[Bug 2091294] [NEW] ddcci-dkms FTBS in Noble with linux-6.11-hwe kernel

[Launchpad Bug Tracker]

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[ Impact ]

The DKMS does not compile from source in Noble with kernel 6.11:

/var/lib/dkms/ddcci/0.4.4/build/ddcci/ddcci.c:1300:27: error: initialization of ‘int (*)(struct device *, const struct device_driver *)’ from incompatible pointer type ‘int (*)(struct device *, struct device_driver *)’ [-Werror=incompatible-pointer-types]
 1300 |         .match          = ddcci_device_match,
      |                           ^~~~~~~~~~~~~~~~~~
/var/lib/dkms/ddcci/0.4.4/build/ddcci/ddcci.c:1300:27: note: (near initialization for ‘ddcci_bus_type.match’)


/var/lib/dkms/ddcci/0.4.4/build/ddcci-backlight/ddcci-backlight.c:138:10: error: ‘const struct backlight_ops’ has no member named ‘check_fb’
  138 |         .check_fb       = ddcci_backlight_check_fb,
      |          ^~~~~~~~
/var/lib/dkms/ddcci/0.4.4/build/ddcci-backlight/ddcci-backlight.c:138:27: error: initialization of ‘bool (*)(struct backlight_device *, struct device *)’ {aka ‘_Bool (*)(struct backlight_device *, struct device *)’} from incompatible pointer type ‘int (*)(struct backlight_device *, struct fb_info *)’ [-Werror=incompatible-pointer-types]
  138 |         .check_fb       = ddcci_backlight_check_fb,
      |                           ^~~~~~~~~~~~~~~~~~~~~~~~
/var/lib/dkms/ddcci/0.4.4/build/ddcci-backlight/ddcci-backlight.c:138:27: note: (near initialization for ‘ddcci_backlight_ops.controls_device’)

[Test case]

Install the latest linux-6.11 kernel on Noble:

$ sudo add-apt-repository ppa:canonical-kernel-team/ppa
$ sudo apt update
$ sudo apt install linux-image-6.11.0-12-generic \
                   linux-modules-6.11.0-12-generic \
                   linux-modules-extra-6.11.0-12-generic \
                   linux-headers-6.11.0-12-generic

Install ddcci-dkms:

$ sudo apt install ddcci-dkms

Load the module:

$ sudo modprobe ddcci-backlight

[ Fix ]

Patch the code to properly support the new linux 6.11 ABI.

[Regression potential]

DDC/CI is a driver for compatible monitors and their integration into the backlight system class.
We may experience graphical regressions in systems that are using this particular driver with kernel >= 6.11.

** Affects: ddcci-driver-linux (Ubuntu)
     Importance: Undecided
     Assignee: Massimiliano Pellizzer (mpellizzer)
         Status: In Progress

** Affects: ddcci-driver-linux (Ubuntu Noble)
     Importance: Undecided
         Status: In Progress


** Tags: patch
-- 
ddcci-dkms FTBS in Noble with linux-6.11-hwe kernel
https://bugs.launchpad.net/bugs/2091294
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