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Bug still present on Ubuntu 16.04 LTS, running on an HP Elitebook 850 G2. Ubuntu is installed on an SSD, and I noticed that there were long delays that the hard drive light wasn't active. A check of dmesg showed two ~6 second delays in the boot process, both on the same problem:
...SNIP...
[ 0.141122] ACPI: bus type PCI registered
[ 0.141123] acpiphp: ACPI Hot Plug PCI Controller Driver version: 0.5
[ 0.141183] PCI: MMCONFIG for domain 0000 [bus 00-ff] at [mem 0xe0000000-
[ 0.141184] PCI: not using MMCONFIG
[ 0.141185] PCI: Using configuration type 1 for base access
[ 0.157183] HugeTLB registered 1 GB page size, pre-allocated 0 pages
[ 0.157184] HugeTLB registered 2 MB page size, pre-allocated 0 pages
[ 0.157406] ACPI: Added _OSI(Module Device)
[ 0.157406] ACPI: Added _OSI(Processor Device)
[ 0.157407] ACPI: Added _OSI(3.0 _SCP Extensions)
[ 0.157408] ACPI: Added _OSI(Processor Aggregator Device)
[ 0.164672] ACPI: [Firmware Bug]: BIOS _OSI(Linux) query ignored
[ 0.169886] ACPI: Dynamic OEM Table Load:
[ 0.169894] ACPI: SSDT 0xFFFFA08A05621000 0003F3 (v02 PmRef Cpu0Cst 00003001 INTL 20130927)
[ 0.170667] ACPI: Dynamic OEM Table Load:
[ 0.170674] ACPI: SSDT 0xFFFFA08A055F8800 0005DB (v02 PmRef ApIst 00003000 INTL 20130927)
[ 0.171490] ACPI: Dynamic OEM Table Load:
[ 0.171495] ACPI: SSDT 0xFFFFA08A0568AA00 000119 (v02 PmRef ApCst 00003000 INTL 20130927)
[ 0.172854] ACPI : EC: EC started
[ 6.094429] ACPI: Interpreter enabled
[ 6.094459] ACPI: (supports S0 S3 S4 S5)
[ 6.094460] ACPI: Using IOAPIC for interrupt routing
[ 6.094480] PCI: MMCONFIG for domain 0000 [bus 00-ff] at [mem 0xe0000000-
[ 6.094904] PCI: MMCONFIG at [mem 0xe0000000-
[ 6.094917] PCI: Using host bridge windows from ACPI; if necessary, use "pci=nocrs" and report a bug
[ 6.096366] ACPI: Power Resource [APPR] (off)
[ 6.098669] ACPI: Power Resource [COMP] (on)
[ 6.098863] ACPI: Power Resource [LPP] (on)
[ 6.099525] ACPI: Power Resource [PXP2] (on)
[ 6.218841] ACPI: Power Resource [WRST] (on)
[ 6.221957] ACPI: PCI Root Bridge [PCI0] (domain 0000 [bus 00-fe])
[ 6.221962] acpi PNP0A08:00: _OSC: OS supports [ExtendedConfig ASPM ClockPM Segments MSI]
[ 6.223644] acpi PNP0A08:00: _OSC: OS now controls [PCIeHotplug PME AER PCIeCapability]
[ 6.223645] acpi PNP0A08:00: FADT indicates ASPM is unsupported, using BIOS configuration
[ 6.224136] PCI host bridge to bus 0000:00
[ 6.224138] pci_bus 0000:00: root bus resource [io 0x0000-0x0cf7 window]
[ 6.224139] pci_bus 0000:00: root bus resource [io 0x0d00-0xffff window]
[ 6.224140] pci_bus 0000:00: root bus resource [mem 0x000a0000-
[ 6.224141] pci_bus 0000:00: root bus resource [mem 0xae800000-
[ 6.224144] pci_bus 0000:00: root bus resource [mem 0xf0000000-
[ 6.224145] pci_bus 0000:00: root bus resource [mem 0xfed45000-
[ 6.224146] pci_bus 0000:00: root bus resource [mem 0xfee01000-
[ 6.224148] pci_bus 0000:00: root bus resource [bus 00-fe]
[ 6.224155] pci 0000:00:00.0: [8086:1604] type 00 class 0x060000
[ 6.224278] pci 0000:00:02.0: [8086:1616] type 00 class 0x030000
[ 6.224288] pci 0000:00:02.0: reg 0x10: [mem 0xc0000000-
[ 6.224294] pci 0000:00:02.0: reg 0x18: [mem 0xb0000000-
[ 6.224298] pci 0000:00:02.0: reg 0x20: [io 0x5000-0x503f]
[ 6.224429] pci 0000:00:03.0: [8086:160c] type 00 class 0x040300
[ 6.224436] pci 0000:00:03.0: reg 0x10: [mem 0xc1330000-
[ 6.224571] pci 0000:00:14.0: [8086:9cb1] type 00 class 0x0c0330
[ 6.224584] pci 0000:00:14.0: reg 0x10: [mem 0xc1320000-
[ 6.224636] pci 0000:00:14.0: PME# supported from D3hot D3cold
[ 6.224702] pci 0000:00:14.0: System wakeup disabled by ACPI
[ 6.224739] pci 0000:00:16.0: [8086:9cba] type 00 class 0x078000
[ 6.224756] pci 0000:00:16.0: reg 0x10: [mem 0xc133b000-
[ 6.224828] pci 0000:00:16.0: PME# supported from D0 D3hot D3cold
[ 6.224931] pci 0000:00:19.0: [8086:15a2] type 00 class 0x020000
[ 6.224944] pci 0000:00:19.0: reg 0x10: [mem 0xc1300000-
[ 6.224951] pci 0000:00:19.0: reg 0x14: [mem 0xc133d000-
[ 6.224958] pci 0000:00:19.0: reg 0x18: [io 0x5080-0x509f]
[ 6.225017] pci 0000:00:19.0: PME# supported from D0 D3hot D3cold
[ 6.225083] pci 0000:00:19.0: System wakeup disabled by ACPI
[ 6.225117] pci 0000:00:1b.0: [8086:9ca0] type 00 class 0x040300
[ 6.225131] pci 0000:00:1b.0: reg 0x10: [mem 0xc1334000-
[ 6.225182] pci 0000:00:1b.0: PME# supported from D0 D3hot D3cold
[ 6.225279] pci 0000:00:1c.0: [8086:9c90] type 01 class 0x060400
[ 6.225345] pci 0000:00:1c.0: PME# supported from D0 D3hot D3cold
[ 6.225470] pci 0000:00:1c.1: [8086:9c92] type 01 class 0x060400
[ 6.225537] pci 0000:00:1c.1: PME# supported from D0 D3hot D3cold
[ 6.225661] pci 0000:00:1c.3: [8086:9c96] type 01 class 0x060400
[ 6.225728] pci 0000:00:1c.3: PME# supported from D0 D3hot D3cold
[ 6.225818] pci 0000:00:1c.3: System wakeup disabled by ACPI
[ 6.225859] pci 0000:00:1d.0: [8086:9ca6] type 00 class 0x0c0320
[ 6.225873] pci 0000:00:1d.0: reg 0x10: [mem 0xc1339000-
[ 6.225948] pci 0000:00:1d.0: PME# supported from D0 D3hot D3cold
[ 6.226015] pci 0000:00:1d.0: System wakeup disabled by ACPI
[ 6.226052] pci 0000:00:1f.0: [8086:9cc3] type 00 class 0x060100
[ 6.226256] pci 0000:00:1f.2: [8086:9c83] type 00 class 0x010601
[ 6.226267] pci 0000:00:1f.2: reg 0x10: [io 0x50a8-0x50af]
[ 6.226273] pci 0000:00:1f.2: reg 0x14: [io 0x50b4-0x50b7]
[ 6.226279] pci 0000:00:1f.2: reg 0x18: [io 0x50a0-0x50a7]
[ 6.226286] pci 0000:00:1f.2: reg 0x1c: [io 0x50b0-0x50b3]
[ 6.226292] pci 0000:00:1f.2: reg 0x20: [io 0x5060-0x507f]
[ 6.226298] pci 0000:00:1f.2: reg 0x24: [mem 0xc1338000-
[ 6.226335] pci 0000:00:1f.2: PME# supported from D3hot
[ 6.226429] pci 0000:00:1f.3: [8086:9ca2] type 00 class 0x0c0500
[ 6.226441] pci 0000:00:1f.3: reg 0x10: [mem 0xc133a000-
[ 6.226458] pci 0000:00:1f.3: reg 0x20: [io 0xef80-0xef9f]
[ 6.226605] pci 0000:00:1c.0: PCI bridge to [bus 01]
[ 6.226609] pci 0000:00:1c.0: bridge window [mem 0xc1200000-
[ 6.226663] pci 0000:02:00.0: [10ec:5227] type 00 class 0xff0000
[ 6.226678] pci 0000:02:00.0: reg 0x10: [mem 0xc1100000-
[ 6.226796] pci 0000:02:00.0: supports D1 D2
[ 6.226797] pci 0000:02:00.0: PME# supported from D1 D2 D3hot D3cold
[ 6.238467] pci 0000:00:1c.1: PCI bridge to [bus 02]
[ 6.238470] pci 0000:00:1c.1: bridge window [io 0x3000-0x4fff]
[ 6.238472] pci 0000:00:1c.1: bridge window [mem 0xc1100000-
[ 6.238686] pci 0000:03:00.0: [8086:095a] type 00 class 0x028000
[ 6.238766] pci 0000:03:00.0: reg 0x10: [mem 0xc1000000-
[ 6.239180] pci 0000:03:00.0: PME# supported from D0 D3hot D3cold
[ 6.239278] pci 0000:03:00.0: System wakeup disabled by ACPI
[ 6.250624] pci 0000:00:1c.3: PCI bridge to [bus 03]
[ 6.250628] pci 0000:00:1c.3: bridge window [mem 0xc1000000-
[ 6.251676] ACPI: PCI Interrupt Link [LNKA] (IRQs 3 4 5 6 10 11 12 14 15) *0, disabled.
[ 6.251718] ACPI: PCI Interrupt Link [LNKB] (IRQs 3 4 5 6 10 11 12 14 15) *0, disabled.
[ 6.251758] ACPI: PCI Interrupt Link [LNKC] (IRQs 3 4 5 6 10 11 12 14 15) *0, disabled.
[ 6.251798] ACPI: PCI Interrupt Link [LNKD] (IRQs 3 4 5 6 10 11 12 14 15) *0, disabled.
[ 6.251837] ACPI: PCI Interrupt Link [LNKE] (IRQs 3 4 5 6 10 11 12 14 15) *0, disabled.
[ 6.251876] ACPI: PCI Interrupt Link [LNKF] (IRQs 3 4 5 6 10 11 12 14 15) *0, disabled.
[ 6.251915] ACPI: PCI Interrupt Link [LNKG] (IRQs 3 4 5 6 10 11 12 14 15) *0, disabled.
[ 6.251954] ACPI: PCI Interrupt Link [LNKH] (IRQs 3 4 5 6 10 11 12 14 15) *0, disabled.
[ 6.252340] ACPI: Enabled 5 GPEs in block 00 to 7F
[ 6.252451] ACPI : EC: EC stopped
[ 6.252489] ACPI : EC: GPE = 0x6, I/O: command/status = 0x66, data = 0x62
[ 6.252489] ACPI : EC: EC started
[ 12.176084] SCSI subsystem initialized
[ 12.176119] libata version 3.00 loaded.
[ 12.176151] vgaarb: setting as boot device: PCI:0000:00:02.0
[ 12.176153] vgaarb: device added: PCI:0000:
[ 12.176155] vgaarb: loaded
...SNIP...
If it weren't for those two 6-second delays, my laptop would boot Ubuntu twice as fast (total boot time listed is 23.8 seconds). Any ideas/solutions?