Thanks for the info, will take a look. Also just to clarify, this is the first party AMD 7900 XTX, not a third party AIB (e.g. Sapphire, ASRock, etc).
On Tuesday, January 9th, 2024 at 3:02 AM, Christian König <ckoenig.leichtzumer...@gmail.com> wrote: > > > Am 08.01.24 um 23:32 schrieb Deucher, Alexander: > > > [Public] > > > > > -----Original Message----- > > > From: amd-gfx amd-gfx-boun...@lists.freedesktop.org On Behalf Of > > > Alexander Koskovich > > > Sent: Sunday, January 7, 2024 11:19 PM > > > To: amd-gfx@lists.freedesktop.org > > > 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. > > > > It might also be a good idea to look some of the ATOMBIOS tables found > on your device. > > Those tables are filled in by the AIB/OEM with the information which > connectors (HDMI, DVI, DP etc...) are on the board and I bet that the > information which RGB controller is used and where to find it is > somewhere in there as well. > > Adding Harry from our display team, might be that he has some more hints > as well. > > Christian. > > > Alex
