External displays currently do not work on devices with the Mediatek MT8183 chip. Recently, this functionality was added to Postmarket OS (https://wiki.postmarketos.org/wiki/Lenovo_IdeaPad_Duet_Chromebook_(google-krane)#HDMI_out). So in principle, this should also be possible under Cadmium
I ran a quick check by just applying the Patch from Postmarket OS (https://gitlab.postmarketos.org/postmarketOS/pmaports/-/merge_requests/6358) on the Kernel 6.15.8, but the device would not boot. So probably a bit more work is required but this might be a good starting point.
External displays currently do not work on devices with the Mediatek MT8183 chip. Recently, this functionality was added to Postmarket OS (https://wiki.postmarketos.org/wiki/Lenovo_IdeaPad_Duet_Chromebook_(google-krane)#HDMI_out). So in principle, this should also be possible under Cadmium
I ran a quick check by just applying the Patch from Postmarket OS (https://gitlab.postmarketos.org/postmarketOS/pmaports/-/merge_requests/6358) on the Kernel 6.15.8, but the device would not boot. So probably a bit more work is required but this might be a good starting point.