** Description changed:
[ 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,
- | ^~~~~~~~~~~~~~~~~~
+ 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,
- | ^~~~~~~~
+ 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,
- | ^~~~~~~~~~~~~~~~~~~~~~~~
+ 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
+ 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
+ The same procedure should be repeated on linux-6.8 to test for possible
+ regressions.
+
[ 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.
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https://bugs.launchpad.net/bugs/2091294
Title:
ddcci-dkms FTBS in Noble with linux-6.11-hwe kernel
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