Confirmed here too. This issue has not been resolved in ubuntu 14.04 64bit. Bought a brandnew toshiba S50-A /S50t-A with no sound after succesfull installation with a dualboot installation with windows 8 in UEFI mode. Sound indicators work, but silence from speakers and headphone jacks...

~$ aplay -l
**** Lijst van PLAYBACK hardware-apparaten ****
kaart 0: HDMI [HDA ATI HDMI], apparaat 3: HDMI 0 [HDMI 0]
  Sub-apparaten: 1/1
  Sub-apparaat #0: subdevice #0
kaart 1: Generic [HD-Audio Generic], apparaat 0: 92HD99BXX Analog [92HD99BXX Analog]
  Sub-apparaten: 1/1
  Sub-apparaat #0: subdevice #0

Under no circumstances sound when installed with UEFI-(dual) boot enabled. I tried building newest DKMS drivers for intel HD, changing  asound.conf preferred card to 1 but no sound whatsoever (because i thought HDMI output was set to default at first) .Toggling all settings in ALSAMIXER, pavucontrol did not work either. (The only thing that did respond was the built in microphone that responded on input). 

The only solution that provided sound  was to set the bios into CSM-mode (RonW (warden-ronald)  on 2013-10-02 tx!). So i ended up deleting all windows 8 crap. But still after hibernation mode a reboot only could force back sound.  Killing, restarting pulsaudio or alsa had no effect also.

~$lshw
   description: Notebook
    product: SATELLITE S50D-A-10L (PSKKWE)
    vendor: TOSHIBA
    version: PSKKWE-00T00EDU
    serial: 4E077728S
    width: 64 bits
    capabilities: smbios-2.7 dmi-2.7 ldt16 vsyscall32
    configuration: boot=normal chassis=notebook family=Type1Family sku=PSKKWE uuid=903F796F-A2C4-E381-3D7C-2025648FE7E5
  *-core
       description: Moederbord
       product: VG10AD
       vendor: AMD
       physical id: 0
       version: Base Board Version
       serial: Base Board Serial Number
       slot: Base Board Chassis Location
     *-firmware
          description: BIOS
          vendor: Insyde Corp.
          physical id: 0
          version: 1.40
          date: 01/28/2014
          size: 128KiB
          capacity: 4032KiB
          capabilities: pci upgrade shadowing cdboot bootselect socketedrom edd int13floppynec int13floppytoshiba int13floppy360 int13floppy1200 int13floppy720 int13floppy2880 int9keyboard int10video acpi usb uefi
     *-cpu
          description: CPU
          product: AMD A10-5745M APU with Radeon(tm) HD Graphics
          vendor: Advanced Micro Devices [AMD]
          physical id: 4
          bus info: cpu@0
          version: AMD A10-5745M APU with Radeon(tm) HD Graphics
          serial: NotSupport
          slot: Socket FT1
          size: 1100MHz
          capacity: 2100MHz
          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 mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt pdpe1gb rdtscp constant_tsc rep_good nopl nonstop_tsc extd_apicid aperfmperf pni pclmulqdq monitor ssse3 fma cx16 sse4_1 sse4_2 popcnt aes xsave avx f16c lahf_lm cmp_legacy svm extapic cr8_legacy abm sse4a misalignsse 3dnowprefetch osvw ibs xop skinit wdt lwp fma4 tce nodeid_msr tbm topoext perfctr_core perfctr_nb arat cpb hw_pstate npt lbrv svm_lock nrip_save tsc_scale vmcb_clean flushbyasid decodeassists pausefilter pfthreshold bmi1 cpufreq
          configuration: cores=4 enabledcores=4 threads=4
        *-cache:0
             description: L1 cache
             physical id: 8
             slot: L1 Cache
             size: 192KiB
             capacity: 192KiB
             clock: 1GHz (1.0ns)
             capabilities: pipeline-burst internal write-back unified
        *-cache:1
             description: L2 cache
             physical id: 9
             slot: L2 Cache
             size: 4MiB
             capacity: 4MiB
             clock: 1GHz (1.0ns)
             capabilities: pipeline-burst internal write-back unified
     *-memory
          description: System Memory
          physical id: 22
          slot: Systeem- of moederbord
          size: 8GiB
        *-bank:0
             description: SODIMM DDR3 Synchroon 800 MHz (1,2 ns)
             product: M471B1G73QH0-YK0
             vendor: Samsung
             physical id: 0
             serial: 152ADDCB
             slot: DIMM 0
             size: 8GiB
             width: 64 bits
             clock: 800MHz (1.2ns)
        *-bank:1
             description: Project-Id-Version: lshwReport-Msgid-Bugs-To: FULL NAME <EMAIL@ADDRESS>POT-Creation-Date: 2009-10-08 14:02+0200PO-Revision-Date: 2013-01-22 19:06+0000Last-Translator: FULL NAME <EMAIL@ADDRESS>Language-Team: Dutch <email address hidden>MIME-Version: 1.0Content-Type: text/plain; charset=UTF-8Content-Transfer-Encoding: 8bitX-Launchpad-Export-Date: 2014-11-10 11:11+0000X-Generator: Launchpad (build 17241)Project-Id-Version: lshwReport-Msgid-Bugs-To: FULL NAME <EMAIL@ADDRESS>POT-Creation-Date: 2009-10-08 14:02+0200PO-Revision-Date: 2013-01-22 19:06+0000Last-Translator: FULL NAME <EMAIL@ADDRESS>Language-Team: Dutch <email address hidden>MIME-Version: 1.0Content-Type: text/plain; charset=UTF-8Content-Transfer-Encoding: 8bitX-Launchpad-Export-Date: 2014-11-10 11:11+0000X-Generator: Launchpad (build 17241) [empty]
             product: Empty
             vendor: Empty
             physical id: 1
             serial: Empty
             slot: DIMM 0
     *-pci:0
          description: Host bridge
          product: Family 15h (Models 10h-1fh) Processor Root Complex
          vendor: Advanced Micro Devices, Inc. [AMD]
          physical id: 100
          bus info: pci@0000:00:00.0
          version: 00
          width: 32 bits
          clock: 66MHz
          configuration: latency=32
        *-display
             description: VGA compatible controller
             product: Richland [Radeon HD 8610G]
             vendor: Advanced Micro Devices, Inc. [AMD/ATI]
             physical id: 1
             bus info: pci@0000:00:01.0
             version: 00
             width: 32 bits
             clock: 33MHz
             capabilities: pm pciexpress msi vga_controller bus_master cap_list rom
             configuration: driver=fglrx_pci latency=0
             resources: irq:48 memory:d0000000-dfffffff ioport:4000(size=256) memory:f0300000-f033ffff
        *-multimedia:0
             description: Audio device
             product: Trinity HDMI Audio Controller
             vendor: Advanced Micro Devices, Inc. [AMD/ATI]
             physical id: 1.1
             bus info: pci@0000:00:01.1
             version: 00
             width: 32 bits
             clock: 33MHz
             capabilities: pm pciexpress msi bus_master cap_list
             configuration: driver=snd_hda_intel latency=0
             resources: irq:46 memory:f0344000-f0347fff
        *-pci:0
             description: PCI bridge
             product: Family 15h (Models 10h-1fh) Processor Root Port
             vendor: Advanced Micro Devices, Inc. [AMD]
             physical id: 2
             bus info: pci@0000:00:02.0
             version: 00
             width: 32 bits
             clock: 33MHz
             capabilities: pci pm pciexpress msi ht normal_decode bus_master cap_list
             configuration: driver=pcieport
             resources: irq:18 ioport:3000(size=4096) memory:f0200000-f02fffff ioport:e0000000(size=268435456)
           *-display
                description: Display controller
                product: Sun PRO [Radeon HD 8570A/8570M]
                vendor: Advanced Micro Devices, Inc. [AMD/ATI]
                physical id: 0
                bus info: pci@0000:01:00.0
                version: 00
                width: 64 bits
                clock: 33MHz
                capabilities: pm pciexpress msi bus_master cap_list rom
                configuration: driver=fglrx_pci latency=0
                resources: irq:49 memory:e0000000-efffffff memory:f0200000-f023ffff ioport:3000(size=256) memory:f0240000-f025ffff
        *-pci:1
             description: PCI bridge
             product: Family 15h (Models 10h-1fh) Processor Root Port
             vendor: Advanced Micro Devices, Inc. [AMD]
             physical id: 4
             bus info: pci@0000:00:04.0
             version: 00
             width: 32 bits
             clock: 33MHz
             capabilities: pci pm pciexpress msi ht normal_decode bus_master cap_list
             configuration: driver=pcieport
             resources: irq:16 memory:f0100000-f01fffff ioport:f0400000(size=1048576)
           *-network
                description: Wireless interface
                product: QCA9565 / AR9565 Wireless Network Adapter
                vendor: Qualcomm Atheros
                physical id: 0
                bus info: pci@0000:02:00.0
                logical name: wlan0
                version: 01
                serial: b8:ee:65:51:1d:ac
                width: 64 bits
                clock: 33MHz
                capabilities: pm msi pciexpress bus_master cap_list rom ethernet physical wireless
                configuration: broadcast=yes driver=ath9k driverversion=3.13.0-32-generic firmware=N/A ip=192.168.2.112 latency=0 link=yes multicast=yes wireless=IEEE 802.11bgn
                resources: irq:16 memory:f0100000-f017ffff memory:f0400000-f040ffff
        *-pci:2
             description: PCI bridge
             product: Family 15h (Models 10h-1fh) Processor Root Port
             vendor: Advanced Micro Devices, Inc. [AMD]
             physical id: 7
             bus info: pci@0000:00:07.0
             version: 00
             width: 32 bits
             clock: 33MHz
             capabilities: pci pm pciexpress msi ht normal_decode bus_master cap_list
             configuration: driver=pcieport
             resources: irq:19 ioport:2000(size=4096) memory:f1000000-f1ffffff ioport:f0000000(size=1048576)
           *-network
                description: Ethernet interface
                product: QCA8172 Fast Ethernet
                vendor: Qualcomm Atheros
                physical id: 0
                bus info: pci@0000:03:00.0
                logical name: eth0
                version: 10
                serial: 20:25:64:8f:e7:e5
                capacity: 100Mbit/s
                width: 64 bits
                clock: 33MHz
                capabilities: pm pciexpress msi msix bus_master cap_list ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd autonegotiation
                configuration: autonegotiation=on broadcast=yes driver=alx latency=0 link=no multicast=yes port=twisted pair
                resources: irq:47 memory:f1000000-f103ffff ioport:2000(size=128)
        *-usb:0
             description: USB controller
             product: FCH USB XHCI Controller
             vendor: Advanced Micro Devices, Inc. [AMD]
             physical id: 10
             bus info: pci@0000:00:10.0
             version: 09
             width: 64 bits
             clock: 33MHz
             capabilities: pm msi msix pciexpress xhci bus_master cap_list
             configuration: driver=xhci_hcd latency=0
             resources: irq:18 memory:f0348000-f0349fff
        *-storage
             description: SATA controller
             product: FCH SATA Controller [AHCI mode]
             vendor: Advanced Micro Devices, Inc. [AMD]
             physical id: 11
             bus info: pci@0000:00:11.0
             version: 00
             width: 32 bits
             clock: 66MHz
             capabilities: storage msi ahci_1.0 bus_master cap_list
             configuration: driver=ahci latency=64
             resources: irq:45 ioport:4118(size=8) ioport:4124(size=4) ioport:4110(size=8) ioport:4120(size=4) ioport:4100(size=16) memory:f034f000-f034f7ff
        *-usb:1
             description: USB controller
             product: FCH USB OHCI Controller
             vendor: Advanced Micro Devices, Inc. [AMD]
             physical id: 12
             bus info: pci@0000:00:12.0
             version: 11
             width: 32 bits
             clock: 66MHz
             capabilities: ohci bus_master
             configuration: driver=ohci-pci latency=32
             resources: irq:18 memory:f034e000-f034efff
        *-usb:2
             description: USB controller
             product: FCH USB EHCI Controller
             vendor: Advanced Micro Devices, Inc. [AMD]
             physical id: 12.2
             bus info: pci@0000:00:12.2
             version: 11
             width: 32 bits
             clock: 66MHz
             capabilities: pm debug ehci bus_master cap_list
             configuration: driver=ehci-pci latency=32
             resources: irq:17 memory:f034d000-f034d0ff
        *-usb:3
             description: USB controller
             product: FCH USB OHCI Controller
             vendor: Advanced Micro Devices, Inc. [AMD]
             physical id: 13
             bus info: pci@0000:00:13.0
             version: 11
             width: 32 bits
             clock: 66MHz
             capabilities: ohci bus_master
             configuration: driver=ohci-pci latency=32
             resources: irq:18 memory:f034c000-f034cfff
        *-usb:4
             description: USB controller
             product: FCH USB EHCI Controller
             vendor: Advanced Micro Devices, Inc. [AMD]
             physical id: 13.2
             bus info: pci@0000:00:13.2
             version: 11
             width: 32 bits
             clock: 66MHz
             capabilities: pm debug ehci bus_master cap_list
             configuration: driver=ehci-pci latency=32
             resources: irq:17 memory:f034b000-f034b0ff
        *-serial UNCLAIMED
             description: SMBus
             product: FCH SMBus Controller
             vendor: Advanced Micro Devices, Inc. [AMD]
             physical id: 14
             bus info: pci@0000:00:14.0
             version: 16
             width: 32 bits
             clock: 66MHz
             configuration: latency=0
        *-multimedia:1
             description: Audio device
             product: FCH Azalia Controller
             vendor: Advanced Micro Devices, Inc. [AMD]
             physical id: 14.2
             bus info: pci@0000:00:14.2
             version: 01
             width: 64 bits
             clock: 33MHz
             capabilities: pm bus_master cap_list
             configuration: driver=snd_hda_intel latency=32
             resources: irq:16 memory:f0340000-f0343fff
        *-isa
             description: ISA bridge
             product: FCH LPC Bridge
             vendor: Advanced Micro Devices, Inc. [AMD]
             physical id: 14.3
             bus info: pci@0000:00:14.3
             version: 11
             width: 32 bits
             clock: 66MHz
             capabilities: isa bus_master
             configuration: latency=0
        *-pci:3
             description: PCI bridge
             product: FCH PCI Bridge
             vendor: Advanced Micro Devices, Inc. [AMD]
             physical id: 14.4
             bus info: pci@0000:00:14.4
             version: 40
             width: 32 bits
             clock: 66MHz
             capabilities: pci subtractive_decode
        *-usb:5
             description: USB controller
             product: FCH USB OHCI Controller
             vendor: Advanced Micro Devices, Inc. [AMD]
             physical id: 14.5
             bus info: pci@0000:00:14.5
             version: 11
             width: 32 bits
             clock: 66MHz
             capabilities: ohci bus_master
             configuration: driver=ohci-pci latency=32
             resources: irq:18 memory:f034a000-f034afff
     *-pci:1
          description: Host bridge
          product: Family 15h (Models 10h-1fh) Processor Function 0
          vendor: Advanced Micro Devices, Inc. [AMD]
          physical id: 101
          bus info: pci@0000:00:18.0
          version: 00
          width: 32 bits
          clock: 33MHz
     *-pci:2
          description: Host bridge
          product: Family 15h (Models 10h-1fh) Processor Function 1
          vendor: Advanced Micro Devices, Inc. [AMD]
          physical id: 102
          bus info: pci@0000:00:18.1
          version: 00
          width: 32 bits
          clock: 33MHz
     *-pci:3
          description: Host bridge
          product: Family 15h (Models 10h-1fh) Processor Function 2
          vendor: Advanced Micro Devices, Inc. [AMD]
          physical id: 103
          bus info: pci@0000:00:18.2
          version: 00
          width: 32 bits
          clock: 33MHz
     *-pci:4
          description: Host bridge
          product: Family 15h (Models 10h-1fh) Processor Function 3
          vendor: Advanced Micro Devices, Inc. [AMD]
          physical id: 104
          bus info: pci@0000:00:18.3
          version: 00
          width: 32 bits
          clock: 33MHz
          configuration: driver=k10temp
          resources: irq:0
     *-pci:5
          description: Host bridge
          product: Family 15h (Models 10h-1fh) Processor Function 4
          vendor: Advanced Micro Devices, Inc. [AMD]
          physical id: 105
          bus info: pci@0000:00:18.4
          version: 00
          width: 32 bits
          clock: 33MHz
     *-pci:6
          description: Host bridge
          product: Family 15h (Models 10h-1fh) Processor Function 5
          vendor: Advanced Micro Devices, Inc. [AMD]
          physical id: 106
          bus info: pci@0000:00:18.5
          version: 00
          width: 32 bits
          clock: 33MHz
     *-scsi:0
          physical id: 1
          logical name: scsi0
          capabilities: emulated
        *-disk
             description: ATA Disk
             product: TOSHIBA MQ01ABD1
             vendor: Toshiba
             physical id: 0.0.0
             bus info: scsi@0:0.0.0
             logical name: /dev/sda
             version: AX0A
             serial: 345CPFR9T
             size: 931GiB (1TB)
             capabilities: partitioned partitioned:dos
             configuration: ansiversion=5 sectorsize=512 signature=0009f336
           *-volume:0
                description: EXT4 volume
                vendor: Linux
                physical id: 1
                bus info: scsi@0:0.0.0,1
                logical name: /dev/sda1
                logical name: /
                version: 1.0
                serial: aeb0806b-86e4-4a6b-bd84-150759b634cf
                size: 924GiB
                capacity: 924GiB
                capabilities: primary bootable journaled extended_attributes large_files huge_files dir_nlink extents ext4 ext2 initialized
                configuration: created=2014-12-30 21:52:40 filesystem=ext4 lastmountpoint=/ modified=2014-12-30 22:58:50 mount.fstype=ext4 mount.options=rw,relatime,errors=remount-ro,data=ordered mounted=2014-12-30 22:58:50 state=mounted
           *-volume:1
                description: Extended partition
                physical id: 2
                bus info: scsi@0:0.0.0,2
                logical name: /dev/sda2
                size: 7373MiB
                capacity: 7373MiB
                capabilities: primary extended partitioned partitioned:extended
              *-logicalvolume
                   description: Linux swap / Solaris partition
                   physical id: 5
                   logical name: /dev/sda5
                   capacity: 7373MiB
                   capabilities: nofs
     *-scsi:1
          physical id: 2
          bus info: usb@2:3
          logical name: scsi1
          capabilities: emulated scsi-host
          configuration: driver=usb-storage
        *-disk
             description: SCSI Disk
             product: Card  Reader
             vendor: Multiple
             physical id: 0.0.0
             bus info: scsi@1:0.0.0
             logical name: /dev/sdb
             version: 1.00
             serial: AU6485
             capabilities: removable
             configuration: ansiversion=4 sectorsize=512
           *-medium
                physical id: 0
                logical name: /dev/sdb