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

Cross-posted to 2 groups.

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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
> exists.

> --- a/hook-functions
> +++ b/hook-functions
> @@ -449,7 +449,7 @@ dep_add_modules()
>         fi
>  
>         # 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
 
/sys/devices/pci0000:00/0000:00:02.0/drm/card0/card0-eDP-1/intel_backlight

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

     $ readlink -f /sys/class/backlight/acpi_video0
     /sys/devices/pci0000:00/0000:00:08.1/0000:26:00.0/backlight/acpi_video0


Kind regards,

Paul


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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Bug#955347: initramfs-tools: initrd size increased due to added DRM drivers Paul Menzel <pmenzel@molgen.mpg.de> - 2020-03-30 12:40 +0200
  Bug#955347: initramfs-tools: initrd size increased due to added DRM drivers Paul Menzel <pmenzel@molgen.mpg.de> - 2020-03-30 13:20 +0200

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