Here's 4.11 artful linux kernel with the patch below:
http://people.canonical.com/~khfeng/lp1671360-artful/

I don't think upstream will be happy about this patch, but I'll try =)

But first, I need you guys test it for me.

diff --git a/drivers/pinctrl/pinctrl-amd.c b/drivers/pinctrl/pinctrl-amd.c
index d69e357a7a98..f2b3ed33c65a 100644
--- a/drivers/pinctrl/pinctrl-amd.c
+++ b/drivers/pinctrl/pinctrl-amd.c
@@ -29,6 +29,7 @@
 #include <linux/interrupt.h>
 #include <linux/list.h>
 #include <linux/bitops.h>
+#include <linux/dmi.h>
 #include <linux/pinctrl/pinconf.h>
 #include <linux/pinctrl/pinconf-generic.h>
 
@@ -739,6 +740,26 @@ static struct pinctrl_desc amd_pinctrl_desc = {
        .owner = THIS_MODULE,
 };
 
+static bool amd_gpio_is_gigabyte_am4(void)
+{
+       const char *board_name;
+
+       if (!dmi_match(DMI_BOARD_VENDOR, "Gigabyte Technology Co., Ltd."))
+               return false;
+
+       board_name = dmi_get_system_info(DMI_BOARD_NAME);
+
+       if (!board_name)
+               return false;
+
+       if (strstr(board_name, "A320") ||
+               strstr(board_name, "B350") ||
+               strstr(board_name, "X370"))
+               return true;
+
+       return false;
+}
+
 static int amd_gpio_probe(struct platform_device *pdev)
 {
        int ret = 0;
@@ -746,6 +767,10 @@ static int amd_gpio_probe(struct platform_device *pdev)
        struct resource *res;
        struct amd_gpio *gpio_dev;
 
+       /* Don't load this module if it's a Gigabyte AM4 board */
+       if (amd_gpio_is_gigabyte_am4())
+               return -ENODEV;
+
        gpio_dev = devm_kzalloc(&pdev->dev,
                                sizeof(struct amd_gpio), GFP_KERNEL);
        if (!gpio_dev)

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https://bugs.launchpad.net/bugs/1671360

Title:
  System doesn't boot properly on Gigabyte AM4 motherboards (AMD Ryzen)

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