$ awk -v P=xorg-video-abi-15  '/^Package:/{PKG=$0} index($0,P) > 0 {print PKG, "provides", P}' /mnt/target/var/lib/dpkg/status
Package: xserver-xorg-video-sis provides xorg-video-abi-15
Package: nvidia-340 provides xorg-video-abi-15
Package: nvidia-337 provides xorg-video-abi-15
Package: nvidia-331 provides xorg-video-abi-15
Package: xserver-xorg-core provides xorg-video-abi-15
Package: xserver-xorg-video-openchrome provides xorg-video-abi-15
Package: xserver-xorg-video-vmware provides xorg-video-abi-15
Package: xserver-xorg-video-radeon provides xorg-video-abi-15
Package: xserver-xorg-video-qxl provides xorg-video-abi-15
Package: xserver-xorg-video-savage provides xorg-video-abi-15
Package: xserver-xorg-video-fbdev provides xorg-video-abi-15
Package: xserver-xorg-video-glamoregl provides xorg-video-abi-15
Package: xserver-xorg-video-vesa provides xorg-video-abi-15
Package: xserver-xorg-video-sisusb provides xorg-video-abi-15
Package: xserver-xorg-video-tdfx provides xorg-video-abi-15
Package: xserver-xorg-video-cirrus provides xorg-video-abi-15
Package: xserver-xorg-video-r128 provides xorg-video-abi-15
Package: xserver-xorg-video-neomagic provides xorg-video-abi-15
Package: xserver-xorg-video-modesetting provides xorg-video-abi-15
Package: xserver-xorg-video-nouveau provides xorg-video-abi-15
Package: xserver-xorg-video-mga provides xorg-video-abi-15
Package: xserver-xorg-video-s3 provides xorg-video-abi-15
Package: xserver-xorg-video-trident provides xorg-video-abi-15
Package: xserver-xorg-video-intel provides xorg-video-abi-15
Package: xserver-xorg-video-mach64 provides xorg-video-abi-15
Package: xserver-xorg-video-ati provides xorg-video-abi-15
Package: xserver-xorg-video-siliconmotion provides xorg-video-abi-15