koskovich > > Sent: Sunday, January 7, 2024 11:19 PM > > To: [email protected] > > Subject: Documentation for RGB strip on RX 7900 XTX (Reference) > > > > Hello, > > > > I was wondering if AMD would be able provide any documentation for the > > RGB strip on the reference cooler > > (https://www.amd.com/en/products/graphics/amd-radeon-rx-7900xtx)? It > > looks to be handled via I2C commands to the SMU, but having proper > > documentation would be extremely helpful. > > > It depends on the AIB/OEM and how they designed the specific board. The RGB > controller will either be attached to the DDCVGA i2c bus on the display > hardware or the second SMU i2c bus. The former will require changes to the > amdgpu display code to register display i2c buses that are not used by the > display connectors on the board so they can be used by 3rd party > applications. Currently we only register i2c buses used for display > connectors. The latter buses are already registered with the i2c subsystem > since they are used for other things like EEPROMs on server and workstation > cards and should be available via standard Linux i2c APIs. I'm not sure what > i2c LED controllers each AIB vendor uses off hand. > https://openrgb.org/index.html would probably be a good resource for that > information. > > Alex
