Regression for xbacklight: No outputs have backlight property

[Lasse]

I was running Ubuntu 16.04 and I used xbacklight frequently. Upon upgrading to 17.04 release candidate as of 13th of April, xbacklight stopped to work.

$ xbacklight -set 10
No outputs have backlight property

# lshw
foobar
    description: Laptop
    product: Latitude 3330 (Latitude 3330)
    vendor: Dell Inc.
    version: 01
    serial: 78J74Z1
    width: 64 bits
    capabilities: smbios-2.7 dmi-2.7 smp vsyscall32
    configuration: boot=normal chassis=laptop sku=Latitude 3330 uuid=44454C4C-3800-104A-8037-B7C04F345A31
  *-core
       description: Motherboard
       product: 07JYK1
       vendor: Dell Inc.
       physical id: 0
       version: A00
       serial: /78J74Z1/CN7620643T004K/
     *-firmware
          description: BIOS
          vendor: Dell Inc.
          physical id: 0
          version: A06
          date: 05/20/2015
          size: 64KiB
          capacity: 13MiB
          capabilities: pci pnp upgrade shadowing cdboot bootselect socketedrom edd int13floppy1200 int13floppy720 int13floppy2880 int5printscreen int9keyboard int14serial int17printer acpi usb smartbattery biosbootspecification netboot uefi
     *-cpu
          description: CPU
          product: Intel(R) Core(TM) i3-3217U CPU @ 1.80GHz
          vendor: Intel Corp.
          physical id: 50
          bus info: cpu@0
          version: Intel(R) Core(TM) i3-3217U CPU @ 1.80GHz
          slot: SOCKET 0
          size: 1256MHz
          capacity: 1800MHz
          width: 64 bits
          clock: 100MHz
          capabilities: x86-64 fpu fpu_exception wp vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx rdtscp constant_tsc arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc aperfmperf pni pclmulqdq dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr pdcm pcid sse4_1 sse4_2 x2apic popcnt tsc_deadline_timer xsave avx f16c lahf_lm epb tpr_shadow vnmi flexpriority ept vpid fsgsbase smep erms xsaveopt dtherm arat pln pts cpufreq
          configuration: cores=2 enabledcores=2 threads=4
        *-cache:0
             description: L2 cache
             physical id: 40
             slot: CPU Internal L2
             size: 512KiB
             capacity: 512KiB
             capabilities: internal write-through unified
             configuration: level=2
        *-cache:1
             description: L1 cache
             physical id: 41
             slot: CPU Internal L1
             size: 128KiB
             capacity: 128KiB
             capabilities: internal write-through data
             configuration: level=1
        *-cache:2
             description: L3 cache
             physical id: 42
             slot: CPU Internal L3
             size: 3MiB
             capacity: 3MiB
             capabilities: internal write-back unified
             configuration: level=3
     *-memory
          description: System Memory
          physical id: 43
          slot: System board or motherboard
          size: 4GiB
        *-bank:0
             description: DIMM [empty]
             product: [Empty]
             vendor: [Empty]
             physical id: 0
             serial: [Empty]
             slot: DIMM A
        *-bank:1
             description: SODIMM DDR3 Synchronous 1600 MHz (0,6 ns)
             product: HMT451S6AFR8A-PB
             vendor: Hynix/Hyundai
             physical id: 1
             serial: 01434B8B
             slot: DIMM B
             size: 4GiB
             width: 64 bits
             clock: 1600MHz (0.6ns)
     *-pci
          description: Host bridge
          product: 3rd Gen Core processor DRAM Controller
          vendor: Intel Corporation
          physical id: 100
          bus info: pci@0000:00:00.0
          version: 09
          width: 32 bits
          clock: 33MHz
          configuration: driver=ivb_uncore
          resources: irq:0
        *-display
             description: VGA compatible controller
             product: 3rd Gen Core processor Graphics Controller
             vendor: Intel Corporation
             physical id: 2
             bus info: pci@0000:00:02.0
             version: 09
             width: 64 bits
             clock: 33MHz
             capabilities: msi pm vga_controller bus_master cap_list rom
             configuration: driver=i915 latency=0
             resources: irq:27 memory:f6c00000-f6ffffff memory:e0000000-efffffff ioport:f000(size=64) memory:c0000-dffff
        *-usb:0
             description: USB controller
             product: 7 Series/C210 Series Chipset Family USB xHCI Host Controller
             vendor: Intel Corporation
             physical id: 14
             bus info: pci@0000:00:14.0
             version: 04
             width: 64 bits
             clock: 33MHz
             capabilities: pm msi xhci bus_master cap_list
             configuration: driver=xhci_hcd latency=0
             resources: irq:24 memory:f7c20000-f7c2ffff
           *-usbhost:0
                product: xHCI Host Controller
                vendor: Linux 4.10.0-19-lowlatency xhci-hcd
                physical id: 0
                bus info: usb@3
                logical name: usb3
                version: 4.10
                capabilities: usb-2.00
                configuration: driver=hub slots=4 speed=480Mbit/s
           *-usbhost:1
                product: xHCI Host Controller
                vendor: Linux 4.10.0-19-lowlatency xhci-hcd
                physical id: 1
                bus info: usb@4
                logical name: usb4
                version: 4.10
                capabilities: usb-3.00
                configuration: driver=hub slots=4 speed=5000Mbit/s
        *-communication
             description: Communication controller
             product: 7 Series/C216 Chipset Family MEI Controller #1
             vendor: Intel Corporation
             physical id: 16
             bus info: pci@0000:00:16.0
             version: 04
             width: 64 bits
             clock: 33MHz
             capabilities: pm msi bus_master cap_list
             configuration: driver=mei_me latency=0
             resources: irq:28 memory:f7c3c000-f7c3c00f
        *-network
             description: Ethernet interface
             product: 82579LM Gigabit Network Connection
             vendor: Intel Corporation
             physical id: 19
             bus info: pci@0000:00:19.0
             logical name: eno1
             version: 04
             serial: e0:db:55:cb:8c:6a
             capacity: 1Gbit/s
             width: 32 bits
             clock: 33MHz
             capabilities: pm msi bus_master cap_list ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd 1000bt-fd autonegotiation
             configuration: autonegotiation=on broadcast=yes driver=e1000e driverversion=3.2.6-k firmware=0.15-4 latency=0 link=no multicast=yes port=twisted pair
             resources: irq:26 memory:f7c00000-f7c1ffff memory:f7c39000-f7c39fff ioport:f080(size=32)
        *-usb:1
             description: USB controller
             product: 7 Series/C216 Chipset Family USB Enhanced Host Controller #2
             vendor: Intel Corporation
             physical id: 1a
             bus info: pci@0000:00:1a.0
             version: 04
             width: 32 bits
             clock: 33MHz
             capabilities: pm debug ehci bus_master cap_list
             configuration: driver=ehci-pci latency=0
             resources: irq:16 memory:f7c38000-f7c383ff
           *-usbhost
                product: EHCI Host Controller
                vendor: Linux 4.10.0-19-lowlatency ehci_hcd
                physical id: 1
                bus info: usb@1
                logical name: usb1
                version: 4.10
                capabilities: usb-2.00
                configuration: driver=hub slots=2 speed=480Mbit/s
              *-usb
                   description: USB hub
                   product: Integrated Rate Matching Hub
                   vendor: Intel Corp.
                   physical id: 1
                   bus info: usb@1:1
                   version: 0.00
                   capabilities: usb-2.00
                   configuration: driver=hub slots=6 speed=480Mbit/s
                 *-usb
                      description: Video
                      product: Integrated_Webcam_HD
                      vendor: CNFCH41k104010020100
                      physical id: 5
                      bus info: usb@1:1.5
                      version: 37.04
                      serial: 0x0001
                      capabilities: usb-2.00
                      configuration: driver=uvcvideo maxpower=500mA speed=480Mbit/s
        *-multimedia
             description: Audio device
             product: 7 Series/C216 Chipset Family High Definition Audio Controller
             vendor: Intel Corporation
             physical id: 1b
             bus info: pci@0000:00:1b.0
             version: 04
             width: 64 bits
             clock: 33MHz
             capabilities: pm msi pciexpress bus_master cap_list
             configuration: driver=snd_hda_intel latency=0
             resources: irq:29 memory:f7c30000-f7c33fff
        *-pci:0
             description: PCI bridge
             product: 7 Series/C216 Chipset Family PCI Express Root Port 1
             vendor: Intel Corporation
             physical id: 1c
             bus info: pci@0000:00:1c.0
             version: c4
             width: 32 bits
             clock: 33MHz
             capabilities: pci pciexpress msi pm normal_decode bus_master cap_list
             configuration: driver=pcieport
             resources: irq:16
        *-pci:1
             description: PCI bridge
             product: 7 Series/C210 Series Chipset Family PCI Express Root Port 2
             vendor: Intel Corporation
             physical id: 1c.1
             bus info: pci@0000:00:1c.1
             version: c4
             width: 32 bits
             clock: 33MHz
             capabilities: pci pciexpress msi pm normal_decode bus_master cap_list
             configuration: driver=pcieport
             resources: irq:17 memory:f7b00000-f7bfffff
           *-network
                description: Wireless interface
                product: Centrino Advanced-N 6235
                vendor: Intel Corporation
                physical id: 0
                bus info: pci@0000:02:00.0
                logical name: wlp2s0
                version: 24
                serial: 4a:12:c4:3c:68:d7
                width: 64 bits
                clock: 33MHz
                capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless
                configuration: broadcast=yes driver=iwlwifi driverversion=4.10.0-19-lowlatency firmware=18.168.6.1 ip=192.168.1.21 latency=0 link=yes multicast=yes wireless=IEEE 802.11
                resources: irq:30 memory:f7b00000-f7b01fff
        *-pci:2
             description: PCI bridge
             product: 7 Series/C216 Chipset Family PCI Express Root Port 4
             vendor: Intel Corporation
             physical id: 1c.3
             bus info: pci@0000:00:1c.3
             version: c4
             width: 32 bits
             clock: 33MHz
             capabilities: pci pciexpress msi pm normal_decode bus_master cap_list
             configuration: driver=pcieport
             resources: irq:19 ioport:e000(size=4096) memory:f7000000-f79fffff ioport:f0000000(size=10485760)
        *-pci:3
             description: PCI bridge
             product: 7 Series/C210 Series Chipset Family PCI Express Root Port 6
             vendor: Intel Corporation
             physical id: 1c.5
             bus info: pci@0000:00:1c.5
             version: c4
             width: 32 bits
             clock: 33MHz
             capabilities: pci pciexpress msi pm normal_decode bus_master cap_list
             configuration: driver=pcieport
             resources: irq:17 memory:f7a00000-f7afffff
           *-generic
                description: SD Host controller
                product: OZ600FJ0/OZ900FJ0/OZ600FJS SD/MMC Card Reader Controller
                vendor: O2 Micro, Inc.
                physical id: 0
                bus info: pci@0000:07:00.0
                version: 05
                width: 32 bits
                clock: 33MHz
                capabilities: pm pciexpress bus_master cap_list
                configuration: driver=sdhci-pci latency=0
                resources: irq:17 memory:f7a02000-f7a021ff
        *-usb:2
             description: USB controller
             product: 7 Series/C216 Chipset Family USB Enhanced Host Controller #1
             vendor: Intel Corporation
             physical id: 1d
             bus info: pci@0000:00:1d.0
             version: 04
             width: 32 bits
             clock: 33MHz
             capabilities: pm debug ehci bus_master cap_list
             configuration: driver=ehci-pci latency=0
             resources: irq:21 memory:f7c37000-f7c373ff
           *-usbhost
                product: EHCI Host Controller
                vendor: Linux 4.10.0-19-lowlatency ehci_hcd
                physical id: 1
                bus info: usb@2
                logical name: usb2
                version: 4.10
                capabilities: usb-2.00
                configuration: driver=hub slots=2 speed=480Mbit/s
              *-usb
                   description: USB hub
                   product: Integrated Rate Matching Hub
                   vendor: Intel Corp.
                   physical id: 1
                   bus info: usb@2:1
                   version: 0.00
                   capabilities: usb-2.00
                   configuration: driver=hub slots=8 speed=480Mbit/s
                 *-usb
                      description: Bluetooth wireless interface
                      vendor: Intel Corp.
                      physical id: 5
                      bus info: usb@2:1.5
                      version: 78.69
                      capabilities: bluetooth usb-2.00
                      configuration: driver=btusb speed=12Mbit/s
        *-isa
             description: ISA bridge
             product: HM77 Express Chipset LPC Controller
             vendor: Intel Corporation
             physical id: 1f
             bus info: pci@0000:00:1f.0
             version: 04
             width: 32 bits
             clock: 33MHz
             capabilities: isa bus_master cap_list
             configuration: driver=lpc_ich latency=0
             resources: irq:0
        *-storage
             description: SATA controller
             product: 7 Series Chipset Family 6-port SATA Controller [AHCI mode]
             vendor: Intel Corporation
             physical id: 1f.2
             bus info: pci@0000:00:1f.2
             version: 04
             width: 32 bits
             clock: 66MHz
             capabilities: storage msi pm ahci_1.0 bus_master cap_list
             configuration: driver=ahci latency=0
             resources: irq:25 ioport:f0d0(size=8) ioport:f0c0(size=4) ioport:f0b0(size=8) ioport:f0a0(size=4) ioport:f060(size=32) memory:f7c36000-f7c367ff
        *-serial UNCLAIMED
             description: SMBus
             product: 7 Series/C216 Chipset Family SMBus Controller
             vendor: Intel Corporation
             physical id: 1f.3
             bus info: pci@0000:00:1f.3
             version: 04
             width: 64 bits
             clock: 33MHz
             configuration: latency=0
             resources: memory:f7c35000-f7c350ff ioport:f040(size=32)
     *-scsi
          physical id: 1
          logical name: scsi0
          capabilities: emulated
        *-disk
             description: ATA Disk
             product: ST500LM000-1EJ16
             vendor: Seagate
             physical id: 0.0.0
             bus info: scsi@0:0.0.0
             logical name: /dev/sda
             version: DEM7
             serial: W372FS25
             size: 465GiB (500GB)
             capabilities: partitioned partitioned:dos
             configuration: ansiversion=5 logicalsectorsize=512 sectorsize=4096 signature=2aa07092
           *-volume
                description: Solaris partition
                physical id: 1
                bus info: scsi@0:0.0.0,1
                logical name: /dev/sda1
                capacity: 465GiB
                capabilities: primary bootable
  *-battery
       product: DELL M0P7P31
       vendor: SMP
       physical id: 1
       version: 03/24/2016
       serial: 0038
       slot: Sys. Battery Bay
       capacity: 64380mWh
       configuration: voltage=11,1V
  *-power UNCLAIMED
       description: To Be Filled By O.E.M.
       product: To Be Filled By O.E.M.
       vendor: To Be Filled By O.E.M.
       physical id: 2
       version: To Be Filled By O.E.M.
       serial: To Be Filled By O.E.M.
       capacity: 65mWh
  *-network:0
       description: Ethernet interface
       physical id: 3
       logical name: virbr0
       serial: 52:54:00:ac:67:b9
       capabilities: ethernet physical
       configuration: broadcast=yes driver=bridge driverversion=2.3 firmware=N/A ip=192.168.122.1 link=no multicast=yes
  *-network:1 DISABLED
       description: Ethernet interface
       physical id: 4
       logical name: virbr0-nic
       serial: 52:54:00:ac:67:b9
       size: 10Mbit/s
       capabilities: ethernet physical
       configuration: autonegotiation=off broadcast=yes driver=tun driverversion=1.6 duplex=full link=no multicast=yes port=twisted pair speed=10Mbit/s