None HD-Audio Generic HDMI/DP,pcm=3 Other

The None HD-Audio Generic HDMI/DP,pcm=3 is under the Other category and is contained in the certified systems below.

  • Asus K53U Laptop

    • Available from ubuntu.com
    • AMD C-50 Processo
    • Realtek Semiconductor Co., Ltd.
    • ATI Technologies Inc
  • Asus K54H Laptop

    • Available from ubuntu.com
    • Intel
    • Atheros Communications
    • AMD
  • Asus X401U Laptop

    • Pre-installed by manufacturer
    • AMD
    • Realtek Semiconductor Co., Ltd.
    • AMD
  • Asus X501U Laptop

    • Pre-installed by manufacturer
    • AMD
    • Realtek Semiconductor Co., Ltd.
    • AMD
  • Asus X55U Laptop

    • Pre-installed by manufacturer
    • AMD
    • Qualcomm Atheros
    • AMD
  • Dell D50D Desktop

    • Pre-installed by manufacturer
    • AMD
    • Realtek Semiconductor Co., Ltd.
    • ATI Technologies Inc
  • Dell Inspiron 1122 Laptop

    • Available from ubuntu.com
    • AMD processor
    • AMD
    • Qualcomm Atheros
    • AMD
  • Dell Inspiron 20-3455 Desktop

    • Pre-installed by manufacturer
    • AMD
    • Realtek Semiconductor Co., Ltd.
    • AMD
    • AMD
  • Dell Inspiron 24-3455 Desktop

    • Pre-installed by manufacturer
    • AMD
    • Realtek Semiconductor Co., Ltd.
    • AMD
  • Dell Inspiron 3135 Laptop

    • Pre-installed by manufacturer
    • AMD processor
    • Realtek Semiconductor Co., Ltd.
    • AMD
  • Dell Inspiron 3135 Laptop

    • Available from ubuntu.com
    • AMD processor
    • Realtek Semiconductor Co., Ltd.
    • AMD
  • Dell Inspiron 3135 Laptop

    • Pre-installed by manufacturer
    • AMD processor
    • Realtek Semiconductor Co., Ltd.
    • AMD
  • Dell Inspiron 3441 Laptop

    • Pre-installed by manufacturer
    • AMD
    • Realtek Semiconductor Co., Ltd.
    • AMD
  • Dell Inspiron 3441 Laptop

    • Pre-installed by manufacturer
    • AMD
    • Realtek Semiconductor Co., Ltd.
    • AMD
  • Dell Inspiron 3441 Laptop

    • Available from ubuntu.com
    • AMD
    • Realtek Semiconductor Co., Ltd.
    • AMD
  • Dell Inspiron 3541 Laptop

    • Pre-installed by manufacturer
    • AMD
    • Realtek Semiconductor Co., Ltd.
    • AMD
  • Dell Inspiron 3541 Laptop

    • Available from ubuntu.com
    • AMD
    • Realtek Semiconductor Co., Ltd.
    • AMD
  • Dell Inspiron 3541 Laptop

    • Pre-installed by manufacturer
    • AMD
    • Realtek Semiconductor Co., Ltd.
    • AMD
  • Dell Inspiron 5445 Laptop

    • Pre-installed by manufacturer
    • AMD processor
    • Realtek Semiconductor Co., Ltd.
    • AMD
    • AMD
  • Dell Inspiron 5445 Laptop

    • Pre-installed by manufacturer
    • AMD processor
    • Realtek Semiconductor Co., Ltd.
    • AMD
    • AMD
  • Dell Inspiron 5455 Laptop

    • Pre-installed by manufacturer
    • AMD
    • Realtek Semiconductor Co., Ltd.
    • AMD
  • Dell Inspiron 5535 Laptop

    • Pre-installed by manufacturer
    • AMD
    • AMD processor
    • Realtek Semiconductor Co., Ltd.
    • AMD
  • Dell Inspiron 5545 Laptop

    • Pre-installed by manufacturer
    • AMD processor
    • Realtek Semiconductor Co., Ltd.
    • AMD
    • AMD
  • Dell Inspiron 5545 Laptop

    • Pre-installed by manufacturer
    • AMD processor
    • Realtek Semiconductor Co., Ltd.
    • AMD
  • Dell Inspiron 5755 Laptop

    • Pre-installed by manufacturer
    • AMD
    • Realtek Semiconductor Co., Ltd.
    • AMD
  • Dell Inspiron 660s Desktop

    • Available from ubuntu.com
    • Intel
    • Realtek Semiconductor Co., Ltd.
    • ATI Technologies Inc
    • Intel
  • Dell Inspiron M102z Laptop

    • Available from ubuntu.com
    • AMD processor
    • AMD
    • Qualcomm Atheros
    • AMD
  • Dell Inspiron M4040 Laptop

    • Available from ubuntu.com
    • AMD
    • Realtek Semiconductor Co., Ltd.
    • AMD
    • ATI Technologies Inc
  • Dell Inspiron M5040 Laptop

    • Available from ubuntu.com
    • AMD
    • Realtek Semiconductor Co., Ltd.
    • ATI Technologies Inc
  • Dell Inspiron M5110 Laptop

    • Available from ubuntu.com
    • AMD
    • Realtek Semiconductor Co., Ltd.
    • AMD
  • Dell Inspiron M5110 Laptop

    • Available from ubuntu.com
    • AMD
    • Realtek Semiconductor Co., Ltd.
    • ATI Technologies Inc
  • Dell Optiplex 3010 Desktop

    • Pre-installed by manufacturer
    • Intel
    • Realtek Semiconductor Co., Ltd.
    • AMD
    • Intel
  • Dell Optiplex 3010 Desktop

    • Available from ubuntu.com
    • Intel
    • Realtek Semiconductor Co., Ltd.
    • AMD
    • Intel
  • Dell Optiplex 7010 DT Desktop

    • Available from ubuntu.com
    • Intel
    • Intel
    • AMD
  • Dell Optiplex 7010 DT Desktop

    • Available from ubuntu.com
    • Intel
    • Intel
    • AMD
  • Dell Optiplex 9010 Desktop

    • Available from ubuntu.com
    • Intel
    • Broadcom
    • Intel
    • AMD
    • Intel
  • Dell Optiplex 9010 Desktop

    • Pre-installed by manufacturer
    • Intel
    • Broadcom
    • Intel
    • AMD
    • Intel
  • Dell Optiplex XE2 Unknown

    • Pre-installed by manufacturer
    • Intel
    • Intel
    • AMD
  • Dell Optiplex XE2 Unknown

    • Available from ubuntu.com
    • Intel
    • Intel
    • AMD
  • Dell Optiplex XE2 Unknown

    • Available from ubuntu.com
    • Intel
    • Intel
    • AMD
  • Dell Precision M6800 Laptop

    • Pre-installed by manufacturer
    • Intel
    • Intel
    • AMD
  • Dell Vostro 3555 Laptop

    • Available from ubuntu.com
    • AMD
    • Realtek Semiconductor Co., Ltd.
    • AMD
  • Dell Vostro 470 Desktop

    • Available from ubuntu.com
    • Intel
    • Realtek Semiconductor Co., Ltd.
    • ATI Technologies Inc
  • Dell Z50D Desktop

    • Pre-installed by manufacturer
    • AMD
    • Realtek Semiconductor Co., Ltd.
    • AMD
  • HP 110 Desktop PC Desktop

    • Pre-installed by manufacturer
    • AMD
    • Realtek Semiconductor Co., Ltd.
    • AMD
  • HP 110 Desktop PC Desktop

    • Pre-installed by manufacturer
    • AMD
    • Realtek Semiconductor Co., Ltd.
    • AMD
  • HP 14 Notebook PC Laptop

    • Pre-installed by manufacturer
    • AMD processor
    • Realtek Semiconductor Co., Ltd.
    • AMD
    • AMD
  • HP 14 Notebook PC Laptop

    • Pre-installed by manufacturer
    • AMD processor
    • Realtek Semiconductor Co., Ltd.
    • AMD
  • HP 14 TouchSmart Notebook PC Laptop

    • Available from ubuntu.com
    • AMD processor
    • Realtek Semiconductor Co., Ltd.
    • AMD
  • HP 14 TouchSmart Notebook PC Laptop

    • Pre-installed by manufacturer
    • AMD processor
    • Realtek Semiconductor Co., Ltd.
    • AMD
  • HP 15 Notebook PC Laptop

    • Pre-installed by manufacturer
    • AMD processor
    • Realtek Semiconductor Co., Ltd.
    • AMD
    • AMD
  • HP 15 Notebook PC Laptop

    • Pre-installed by manufacturer
    • AMD processor
    • Realtek Semiconductor Co., Ltd.
    • AMD
    • AMD
  • HP 15 TouchSmart Notebook PC Laptop

    • Pre-installed by manufacturer
    • AMD processor
    • Realtek Semiconductor Co., Ltd.
    • AMD
  • HP 15 TouchSmart Notebook PC Laptop

    • Available from ubuntu.com
    • AMD processor
    • Realtek Semiconductor Co., Ltd.
    • AMD
  • HP 15 TouchSmart Notebook PC Laptop

    • Pre-installed by manufacturer
    • AMD processor
    • Realtek Semiconductor Co., Ltd.
    • AMD
  • HP 18 All-in-One PC Desktop

    • Pre-installed by manufacturer
    • AMD
    • Realtek Semiconductor Co., Ltd.
    • AMD
  • HP 18 All-in-One PC Desktop

    • Pre-installed by manufacturer
    • AMD
    • Realtek Semiconductor Co., Ltd.
    • AMD
  • HP 19 AIO Desktop

    • Pre-installed by manufacturer
    • AMD
    • Realtek Semiconductor Co., Ltd.
    • AMD
  • HP 19 AIO Desktop

    • Pre-installed by manufacturer
    • AMD
    • Realtek Semiconductor Co., Ltd.
    • AMD
  • HP 19 All-in-One PC Desktop

    • Pre-installed by manufacturer
    • AMD
    • Realtek Semiconductor Co., Ltd.
    • AMD
    • AMD
  • HP 20 All-in-One PC Desktop

    • Pre-installed by manufacturer
    • AMD
    • Realtek Semiconductor Co., Ltd.
    • AMD
  • HP 20 All-in-One PC Desktop

    • Pre-installed by manufacturer
    • AMD
    • Realtek Semiconductor Co., Ltd.
    • AMD
    • AMD
  • HP 245 G2 Laptop

    • Pre-installed by manufacturer
    • AMD processor
    • Realtek Semiconductor Co., Ltd.
    • AMD
  • HP 245 G2 Laptop

    • Available from ubuntu.com
    • AMD processor
    • Realtek Semiconductor Co., Ltd.
    • AMD
  • HP 255 G1 Notebook PC Laptop

    • Pre-installed by manufacturer
    • AMD processor
    • Realtek Semiconductor Co., Ltd.
    • AMD
  • HP 255 G2 Laptop

    • Pre-installed by manufacturer
    • AMD processor
    • Realtek Semiconductor Co., Ltd.
    • AMD
  • HP 255 G2 Laptop

    • Available from ubuntu.com
    • AMD processor
    • Realtek Semiconductor Co., Ltd.
    • AMD
  • HP 255 G3 Laptop

    • Pre-installed by manufacturer
    • AMD processor
    • Realtek Semiconductor Co., Ltd.
    • AMD
  • HP 255 G3 Laptop

    • Pre-installed by manufacturer
    • AMD processor
    • Realtek Semiconductor Co., Ltd.
    • AMD
    • AMD
  • HP 255 G3 Laptop

    • Pre-installed by manufacturer
    • AMD processor
    • Realtek Semiconductor Co., Ltd.
    • AMD
    • AMD
  • HP 345 G2 Notebook PC Laptop

    • Pre-installed by manufacturer
    • AMD processor
    • Realtek Semiconductor Co., Ltd.
    • AMD
    • AMD
  • HP 345 G2 Notebook PC Laptop

    • Pre-installed by manufacturer
    • AMD processor
    • Realtek Semiconductor Co., Ltd.
    • AMD
    • AMD
  • HP 355 G2 Notebook PC Laptop

    • Pre-installed by manufacturer
    • AMD processor
    • Realtek Semiconductor Co., Ltd.
    • AMD
  • HP 355 G2 Notebook PC Laptop

    • Pre-installed by manufacturer
    • AMD processor
    • Realtek Semiconductor Co., Ltd.
    • AMD
    • AMD
  • HP 655 Laptop

    • Available from ubuntu.com
    • AMD processor
    • Realtek Semiconductor Co., Ltd.
    • AMD
  • HP 655 Laptop

    • Available from ubuntu.com
    • AMD processor
    • Realtek Semiconductor Co., Ltd.
    • AMD
  • HP 655 Laptop

    • Pre-installed by manufacturer
    • AMD processor
    • Realtek Semiconductor Co., Ltd.
    • AMD
  • HP Compaq 100 Desktop PC Desktop

    • Pre-installed by manufacturer
    • AMD
    • Realtek Semiconductor Co., Ltd.
    • AMD
  • HP Compaq 100 Desktop PC Desktop

    • Pre-installed by manufacturer
    • AMD
    • Realtek Semiconductor Co., Ltd.
    • AMD
  • HP Compaq 14 Notebook PC Laptop

    • Pre-installed by manufacturer
    • AMD processor
    • Realtek Semiconductor Co., Ltd.
    • AMD
  • HP Compaq 14 Notebook PC Laptop

    • Pre-installed by manufacturer
    • AMD processor
    • Realtek Semiconductor Co., Ltd.
    • AMD
    • AMD
  • HP Compaq 14 TouchSmart Notebook PC Laptop

    • Available from ubuntu.com
    • AMD processor
    • Realtek Semiconductor Co., Ltd.
    • AMD
  • HP Compaq 14 TouchSmart Notebook PC Laptop

    • Pre-installed by manufacturer
    • AMD processor
    • Realtek Semiconductor Co., Ltd.
    • AMD
  • HP Compaq 15 Notebook PC Laptop

    • Pre-installed by manufacturer
    • AMD processor
    • Realtek Semiconductor Co., Ltd.
    • AMD
    • AMD
  • HP Compaq 15 Notebook PC Laptop

    • Pre-installed by manufacturer
    • AMD processor
    • Realtek Semiconductor Co., Ltd.
    • AMD
    • AMD
  • HP Compaq 15 TouchSmart Notebook PC Laptop

    • Available from ubuntu.com
    • AMD processor
    • Realtek Semiconductor Co., Ltd.
    • AMD
  • HP Compaq 15 TouchSmart Notebook PC Laptop

    • Pre-installed by manufacturer
    • AMD processor
    • Realtek Semiconductor Co., Ltd.
    • AMD
  • HP Compaq 15 TouchSmart Notebook PC Laptop

    • Pre-installed by manufacturer
    • AMD processor
    • Realtek Semiconductor Co., Ltd.
    • AMD
  • HP Compaq 18 All-in-One PC Desktop

    • Pre-installed by manufacturer
    • AMD
    • Realtek Semiconductor Co., Ltd.
    • AMD
  • HP EliteBook 725 G2 Notebook PC Laptop

    • Pre-installed by manufacturer
    • AMD
    • Realtek Semiconductor Co., Ltd.
    • AMD
  • HP EliteBook 745 G2 Notebook PC Laptop

    • Pre-installed by manufacturer
    • AMD
    • Realtek Semiconductor Co., Ltd.
    • AMD
  • HP EliteDesk 705 G1 DM Business PC Desktop

    • Pre-installed by manufacturer
    • AMD
    • Broadcom
    • AMD
  • HP EliteDesk 705 G1 DM Business PC Desktop

    • Pre-installed by manufacturer
    • AMD
    • Broadcom
    • AMD
  • HP EliteDesk 705 G1 MT Business PC Desktop

    • Pre-installed by manufacturer
    • AMD
    • Broadcom
    • Intel
    • AMD
  • HP EliteDesk 705 G1 MT Business PC Desktop

    • Pre-installed by manufacturer
    • AMD
    • Broadcom
    • Intel
    • AMD
  • HP EliteDesk 705 G1 SFF Business PC Desktop

    • Pre-installed by manufacturer
    • AMD
    • Broadcom
    • Intel
    • AMD
  • HP EliteDesk 705 G1 SFF Business PC Desktop

    • Pre-installed by manufacturer
    • AMD
    • Broadcom
    • Intel
    • AMD
  • HP EliteOne 705 G1 23-inch Non-Touch AiO PC Desktop

    • Pre-installed by manufacturer
    • AMD
    • Broadcom
    • AMD
  • HP EliteOne 705 G1 23-inch Non-Touch AiO PC Desktop

    • Pre-installed by manufacturer
    • AMD
    • Broadcom
    • AMD
  • HP Pavilion 14 Notebook PC Laptop

    • Pre-installed by manufacturer
    • AMD
    • Realtek Semiconductor Co., Ltd.
    • AMD
  • HP Pavilion 14 Notebook PC Laptop

    • Pre-installed by manufacturer
    • AMD
    • Realtek Semiconductor Co., Ltd.
    • AMD
    • AMD
  • HP Pavilion 14 Notebook PC Laptop

    • Pre-installed by manufacturer
    • AMD
    • Realtek Semiconductor Co., Ltd.
    • AMD
    • AMD
  • HP Pavilion 14 Notebook PC Laptop

    • Pre-installed by manufacturer
    • AMD processor
    • Realtek Semiconductor Co., Ltd.
    • AMD
    • AMD
  • HP Pavilion 15 Notebook PC Laptop

    • Available from ubuntu.com
    • AMD processor
    • Realtek Semiconductor Co., Ltd.
    • AMD
  • HP Pavilion 15 Notebook PC Laptop

    • Pre-installed by manufacturer
    • AMD processor
    • Realtek Semiconductor Co., Ltd.
    • AMD
  • HP Pavilion 15 Notebook PC Laptop

    • Available from ubuntu.com
    • AMD processor
    • Realtek Semiconductor Co., Ltd.
    • AMD
  • HP Pavilion 15 TouchSmart Notebook PC Laptop

    • Pre-installed by manufacturer
    • AMD
    • Realtek Semiconductor Co., Ltd.
    • AMD
    • AMD
  • HP Pavilion Sleekbook 14 Laptop

    • Available from ubuntu.com
    • AMD processor
    • AMD
    • Realtek Semiconductor Co., Ltd.
    • AMD
  • HP Pavilion Sleekbook 14 Laptop

    • Available from ubuntu.com
    • AMD processor
    • AMD
    • Realtek Semiconductor Co., Ltd.
    • AMD
  • HP Pavilion Sleekbook 14 Laptop

    • Pre-installed by manufacturer
    • AMD processor
    • AMD
    • Realtek Semiconductor Co., Ltd.
    • ATI Technologies Inc
  • HP Pavilion Sleekbook 14 Laptop

    • Pre-installed by manufacturer
    • AMD processor
    • AMD
    • Realtek Semiconductor Co., Ltd.
    • AMD
  • HP Pavilion dm1 Laptop

    • Pre-installed by manufacturer
    • AMD processor
    • Realtek Semiconductor Co., Ltd.
    • AMD
  • HP Pavilion g4 Laptop

    • Pre-installed by manufacturer
    • AMD processor
    • Realtek Semiconductor Co., Ltd.
    • AMD
  • HP Pavilion g4 Laptop

    • Pre-installed by manufacturer
    • AMD processor
    • Realtek Semiconductor Co., Ltd.
    • AMD
  • HP Pavilion g4 Laptop

    • Available from ubuntu.com
    • AMD processor
    • Realtek Semiconductor Co., Ltd.
    • AMD
  • HP Pavilion g4 Laptop

    • Available from ubuntu.com
    • AMD processor
    • Realtek Semiconductor Co., Ltd.
    • AMD
  • HP Pro 3500 Series MT PC Desktop

    • Pre-installed by manufacturer
    • Intel
    • Intel
    • Realtek Semiconductor Co., Ltd.
    • AMD
    • nVidia
    • Intel
  • HP Pro 3500 Series MT PC Desktop

    • Pre-installed by manufacturer
    • Intel
    • Intel
    • Realtek Semiconductor Co., Ltd.
    • AMD
    • nVidia
    • Intel
  • HP ProBook 445 G2 Notebook PC Laptop

    • Pre-installed by manufacturer
    • AMD
    • Realtek Semiconductor Co., Ltd.
    • AMD
  • HP ProBook 445 G2 Notebook PC Laptop

    • Pre-installed by manufacturer
    • AMD
    • Realtek Semiconductor Co., Ltd.
    • AMD
    • AMD
  • HP ProBook 455 G2 Notebook PC Laptop

    • Pre-installed by manufacturer
    • AMD
    • Realtek Semiconductor Co., Ltd.
    • AMD
    • AMD
  • HP ProDesk 405 G2 MT Business PC Desktop

    • Pre-installed by manufacturer
    • AMD
    • Realtek Semiconductor Co., Ltd.
    • AMD
  • HP ProDesk 405 G2 MT Business PC Desktop

    • Pre-installed by manufacturer
    • AMD
    • Realtek Semiconductor Co., Ltd.
    • AMD
  • HP ProDesk 485 G2 MT Business PC Desktop

    • Pre-installed by manufacturer
    • AMD
    • Realtek Semiconductor Co., Ltd.
    • AMD
  • HP ProDesk 485 G2 MT Business PC Desktop

    • Pre-installed by manufacturer
    • AMD
    • Realtek Semiconductor Co., Ltd.
    • AMD
  • HP Z400 Workstation Desktop

    • Available from ubuntu.com
    • Intel
    • Broadcom
    • AMD
  • HP Z620 Workstation Desktop

    • Available from ubuntu.com
    • Intel
    • Intel
    • AMD
  • Lenovo B4450s Laptop

    • Pre-installed by manufacturer
    • AMD
    • Realtek Semiconductor Co., Ltd.
    • AMD
  • Lenovo E455 Laptop

    • Pre-installed by manufacturer
    • AMD
    • Realtek Semiconductor Co., Ltd.
    • AMD
    • AMD
  • Lenovo H505s Desktop

    • Pre-installed by manufacturer
    • AMD
    • Realtek Semiconductor Co., Ltd.
    • AMD
  • Lenovo H505s Desktop

    • Pre-installed by manufacturer
    • AMD
    • Realtek Semiconductor Co., Ltd.
    • AMD
  • Lenovo H515s Desktop

    • Pre-installed by manufacturer
    • AMD
    • Realtek Semiconductor Co., Ltd.
    • AMD
  • Lenovo H515s Desktop

    • Pre-installed by manufacturer
    • AMD
    • Realtek Semiconductor Co., Ltd.
    • AMD
  • Lenovo S30 Desktop

    • Pre-installed by manufacturer
    • Intel
    • Intel
    • AMD
  • Lenovo S30 Desktop

    • Pre-installed by manufacturer
    • Intel
    • Intel
    • AMD
  • Lenovo ThinkCentre Edge 72 Desktop

    • Available from ubuntu.com
    • Intel
    • Realtek Semiconductor Co., Ltd.
    • AMD
  • Lenovo ThinkCentre Edge 91z Desktop

    • Available from ubuntu.com
    • Intel
    • Intel
    • ATI Technologies Inc
  • Lenovo ThinkCentre Edge 92z Desktop

    • Available from ubuntu.com
    • Intel
    • Intel
    • ATI Technologies Inc
  • Lenovo ThinkCentre M72e Desktop

    • Available from ubuntu.com
    • Intel
    • Realtek Semiconductor Co., Ltd.
    • AMD
  • Lenovo ThinkCentre M72e Desktop

    • Available from ubuntu.com
    • Intel
    • Realtek Semiconductor Co., Ltd.
    • AMD
  • Lenovo ThinkPad Edge E145 Laptop

    • Pre-installed by manufacturer
    • AMD
    • Realtek Semiconductor Co., Ltd.
    • AMD
  • Lenovo ThinkPad Edge E145 Laptop

    • Pre-installed by manufacturer
    • AMD
    • Realtek Semiconductor Co., Ltd.
    • AMD
  • Lenovo ThinkPad Edge E555 Laptop

    • Pre-installed by manufacturer
    • AMD
    • Realtek Semiconductor Co., Ltd.
    • AMD
    • AMD
  • Lenovo ThinkPad X140e Laptop

    • Pre-installed by manufacturer
    • AMD
    • Realtek Semiconductor Co., Ltd.
    • AMD
  • Lenovo Thinkpad Edge 14 Laptop

    • Available from ubuntu.com
    • AMD
    • Realtek Semiconductor Co., Ltd.
    • AMD
  • Lenovo Thinkpad Edge E125 Laptop

    • Available from ubuntu.com
    • AMD
    • Atheros Communications
    • ATI Technologies Inc
  • Lenovo Thinkpad Edge E325 Laptop

    • Available from ubuntu.com
    • AMD
    • Atheros Communications
    • ATI Technologies Inc
  • Lenovo X121e Laptop

    • Available from ubuntu.com
    • AMD
    • Atheros Communications
    • ATI Technologies Inc