looking at device '/devices/pci0000:00/0000:00:01.0/drm/card0':
    KERNEL=="card0"
    SUBSYSTEM=="drm"
    DRIVER==""

  looking at parent device '/devices/pci0000:00/0000:00:01.0':
    KERNELS=="0000:00:01.0"
    SUBSYSTEMS=="pci"
    DRIVERS=="radeon"
    ATTRS{boot_vga}=="1"
    ATTRS{broken_parity_status}=="0"
    ATTRS{class}=="0x030000"
    ATTRS{consistent_dma_mask_bits}=="40"
    ATTRS{d3cold_allowed}=="1"
    ATTRS{device}=="0x990d"
    ATTRS{dma_mask_bits}=="40"
    ATTRS{driver_override}=="(null)"
    ATTRS{enable}=="1"
    ATTRS{irq}=="31"
    ATTRS{local_cpulist}=="0-3"
    ATTRS{local_cpus}=="f"
    ATTRS{msi_bus}=="1"
    ATTRS{power_dpm_force_performance_level}=="auto"
    ATTRS{power_dpm_state}=="balanced"
    ATTRS{power_method}=="dpm"
    ATTRS{power_profile}=="default"
    ATTRS{subsystem_device}=="0x080f"
    ATTRS{subsystem_vendor}=="0x1025"
    ATTRS{vendor}=="0x1002"

  looking at parent device '/devices/pci0000:00':
    KERNELS=="pci0000:00"
    SUBSYSTEMS==""
    DRIVERS==""

_________________________________________________________________________________________________________________________

  looking at device '/devices/pci0000:00/0000:00:02.0/0000:01:00.0/drm/card1':
    KERNEL=="card1"
    SUBSYSTEM=="drm"
    DRIVER==""

  looking at parent device '/devices/pci0000:00/0000:00:02.0/0000:01:00.0':
    KERNELS=="0000:01:00.0"
    SUBSYSTEMS=="pci"
    DRIVERS=="radeon"
    ATTRS{boot_vga}=="0"
    ATTRS{broken_parity_status}=="0"
    ATTRS{class}=="0x030000"
    ATTRS{consistent_dma_mask_bits}=="40"
    ATTRS{d3cold_allowed}=="1"
    ATTRS{device}=="0x6600"
    ATTRS{dma_mask_bits}=="40"
    ATTRS{driver_override}=="(null)"
    ATTRS{enable}=="0"
    ATTRS{irq}=="33"
    ATTRS{local_cpulist}=="0-3"
    ATTRS{local_cpus}=="f"
    ATTRS{msi_bus}=="1"
    ATTRS{power_dpm_force_performance_level}=="off"
    ATTRS{power_dpm_state}=="balanced"
    ATTRS{power_method}=="dpm"
    ATTRS{power_profile}=="default"
    ATTRS{subsystem_device}=="0x080f"
    ATTRS{subsystem_vendor}=="0x1025"
    ATTRS{vendor}=="0x1002"

  looking at parent device '/devices/pci0000:00/0000:00:02.0':
    KERNELS=="0000:00:02.0"
    SUBSYSTEMS=="pci"
    DRIVERS=="pcieport"
    ATTRS{broken_parity_status}=="0"
    ATTRS{class}=="0x060400"
    ATTRS{consistent_dma_mask_bits}=="32"
    ATTRS{d3cold_allowed}=="1"
    ATTRS{device}=="0x1412"
    ATTRS{dma_mask_bits}=="32"
    ATTRS{driver_override}=="(null)"
    ATTRS{enable}=="1"
    ATTRS{irq}=="18"
    ATTRS{local_cpulist}=="0-3"
    ATTRS{local_cpus}=="f"
    ATTRS{msi_bus}=="1"
    ATTRS{subsystem_device}=="0x1234"
    ATTRS{subsystem_vendor}=="0x1022"
    ATTRS{vendor}=="0x1022"

  looking at parent device '/devices/pci0000:00':
    KERNELS=="pci0000:00"
    SUBSYSTEMS==""
    DRIVERS==""