Comment 23 for bug 1840889

Since commit ca876c7483b6 ("gpiolib-acpi: make sure we trigger edge events at least once on boot") in the Linux mainline v4.18 kernel (and also in stable v4.14.68 as commit fbb37b72489d) the Linux kernel now calls _AEI edge handlers at boot.

Unfortunately the MINIX Neo Z83-4 mini PC has a DSDT bug where some copy and pasted code for dealing with Micro USB-B connector host/device role switching messes with the DDC data pin from the HDMI connector (switching it to GPIO mode) breaking HDMI support.

For Ubuntu Bionic the mainline kernel change "gpiolib-acpi: make sure we trigger edge events at least once on boot" is included in the Ubuntu-4.15.0-56.61 tag as commit 4ea03f3e93f8 and released in the 4.15.0-58.64 linux package.

Starting with the 4.15.0-58.64 linux package and subsequent linux packages including linux-hwe (4.18 and now 5.0 based) and linux-hwe-edge (5.0 and now 5.2 based) packages Ubuntu fails to boot
with working HDMI on MINIX Neo Z83-4 devices.

To fix this a proposed patch has already been submitted to the mainline kernel linux-gpio team that disables the running of _AEI edge event handlers at boot using a DMI based blacklist with the initial version of this blacklist contains the MINIX Neo Z83-4.

This patch is currently under review. However once accepted and mainlined (and incorporated into stable) it would be appreciated if it can be backported to Ubuntu.