The model is already in patch_realtek.c's quirk table:
SND_HDA_PIN_QUIRK(0x10ec0256, 0x1028, "Dell",
ALC255_FIXUP_DELL1_MIC_NO_PRESENCE,
{0x12, 0x90a60160},
{0x14, 0x90170120},
{0x21, 0x02211030}),
Please file an upstream bug at https://bugzilla.kernel.org
Product: Drivers
Component: Sound(ALSA)
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https://bugs.launchpad.net/bugs/1724752
Title:
No headphones sound after a boot up
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