CDブートで12.04を立ち上げ、USB-HDDを差し込むと、ちゃんと認識されました。
ということで、14.04カーネル側に問題があると判定出来ました。
しかし、どうしようか…困ったなー、バックアップディスクなんで、大切なデータが格納されているんだけど。
といって、母機を12.04に戻すのも、大変だし。

一応，当方のUSB接続HDDの状況を報告しておきます。
Ubuntu14.04 LST AMD64 をクリーンインストールした環境です。
USB接続のHDD IO−DATA HDCR 1TB ですが、なにもしないで挿しただけで全く問題なく使えています。
以上です。

当PC環境は、木製の台のむき出しのテスト用のマシンです。
　CPU=intel core i5 750 4core 2.67Ghz
　M/B GIGABYTE GA-P55M-UD2
　メモリ　８GB
　グラフィック　RADEON HD5450

dmesgの結果をコピーしてみます。

santa1404test@santa1404test-P55M-UD2:~⟫ dmesg
[    0.000000] Initializing cgroup subsys cpuset
[    0.000000] Initializing cgroup subsys cpu
[    0.000000] Initializing cgroup subsys cpuacct
[    0.000000] Linux version 3.13.0-24-generic (buildd@panlong) (gcc version 4.8.2 (Ubuntu 4.8.2-19ubuntu1) ) #46-Ubuntu SMP Thu Apr 10 19:11:08 UTC 2014 (Ubuntu 3.13.0-24.46-generic 3.13.9)
[    0.000000] Command line: BOOT_IMAGE=/boot/vmlinuz-3.13.0-24-generic root=UUID=d836f0dd-f464-41c7-92d9-99a98584a668 ro quiet splash vt.handoff=7
[    0.000000] KERNEL supported cpus:
[    0.000000]   Intel GenuineIntel
[    0.000000]   AMD AuthenticAMD
[    0.000000]   Centaur CentaurHauls
[    0.000000] e820: BIOS-provided physical RAM map:
[    0.000000] BIOS-e820: [mem 0x0000000000000000-0x000000000009dbff] usable
[    0.000000] BIOS-e820: [mem 0x000000000009f800-0x000000000009ffff] reserved
[    0.000000] BIOS-e820: [mem 0x00000000000f0000-0x00000000000fffff] reserved
[    0.000000] BIOS-e820: [mem 0x0000000000100000-0x00000000df7dffff] usable
[    0.000000] BIOS-e820: [mem 0x00000000df7e0000-0x00000000df7e1fff] ACPI NVS
[    0.000000] BIOS-e820: [mem 0x00000000df7e2000-0x00000000df7effff] ACPI data
[    0.000000] BIOS-e820: [mem 0x00000000df7f0000-0x00000000df7fffff] reserved
[    0.000000] BIOS-e820: [mem 0x00000000f4000000-0x00000000f7ffffff] reserved
[    0.000000] BIOS-e820: [mem 0x00000000fec00000-0x00000000ffffffff] reserved
[    0.000000] BIOS-e820: [mem 0x0000000100000000-0x000000021fffffff] usable
[    0.000000] NX (Execute Disable) protection: active
[    0.000000] SMBIOS 2.4 present.
[    0.000000] DMI: Gigabyte Technology Co., Ltd. P55M-UD2/P55M-UD2, BIOS F11 06/23/2010
[    0.000000] e820: update [mem 0x00000000-0x00000fff] usable ==> reserved
[    0.000000] e820: remove [mem 0x000a0000-0x000fffff] usable
[    0.000000] No AGP bridge found
[    0.000000] e820: last_pfn = 0x220000 max_arch_pfn = 0x400000000
[    0.000000] MTRR default type: uncachable
[    0.000000] MTRR fixed ranges enabled:
[    0.000000]   00000-9FFFF write-back
[    0.000000]   A0000-BFFFF uncachable
[    0.000000]   C0000-CDFFF write-protect
[    0.000000]   CE000-EFFFF uncachable
[    0.000000]   F0000-FFFFF write-through
[    0.000000] MTRR variable ranges enabled:
[    0.000000]   0 base 000000000 mask F00000000 write-back
[    0.000000]   1 base 0E0000000 mask FE0000000 uncachable
[    0.000000]   2 base 100000000 mask F00000000 write-back
[    0.000000]   3 base 200000000 mask FE0000000 write-back
[    0.000000]   4 disabled
[    0.000000]   5 disabled
[    0.000000]   6 disabled
[    0.000000]   7 disabled
[    0.000000] x86 PAT enabled: cpu 0, old 0x7040600070406, new 0x7010600070106
[    0.000000] original variable MTRRs
[    0.000000] reg 0, base: 0GB, range: 4GB, type WB
[    0.000000] reg 1, base: 3584MB, range: 512MB, type UC
[    0.000000] reg 2, base: 4GB, range: 4GB, type WB
[    0.000000] reg 3, base: 8GB, range: 512MB, type WB
[    0.000000] total RAM covered: 8192M
[    0.000000] Found optimal setting for mtrr clean up
[    0.000000]  gran_size: 64K  chunk_size: 64K         num_reg: 5      lose cover RAM: 0G
[    0.000000] New variable MTRRs
[    0.000000] reg 0, base: 0GB, range: 2GB, type WB
[    0.000000] reg 1, base: 2GB, range: 1GB, type WB
[    0.000000] reg 2, base: 3GB, range: 512MB, type WB
[    0.000000] reg 3, base: 4GB, range: 4GB, type WB
[    0.000000] reg 4, base: 8GB, range: 512MB, type WB
[    0.000000] e820: update [mem 0xe0000000-0xffffffff] usable ==> reserved
[    0.000000] e820: last_pfn = 0xdf7e0 max_arch_pfn = 0x400000000
[    0.000000] found SMP MP-table at [mem 0x000f55f0-0x000f55ff] mapped at [ffff8800000f55f0]
[    0.000000] Scanning 1 areas for low memory corruption
[    0.000000] Base memory trampoline at [ffff880000097000] 97000 size 24576
[    0.000000] init_memory_mapping: [mem 0x00000000-0x000fffff]
[    0.000000]  [mem 0x00000000-0x000fffff] page 4k
[    0.000000] BRK [0x01fdd000, 0x01fddfff] PGTABLE
[    0.000000] BRK [0x01fde000, 0x01fdefff] PGTABLE
[    0.000000] BRK [0x01fdf000, 0x01fdffff] PGTABLE
[    0.000000] init_memory_mapping: [mem 0x21fe00000-0x21fffffff]
[    0.000000]  [mem 0x21fe00000-0x21fffffff] page 2M
[    0.000000] BRK [0x01fe0000, 0x01fe0fff] PGTABLE
[    0.000000] init_memory_mapping: [mem 0x21c000000-0x21fdfffff]
[    0.000000]  [mem 0x21c000000-0x21fdfffff] page 2M
[    0.000000] init_memory_mapping: [mem 0x200000000-0x21bffffff]
[    0.000000]  [mem 0x200000000-0x21bffffff] page 2M
[    0.000000] init_memory_mapping: [mem 0x00100000-0xdf7dffff]
[    0.000000]  [mem 0x00100000-0x001fffff] page 4k
[    0.000000]  [mem 0x00200000-0xdf5fffff] page 2M
[    0.000000]  [mem 0xdf600000-0xdf7dffff] page 4k
[    0.000000] init_memory_mapping: [mem 0x100000000-0x1ffffffff]
[    0.000000]  [mem 0x100000000-0x1ffffffff] page 2M
[    0.000000] BRK [0x01fe1000, 0x01fe1fff] PGTABLE
[    0.000000] BRK [0x01fe2000, 0x01fe2fff] PGTABLE
[    0.000000] RAMDISK: [mem 0x35b54000-0x36da1fff]
[    0.000000] ACPI: RSDP 00000000000f6fb0 000014 (v00 GBT   )
[    0.000000] ACPI: RSDT 00000000df7e2040 000040 (v01 GBT    GBTUACPI 42302E31 GBTU 01010101)
[    0.000000] ACPI: FACP 00000000df7e20c0 000074 (v01 GBT    GBTUACPI 42302E31 GBTU 01010101)
[    0.000000] ACPI: DSDT 00000000df7e2180 004D56 (v01 GBT    GBTUACPI 00001000 MSFT 0100000C)
[    0.000000] ACPI: FACS 00000000df7e0000 000040
[    0.000000] ACPI: HPET 00000000df7e7040 000038 (v01 GBT    GBTUACPI 42302E31 GBTU 00000098)
[    0.000000] ACPI: MCFG 00000000df7e70c0 00003C (v01 GBT    GBTUACPI 42302E31 GBTU 01010101)
[    0.000000] ACPI: EUDS 00000000df7e7100 000560 (v01 GBT             00000000      00000000)
[    0.000000] ACPI: TAMG 00000000df7e7660 0009C2 (v01 GBT    GBT   B0 5455312E BG?? 53450101)
[    0.000000] ACPI: APIC 00000000df7e6f40 0000BC (v01 GBT    GBTUACPI 42302E31 GBTU 01010101)
[    0.000000] ACPI: SSDT 00000000df7e8040 00130C (v01  INTEL PPM RCM  80000001 INTL 20061109)
[    0.000000] ACPI: Local APIC address 0xfee00000
[    0.000000] No NUMA configuration found
[    0.000000] Faking a node at [mem 0x0000000000000000-0x000000021fffffff]
[    0.000000] Initmem setup node 0 [mem 0x00000000-0x21fffffff]
[    0.000000]   NODE_DATA [mem 0x21fff5000-0x21fff9fff]
[    0.000000]  [ffffea0000000000-ffffea00087fffff] PMD -> [ffff880217600000-ffff88021f5fffff] on node 0
[    0.000000] Zone ranges:
[    0.242909] pci 0000:00:1f.2: reg 0x20: [io  0xf400-0xf41f]
[    0.242917] pci 0000:00:1f.2: reg 0x24: [mem 0xfbffd000-0xfbffd7ff]
[    0.242964] pci 0000:00:1f.2: PME# supported from D3hot
[    0.243042] pci 0000:00:1f.3: [8086:3b30] type 00 class 0x0c0500
[    0.243058] pci 0000:00:1f.3: reg 0x10: [mem 0xfbffc000-0xfbffc0ff 64bit]
[    0.243079] pci 0000:00:1f.3: reg 0x20: [io  0x0500-0x051f]
[    0.243213] pci 0000:01:00.0: [1002:68f9] type 00 class 0x030000
[    0.243227] pci 0000:01:00.0: reg 0x10: [mem 0xe0000000-0xefffffff 64bit pref]
[    0.243238] pci 0000:01:00.0: reg 0x18: [mem 0xfbdc0000-0xfbddffff 64bit]
[    0.243246] pci 0000:01:00.0: reg 0x20: [io  0xce00-0xceff]
[    0.243259] pci 0000:01:00.0: reg 0x30: [mem 0x00000000-0x0001ffff pref]
[    0.243291] pci 0000:01:00.0: supports D1 D2
[    0.243331] pci 0000:01:00.1: [1002:aa68] type 00 class 0x040300
[    0.243345] pci 0000:01:00.1: reg 0x10: [mem 0xfbdfc000-0xfbdfffff 64bit]
[    0.243404] pci 0000:01:00.1: supports D1 D2
[    0.249052] pci 0000:00:03.0: PCI bridge to [bus 01]
[    0.249056] pci 0000:00:03.0:   bridge window [io  0xc000-0xcfff]
[    0.249060] pci 0000:00:03.0:   bridge window [mem 0xfbd00000-0xfbdfffff]
[    0.249064] pci 0000:00:03.0:   bridge window [mem 0xe0000000-0xefffffff 64bit pref]
[    0.249115] pci 0000:00:1c.0: PCI bridge to [bus 02]
[    0.249211] pci 0000:03:00.0: [197b:2363] type 00 class 0x010601
[    0.249300] pci 0000:03:00.0: reg 0x24: [mem 0xfbbfe000-0xfbbfffff]
[    0.249365] pci 0000:03:00.0: PME# supported from D3hot
[    0.249425] pci 0000:03:00.1: [197b:2363] type 00 class 0x010185
[    0.249450] pci 0000:03:00.1: reg 0x10: [io  0xef00-0xef07]
[    0.249464] pci 0000:03:00.1: reg 0x14: [io  0xee00-0xee03]
[    0.249478] pci 0000:03:00.1: reg 0x18: [io  0xed00-0xed07]
[    0.249492] pci 0000:03:00.1: reg 0x1c: [io  0xec00-0xec03]
[    0.249505] pci 0000:03:00.1: reg 0x20: [io  0xeb00-0xeb0f]
[    0.249614] pci 0000:03:00.0: disabling ASPM on pre-1.1 PCIe device.  You can enable it with 'pcie_aspm=force'
[    0.249624] pci 0000:00:1c.4: PCI bridge to [bus 03]
[    0.249628] pci 0000:00:1c.4:   bridge window [io  0xe000-0xefff]
[    0.249632] pci 0000:00:1c.4:   bridge window [mem 0xfbb00000-0xfbbfffff]
[    0.249704] pci 0000:04:00.0: [10ec:8168] type 00 class 0x020000
[    0.249721] pci 0000:04:00.0: reg 0x10: [io  0xde00-0xdeff]
[    0.249750] pci 0000:04:00.0: reg 0x18: [mem 0xfbeff000-0xfbefffff 64bit pref]
[    0.249768] pci 0000:04:00.0: reg 0x20: [mem 0xfbef8000-0xfbefbfff 64bit pref]
[    0.249780] pci 0000:04:00.0: reg 0x30: [mem 0x00000000-0x0001ffff pref]
[    0.249847] pci 0000:04:00.0: supports D1 D2
[    0.249849] pci 0000:04:00.0: PME# supported from D0 D1 D2 D3hot D3cold
[    0.257049] pci 0000:00:1c.5: PCI bridge to [bus 04]
[    0.257053] pci 0000:00:1c.5:   bridge window [io  0xd000-0xdfff]
[    0.257057] pci 0000:00:1c.5:   bridge window [mem 0xfba00000-0xfbafffff]
[    0.257063] pci 0000:00:1c.5:   bridge window [mem 0xfbe00000-0xfbefffff 64bit pref]
[    0.257112] pci 0000:05:07.0: [104c:8024] type 00 class 0x0c0010
[    0.257131] pci 0000:05:07.0: reg 0x10: [mem 0xfbcff000-0xfbcff7ff]
[    0.257141] pci 0000:05:07.0: reg 0x14: [mem 0xfbcf8000-0xfbcfbfff]
[    0.257211] pci 0000:05:07.0: supports D1 D2
[    0.257213] pci 0000:05:07.0: PME# supported from D0 D1 D2 D3hot
[    0.257274] pci 0000:00:1e.0: PCI bridge to [bus 05] (subtractive decode)
[    0.257280] pci 0000:00:1e.0:   bridge window [mem 0xfbc00000-0xfbcfffff]
[    0.257286] pci 0000:00:1e.0:   bridge window [io  0x0000-0x0cf7] (subtractive decode)
[    0.257288] pci 0000:00:1e.0:   bridge window [io  0x0d00-0xffff] (subtractive decode)
[    0.257290] pci 0000:00:1e.0:   bridge window [mem 0x000a0000-0x000bffff] (subtractive decode)
[    0.257292] pci 0000:00:1e.0:   bridge window [mem 0x000c0000-0x000dffff] (subtractive decode)
[    0.257294] pci 0000:00:1e.0:   bridge window [mem 0xdf800000-0xfebfffff] (subtractive decode)
[    0.257761] ACPI: PCI Interrupt Link [LNKA] (IRQs 3 4 5 6 7 9 *10 11 12 14 15)
[    0.257822] ACPI: PCI Interrupt Link [LNKB] (IRQs 3 4 5 6 7 9 10 *11 12 14 15)
[    0.257881] ACPI: PCI Interrupt Link [LNKC] (IRQs *3 4 5 6 7 9 10 11 12 14 15)
[    0.257940] ACPI: PCI Interrupt Link [LNKD] (IRQs 3 4 5 6 7 9 10 11 *12 14 15)
[    0.257998] ACPI: PCI Interrupt Link [LNKE] (IRQs 3 4 5 6 7 9 10 11 12 14 15) *0, disabled.
[    0.258057] ACPI: PCI Interrupt Link [LNKF] (IRQs 3 4 5 6 7 *9 10 11 12 14 15)
[    0.258115] ACPI: PCI Interrupt Link [LNK0] (IRQs 3 4 *5 6 7 9 10 11 12 14 15)
[    0.258174] ACPI: PCI Interrupt Link [LNK1] (IRQs 3 4 5 6 *7 9 10 11 12 14 15)
[    0.258272] ACPI: \_SB_.PCI0: notify handler is installed
[    0.258311] Found 1 acpi root devices
[    0.258398] vgaarb: device added: PCI:0000:01:00.0,decodes=io+mem,owns=io+mem,locks=none
[    0.258400] vgaarb: loaded
[    0.258401] vgaarb: bridge control possible 0000:01:00.0
[    0.258564] SCSI subsystem initialized
[    0.258599] libata version 3.00 loaded.
[    0.258619] ACPI: bus type USB registered
[    0.258633] usbcore: registered new interface driver usbfs
[    0.258640] usbcore: registered new interface driver hub
[    0.258662] usbcore: registered new device driver usb
[    0.258756] PCI: Using ACPI for IRQ routing
[    0.260192] PCI: Discovered peer bus 3f
[    0.260193] PCI: root bus 3f: using default resources
[    0.260195] PCI: Probing PCI hardware (bus 3f)
[    0.260217] PCI host bridge to bus 0000:3f
[    0.260220] pci_bus 0000:3f: root bus resource [io  0x0000-0xffff]
[    0.260222] pci_bus 0000:3f: root bus resource [mem 0x00000000-0xfffffffff]
[    0.260224] pci_bus 0000:3f: No busn resource found for root bus, will use [bus 3f-ff]
[    0.260227] pci_bus 0000:3f: busn_res: can not insert [bus 3f-ff] under domain [bus 00-ff] (conflicts with (null) [bus 00-3f])
[    0.260233] pci 0000:3f:00.0: [8086:2c51] type 00 class 0x060000
[    0.260274] pci 0000:3f:00.1: [8086:2c81] type 00 class 0x060000
[    0.260315] pci 0000:3f:02.0: [8086:2c90] type 00 class 0x060000
[    0.260352] pci 0000:3f:02.1: [8086:2c91] type 00 class 0x060000
[    0.260392] pci 0000:3f:03.0: [8086:2c98] type 00 class 0x060000
[    0.260430] pci 0000:3f:03.1: [8086:2c99] type 00 class 0x060000
[    0.260468] pci 0000:3f:03.4: [8086:2c9c] type 00 class 0x060000
[    0.260507] pci 0000:3f:04.0: [8086:2ca0] type 00 class 0x060000
[    0.260542] pci 0000:3f:04.1: [8086:2ca1] type 00 class 0x060000
[    0.260583] pci 0000:3f:04.2: [8086:2ca2] type 00 class 0x060000
[    0.260623] pci 0000:3f:04.3: [8086:2ca3] type 00 class 0x060000
[    0.260662] pci 0000:3f:05.0: [8086:2ca8] type 00 class 0x060000
[    0.260698] pci 0000:3f:05.1: [8086:2ca9] type 00 class 0x060000
[    0.260736] pci 0000:3f:05.2: [8086:2caa] type 00 class 0x060000
[    0.260773] pci 0000:3f:05.3: [8086:2cab] type 00 class 0x060000
[    0.260823] pci_bus 0000:3f: busn_res: [bus 3f-ff] end is updated to 3f
[    0.260827] PCI: pci_cache_line_size set to 64 bytes
[    0.260911] e820: reserve RAM buffer [mem 0x0009dc00-0x0009ffff]
[    0.260913] e820: reserve RAM buffer [mem 0xdf7e0000-0xdfffffff]
[    0.260988] NetLabel: Initializing
[    0.260990] NetLabel:  domain hash size = 128
[    0.260991] NetLabel:  protocols = UNLABELED CIPSOv4
[    0.261006] NetLabel:  unlabeled traffic allowed by default
[    0.261089] HPET: 8 timers in total, 5 timers will be used for per-cpu timer
[    0.261096] hpet0: at MMIO 0xfed00000, IRQs 2, 8, 40, 41, 42, 43, 44, 0
[    0.261102] hpet0: 8 comparators, 64-bit 14.318180 MHz counter
[    0.263139] hpet: hpet2 irq 40 for MSI
[    0.263186] hpet: hpet3 irq 41 for MSI
[    0.263244] hpet: hpet4 irq 42 for MSI
[    0.263291] hpet: hpet5 irq 43 for MSI
[    0.263334] Switched to clocksource hpet
[    0.268323] AppArmor: AppArmor Filesystem Enabled
[    0.268343] pnp: PnP ACPI init
[    0.268354] ACPI: bus type PNP registered
[    0.268506] system 00:00: [io  0x04d0-0x04d1] has been reserved
[    0.268509] system 00:00: [io  0x0290-0x029f] has been reserved
[    0.268511] system 00:00: [io  0x0800-0x087f] has been reserved
[    0.268513] system 00:00: [io  0x0290-0x0294] has been reserved
[    0.268515] system 00:00: [io  0x0880-0x088f] has been reserved
0:1b.0/sound/card0/input8
[   19.942501] input: HDA Intel MID Line as /devices/pci0000:00/0000:00:1b.0/sound/card0/input7
[   19.942567] input: HDA Intel MID Front Mic as /devices/pci0000:00/0000:00:1b.0/sound/card0/input6
[   19.942620] input: HDA Intel MID Rear Mic as /devices/pci0000:00/0000:00:1b.0/sound/card0/input5
[   19.955027] [drm] GART: num cpu pages 262144, num gpu pages 262144
[   19.957447] [drm] enabling PCIE gen 2 link speeds, disable with radeon.pcie_gen2=0
[   19.970787] [drm] PCIE GART of 1024M enabled (table at 0x000000000025D000).
[   19.971017] radeon 0000:01:00.0: WB enabled
[   19.971022] radeon 0000:01:00.0: fence driver on ring 0 use gpu addr 0x0000000040000c00 and cpu addr 0xffff8800c158ac00
[   19.971025] radeon 0000:01:00.0: fence driver on ring 3 use gpu addr 0x0000000040000c0c and cpu addr 0xffff8800c158ac0c
[   19.971720] radeon 0000:01:00.0: fence driver on ring 5 use gpu addr 0x000000000005c418 and cpu addr 0xffffc9000589c418
[   19.971863] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
[   19.971866] [drm] Driver supports precise vblank timestamp query.
[   19.971886] radeon 0000:01:00.0: irq 48 for MSI/MSI-X
[   19.971898] radeon 0000:01:00.0: radeon: using MSI.
[   19.971924] [drm] radeon: irq initialized.
[   19.990209] [drm] ring test on 0 succeeded in 1 usecs
[   19.990269] [drm] ring test on 3 succeeded in 1 usecs
[   20.031583] gpio_ich: GPIO from 180 to 255 on gpio_ich
[   20.097534] EXT4-fs (sdb1): re-mounted. Opts: errors=remount-ro
[   20.175783] [drm] ring test on 5 succeeded in 1 usecs
[   20.175789] [drm] UVD initialized successfully.
[   20.176030] [drm] Enabling audio 0 support
[   20.176061] [drm] ib test on ring 0 succeeded in 0 usecs
[   20.176088] [drm] ib test on ring 3 succeeded in 0 usecs
[   20.326237] [drm] ib test on ring 5 succeeded
[   20.326551] [drm] Radeon Display Connectors
[   20.326553] [drm] Connector 0:
[   20.326554] [drm]   HDMI-A-1
[   20.326555] [drm]   HPD1
[   20.326557] [drm]   DDC: 0x6460 0x6460 0x6464 0x6464 0x6468 0x6468 0x646c 0x646c
[   20.326558] [drm]   Encoders:
[   20.326559] [drm]     DFP1: INTERNAL_UNIPHY1
[   20.326561] [drm] Connector 1:
[   20.326562] [drm]   DVI-I-1
[   20.326563] [drm]   HPD4
[   20.326565] [drm]   DDC: 0x6440 0x6440 0x6444 0x6444 0x6448 0x6448 0x644c 0x644c
[   20.326566] [drm]   Encoders:
[   20.326567] [drm]     DFP2: INTERNAL_UNIPHY
[   20.326568] [drm]     CRT1: INTERNAL_KLDSCP_DAC1
[   20.326569] [drm] Connector 2:
[   20.326571] [drm]   VGA-1
[   20.326572] [drm]   DDC: 0x6430 0x6430 0x6434 0x6434 0x6438 0x6438 0x643c 0x643c
[   20.326573] [drm]   Encoders:
[   20.326574] [drm]     CRT2: INTERNAL_KLDSCP_DAC2
[   20.326615] [drm] Internal thermal controller without fan control
[   20.337806] [drm] radeon: dpm initialized
[   20.388219] [drm] fb mappable at 0xE045E000
[   20.388222] [drm] vram apper at 0xE0000000
[   20.388223] [drm] size 5947392
[   20.388225] [drm] fb depth is 24
[   20.388226] [drm]    pitch is 5632
[   20.388383] fbcon: radeondrmfb (fb0) is primary device
[   20.396943] init: failsafe main process (611) killed by TERM signal
[   20.415728] Console: switching to colour frame buffer device 175x65
[   20.419927] radeon 0000:01:00.0: fb0: radeondrmfb frame buffer device
[   20.419929] radeon 0000:01:00.0: registered panic notifier
[   20.419991] [drm] Initialized radeon 2.36.0 20080528 for 0000:01:00.0 on minor 0
[   20.420162] hda-intel 0000:01:00.1: Handle VGA-switcheroo audio client
[   20.420165] hda-intel 0000:01:00.1: Using LPIB position fix
[   20.420204] snd_hda_intel 0000:01:00.1: irq 49 for MSI/MSI-X
[   20.429426] hda-intel 0000:01:00.1: Enable sync_write for stable communication
[   20.434993] HDMI ATI/AMD: no speaker allocation for ELD
[   20.435060] input: HDA ATI HDMI HDMI/DP,pcm=3 as /devices/pci0000:00/0000:00:03.0/0000:01:00.1/sound/card1/input13
[   20.513772] Bluetooth: Core ver 2.17
[   20.513848] NET: Registered protocol family 31
[   20.513850] Bluetooth: HCI device and connection manager initialized
[   20.513858] Bluetooth: HCI socket layer initialized
[   20.513861] Bluetooth: L2CAP socket layer initialized
[   20.513866] Bluetooth: SCO socket layer initialized
[   20.517464] Bluetooth: BNEP (Ethernet Emulation) ver 1.3
[   20.517467] Bluetooth: BNEP filters: protocol multicast
[   20.517473] Bluetooth: BNEP socket layer initialized
[   20.531629] Bluetooth: RFCOMM TTY layer initialized
[   20.531638] Bluetooth: RFCOMM socket layer initialized
[   20.531643] Bluetooth: RFCOMM ver 1.11
[   20.675688] init: avahi-cups-reload main process (797) terminated with status 1
[   20.679851] type=1400 audit(1399117172.043:9): apparmor="STATUS" operation="profile_load" profile="unconfined" name="/usr/lib/cups/backend/cups-pdf" pid=801 comm="apparmor_parser"
[   20.679858] type=1400 audit(1399117172.043:10): apparmor="STATUS" operation="profile_load" profile="unconfined" name="/usr/sbin/cupsd" pid=801 comm="apparmor_parser"
[   20.680376] type=1400 audit(1399117172.043:11): apparmor="STATUS" operation="profile_replace" profile="unconfined" name="/usr/sbin/cupsd" pid=801 comm="apparmor_parser"
[   20.703026] usb 1-1: r8712u: CustomerID = 0x0000
[   20.703033] usb 1-1: r8712u: MAC Address from efuse = 00:22:cf:44:5a:1f
[   20.703038] usb 1-1: r8712u: Loading firmware from "rtlwifi/rtl8712u.bin"
[   20.703066] r8712u: Staging version
[   20.703084] r8712u: register rtl8712_netdev_ops to netdev_ops
[   20.703089] usb 1-3: r8712u: USB_SPEED_HIGH with 4 endpoints
[   20.703633] usb 1-3: r8712u: Boot from EFUSE: Autoload OK
[   21.083492] cfg80211: Calling CRDA to update world regulatory domain
[   21.618116] usb 1-3: r8712u: CustomerID = 0x0000
[   21.618121] usb 1-3: r8712u: MAC Address from efuse = 00:22:cf:45:f2:ad
[   21.618123] usb 1-3: r8712u: Loading firmware from "rtlwifi/rtl8712u.bin"
[   21.618159] usbcore: registered new interface driver r8712u
[   21.796820] r8712u 1-1:1.0 wlan0: 1 RCR=0x153f00e
[   21.797666] r8712u 1-1:1.0 wlan0: 2 RCR=0x553f00e
[   21.908527] IPv6: ADDRCONF(NETDEV_UP): wlan0: link is not ready
[   21.908651] cfg80211: World regulatory domain updated:
[   21.908654] cfg80211:   (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp)
[   21.908656] cfg80211:   (2402000 KHz - 2472000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)
[   21.908658] cfg80211:   (2457000 KHz - 2482000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)
[   21.908660] cfg80211:   (2474000 KHz - 2494000 KHz @ 20000 KHz), (300 mBi, 2000 mBm)
[   21.908662] cfg80211:   (5170000 KHz - 5250000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)
[   21.908664] cfg80211:   (5735000 KHz - 5835000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)
[   21.908853] IPv6: ADDRCONF(NETDEV_UP): wlan0: link is not ready
[   22.216135] IPv6: ADDRCONF(NETDEV_UP): wlan0: link is not ready
[   22.293110] r8169 0000:04:00.0 eth0: link down
[   22.293131] r8169 0000:04:00.0 eth0: link down
[   22.293140] IPv6: ADDRCONF(NETDEV_UP): eth0: link is not ready
[   22.293550] IPv6: ADDRCONF(NETDEV_UP): eth0: link is not ready
[   22.630229] init: plymouth-upstart-bridge main process ended, respawning
[   22.635580] init: plymouth-upstart-bridge main process (1323) terminated with status 1
[   22.635594] init: plymouth-upstart-bridge main process ended, respawning
[   24.660777] r8169 0000:04:00.0 eth0: link up
[   24.660785] IPv6: ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready
[   25.296097] init: plymouth-stop pre-start process (2235) terminated with status 1
[   42.771489] IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready
[   42.771703] r8712u 1-1:1.0 wlan0: r8712_got_addbareq_event_callback: mac = 00:26:87:08:a2:2e, seq = 0, tid = 0
[   43.287274] r8712u 1-1:1.0 wlan0: r8712_got_addbareq_event_callback: mac = 00:26:87:08:a2:2e, seq = 0, tid = 0

以上です。ご参考になれば幸いです。