This hack works for me:
--- a/drivers/platform/x86/intel-vbtn.c
+++ b/drivers/platform/x86/intel-vbtn.c
@@ -35,8 +35,18 @@ static const struct acpi_device_id intel_vbtn_ids[] = {
 
 /* In theory, these are HID usages. */
 static const struct key_entry intel_vbtn_keymap[] = {
-       { KE_IGNORE, 0xC0, { KEY_POWER } },     /* power key press */
-       { KE_KEY, 0xC1, { KEY_POWER } },        /* power key release */
+    { KE_IGNORE, 0xC0, { KEY_POWER } },             /* power key press */
+    { KE_KEY, 0xC1, { KEY_POWER } },                /* power key release */
+    { KE_IGNORE, 0xC2, { KEY_F13 } },               /* SUPER key press */
+    { KE_KEY, 0xC3, { KEY_F14 } },                  /* SUPER key release */
+    { KE_IGNORE, 0xC4, { KEY_VOLUMEUP } },          /* vol up key press */
+    { KE_KEY, 0xC5, { KEY_VOLUMEUP } },             /* vol up key release */
+    { KE_IGNORE, 0xC6, { KEY_VOLUMEDOWN } },        /* vol down key press */
+    { KE_KEY, 0xC7, { KEY_VOLUMEDOWN } },           /* vol down key release */
+    { KE_IGNORE, 0xC8, { KEY_ROTATE_DISPLAY } },    /* rotate key press */
+    { KE_KEY, 0xC9, { KEY_ROTATE_DISPLAY } },       /* rotate key release */
+    { KE_KEY, 0xCC, { KEY_F15 } },                  /* turn display to laptop 
mode */
+    { KE_KEY, 0xCD, { KEY_F16 } },                  /* turn display to tablet 
mode */
        { KE_END },
 };

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https://bugs.launchpad.net/bugs/1629415

Title:
  Broken hardware buttons on Dell XPS 12-9Q33

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