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Bug#955347: initramfs-tools: initrd size increased due to added DRM drivers

Package: initramfs-tools
Version: 0.136

Dear Debian folks,

The change *Include modules for Chromebook Plus display* [1] caused the DRM drivers to be included on a Intel Broadwell Dell laptop and AMD Ryzen desktop system.

For MODULES=dep: adds backlight and pwm to the dep_modules_add sys-walk.
Walking backlight includes pwm_bl and pwm includes pwm-cros-ec. Since
panel-simple isn't reachable from /sys/class/**, but it can be reached
from /sys/devices/platform/edp-panel, that path is sys-walked if it

--- a/hook-functions
+++ b/hook-functions
@@ -449,7 +449,7 @@ dep_add_modules()
# sys walk some important device classes
-       for class in extcon gpio phy regulator rtc; do
+       for class in backlight extcon gpio phy pwm regulator rtc; do
                for device in "/sys/class/$class"/*; do
                        device="$(readlink -f "$device")" \
                                && sys_walk_mod_add "$device"

On the Intel Broadwell system, the backlight below exists.

    $ readlink -f /sys/class/backlight/intel_backlight


On the desktop system, the ACPI Video Driver `video` (incorrectly) creates the backlight device below.

    $ readlink -f /sys/class/backlight/acpi_video0

Kind regards,


PS: If you reply, please remember to remove <submit@bugs.debian.org> and add the bug address with the assigned number.

[1]: https://salsa.debian.org/kernel-team/initramfs-tools/-/merge_requests/15

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