Linux 6.8.2 patch 10431A63 - UX3405MA.304 Sound CS35L41 Workaround For context: In bios version 304 pretty much all the config is present (confirmed via dumping and looking at ssdt16), except for "spk-id-gpios".

linux-sound-UX3405MA.patch

--- ./cs35l41_hda_property.old.c	2024-04-03 15:32:51.000000000 +0200
+++ ./cs35l41_hda_property.c	2024-04-03 20:27:58.179588400 +0200
@@ -83,6 +83,7 @@
 	{ "104317F3", 2, INTERNAL, { CS35L41_LEFT, CS35L41_RIGHT, 0, 0 }, 0, 1, -1, 1000, 4500, 24 },
 	{ "10431863", 2, INTERNAL, { CS35L41_LEFT, CS35L41_RIGHT, 0, 0 }, 1, 2, 0, 1000, 4500, 24 },
 	{ "104318D3", 2, EXTERNAL, { CS35L41_LEFT, CS35L41_RIGHT, 0, 0 }, 0, 1, -1, 0, 0, 0 },
+	{ "10431A63", 2, EXTERNAL, { CS35L41_LEFT, CS35L41_RIGHT, 0, 0 }, -1, 2, -1, 0, 0, 0 },
 	{ "10431A83", 2, INTERNAL, { CS35L41_LEFT, CS35L41_RIGHT, 0, 0 }, 0, 1, -1, 1000, 4500, 24 },
 	{ "10431C9F", 2, INTERNAL, { CS35L41_LEFT, CS35L41_RIGHT, 0, 0 }, 1, 2, 0, 1000, 4500, 24 },
 	{ "10431CAF", 2, INTERNAL, { CS35L41_LEFT, CS35L41_RIGHT, 0, 0 }, 1, 2, 0, 1000, 4500, 24 },
@@ -229,7 +230,7 @@
 
 	dsd_found = acpi_dev_has_props(cs35l41->dacpi);
 
-	if (!dsd_found) {
+	// if (!dsd_found) {
 		ret = cs35l41_add_gpios(cs35l41, physdev, cfg->reset_gpio_index,
 						 cfg->spkid_gpio_index, cfg->cs_gpio_index,
 						 cfg->num_amps);
@@ -237,10 +238,10 @@
 			dev_err(cs35l41->dev, "Error adding GPIO mapping: %d\n", ret);
 			return ret;
 		}
-	} else if (cfg->reset_gpio_index >= 0 || cfg->spkid_gpio_index >= 0) {
+	/*} else if (cfg->reset_gpio_index >= 0 || cfg->spkid_gpio_index >= 0) {
 		dev_warn(cs35l41->dev, "Cannot add Reset/Speaker ID/SPI CS GPIO Mapping, "
 			 "_DSD already exists.\n");
-	}
+	}*/
 
 	if (cs35l41->control_bus == SPI) {
 		cs35l41->index = id;
@@ -420,6 +421,7 @@
 	{ "CSC3551", "104317F3", generic_dsd_config },
 	{ "CSC3551", "10431863", generic_dsd_config },
 	{ "CSC3551", "104318D3", generic_dsd_config },
+	{ "CSC3551", "10431A63", generic_dsd_config },
 	{ "CSC3551", "10431A83", generic_dsd_config },
 	{ "CSC3551", "10431C9F", generic_dsd_config },
 	{ "CSC3551", "10431CAF", generic_dsd_config },

Thanks for this file! That fixed the volume issues on the UX3405ma here. Do you have any plan to submit this to some kernel folks? It'd need modified since it's hacky. Maybe asking the Cirrus Logic people instead that they'd need to fix this.

Also, what do you make of this other solution using an SSDT file https://github.com/smallcms/asus_zenbook_ux3405ma ? Is this something that should be done in addition to your patch? Instead of? Your patch is enough to fix the volume for me, and I'm failing to make their SSDT file work properly here. I've described by problems & attempts there smallcms/asus_zenbook_ux3405ma#7

So far haven't taken the time to do so and unsure when/if I will - as wouldn't be upstreamed like this but with a less hacky patch.
My original hope was they'd just fix that in DSD shipped in bios eventually, but that seems unlikely.
In theory both variants should work, I personally think this one is less "invasive" and "simpler" in some ways.

Alright! That helps to know that both solutions would work. I agree on the kernel approach. I've e-mailed someone at Cirrus Logic that appears to deal with this file & firmware. Hopefully we get guidance : )

I've been hinted where to file a bug, so here it is: https://bugzilla.kernel.org/show_bug.cgi?id=218991

There are a bunch of patches that have been submitted over the weeks doing something very similar to what you're doing, for other laptops. So, that appears to be a classic issue!