you may need patch similar to

http://git.kernel.org/cgit/linux/kernel/git/tiwai/sound.git/commit/sound/pci/hda?id=ac612407932be18697b5ae9da0a80f138b8bea8e
static struct snd_pci_quirk alc269_fixup_tbl[] = {
        SND_PCI_QUIRK_VENDOR(0x104d, "Sony VAIO", ALC269_FIXUP_SONY_VAIO),
        SND_PCI_QUIRK(0x1028, 0x0470, "Dell M101z", ALC269_FIXUP_DELL_M101Z),
+       SND_PCI_QUIRK(0x1043, 0x1a13, "Dell Vostro 5460", 
ALC269_FIXUP_ASUS_G73JW),
        SND_PCI_QUIRK(0x17aa, 0x21b8, "Thinkpad Edge 14", 
ALC269_FIXUP_LENOVO_EDGE14),
        SND_PCI_QUIRK(0x1043, 0x1a13, "Asus G73Jw", ALC269_FIXUP_ASUS_G73JW),
        {}
 };
 

or you define a new fixup ALC290_FIXUP_DELL_VOSTRO_5460 instead of using
ALC269_FIXUP_ASUS_G73JW

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https://bugs.launchpad.net/bugs/1211920

Title:
  Low audio output on Vostro 5460 (with Ubuntu pre-loaded)

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