Man pages matching name siliconmotion in section 4:

siliconmotion.4.en	debian 10 / xserver-xorg-video-siliconmotion
siliconmotion.4.en	debian 11 / xserver-xorg-video-siliconmotion
siliconmotion.4.en	debian 12 / xserver-xorg-video-siliconmotion