[Bug 2133812] Re: evdi-dkms FTBS in Noble with the linux-6.17-hwe kernel

[Timo Aaltonen]

Hello John, or anyone else affected,

Accepted evdi into noble-proposed. The package will build now and be
available at
https://launchpad.net/ubuntu/+source/evdi/1.14.2+dfsg-1ubuntu1.4 in a
few hours, and then in the -proposed repository.

Please help us by testing this new package.  See
https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how
to enable and use -proposed.  Your feedback will aid us getting this
update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug,
mentioning the version of the package you tested, what testing has been
performed on the package and change the tag from verification-needed-
noble to verification-done-noble. If it does not fix the bug for you,
please add a comment stating that, and change the tag to verification-
failed-noble. In either case, without details of your testing we will
not be able to proceed.

Further information regarding the verification process can be found at
https://wiki.ubuntu.com/QATeam/PerformingSRUVerification .  Thank you in
advance for helping!

N.B. The updated package will be released to -updates after the bug(s)
fixed by this package have been verified and the package has been in
-proposed for a minimum of 7 days.

** Changed in: evdi (Ubuntu Noble)
       Status: In Progress => Fix Committed

** Tags added: verification-needed verification-needed-noble

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https://bugs.launchpad.net/bugs/2133812

Title:
  evdi-dkms FTBS in Noble with the linux-6.17-hwe kernel

Status in evdi package in Ubuntu:
  Invalid
Status in evdi source package in Noble:
  Fix Committed
Status in evdi source package in Questing:
  Invalid
Status in evdi source package in Resolute:
  Invalid

Bug description:
  [ Impact ]

  DKMS make.log for evdi-1.14.2+dfsg for kernel 6.17.0-7-generic (x86_64)
  Wed Dec  3 18:21:40 UTC 2025
  make: Entering directory '/usr/src/linux-headers-6.17.0-7-generic'
  make[1]: Entering directory '/var/lib/dkms/evdi/1.14.2+dfsg/build'
  warning: the compiler differs from the one used to build the kernel
    The kernel was built by: x86_64-linux-gnu-gcc-13 (Ubuntu 13.3.0-6ubuntu2~24.04) 13.3.0
    You are using:           gcc-13 (Ubuntu 13.3.0-6ubuntu2~24.04) 13.3.0
    CC [M]  evdi_platform_drv.o
    CC [M]  evdi_platform_dev.o
    CC [M]  evdi_sysfs.o
    CC [M]  evdi_modeset.o
    CC [M]  evdi_connector.o
    CC [M]  evdi_encoder.o
  evdi_modeset.c:506:22: error: initialization of ‘struct drm_framebuffer * (*)(struct drm_device *, struct drm_file *, const struct drm_format_info *, const struct drm_mode_fb_cmd2 *)’ from incompatible pointer type ‘struct drm_framebuffer * (*)(struct drm_device *, struct drm_file *, const struct drm_mode_fb_cmd2 *)’ [-Werror=incompatible-pointer-types]
    506 |         .fb_create = evdi_fb_user_fb_create,
        |                      ^~~~~~~~~~~~~~~~~~~~~~
  evdi_modeset.c:506:22: note: (near initialization for ‘evdi_mode_funcs.fb_create’)
    CC [M]  evdi_drm_drv.o
  cc1: some warnings being treated as errors
  make[3]: *** [/usr/src/linux-headers-6.17.0-7-generic/scripts/Makefile.build:287: evdi_modeset.o] Error 1
  make[3]: *** Waiting for unfinished jobs....
  evdi_connector.c:165:23: error: initialization of ‘enum drm_mode_status (*)(struct drm_connector *, const struct drm_display_mode *)’ from incompatible pointer type ‘enum drm_mode_status (*)(struct drm_connector *, struct drm_display_mode *)’ [-Werror=incompatible-pointer-types]
    165 |         .mode_valid = evdi_mode_valid,
        |                       ^~~~~~~~~~~~~~~
  evdi_connector.c:165:23: note: (near initialization for ‘evdi_connector_helper_funcs.mode_valid’)
  cc1: some warnings being treated as errors
  make[3]: *** [/usr/src/linux-headers-6.17.0-7-generic/scripts/Makefile.build:287: evdi_connector.o] Error 1
  make[2]: *** [/usr/src/linux-headers-6.17.0-7-generic/Makefile:2016: .] Error 2
  make[1]: *** [/usr/src/linux-headers-6.17.0-7-generic/Makefile:248: __sub-make] Error 2
  make[1]: Leaving directory '/var/lib/dkms/evdi/1.14.2+dfsg/build'
  make: *** [Makefile:248: __sub-make] Error 2
  make: Leaving directory '/usr/src/linux-headers-6.17.0-7-generic'

  [ Test case ]

  Install the latest linux-6.17 kernel on Noble:

  $ sudo add-apt-repository ppa:canonical-kernel-team/ppa3
  $ sudo apt install linux-generic-hwe-24.04-edge

  Install evdi-dkms:

  $ sudo apt install evdi-dkms

  Module built and installed successfully.

  Load the modules:

  $ sudo modprobe evdi

  Module loaded successfully.

  The same procedure must be repeated on linux-6.8 to test for possible
  regressions.

  [ Fix ]

  Apply patch from evdi-dkms Questing release enabling 6.17

  * debian/patches/Fix-build-for-kernel-v6.17-rc1.patch

  Apply patch from upstream evdi (https://github.com/DisplayLink/evdi/commit/248b223fe310fcd4f63b967142330231029878e6)
  * debian/patches/Fix-building-on-future-kernel-6.15.patch

  [ Regression potential ]

  We may experience regressions in systems that are using the evdi
  drivers, especially with kernels >= 6.8 kernel.

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