Package: ddcci-dkms Version: 0.2-1 Severity: important Dear Maintainer,
After installing the ddcci-dkms package, DKMS builds and installs both modules successfully, but the ddcci-backlight module can't be loaded due to symbol lookup errors: > [19754.067449] ddcci_backlight: no symbol version for ddcci_device_write > [19754.067457] ddcci_backlight: Unknown symbol ddcci_device_write (err -22) > [19754.067465] ddcci_backlight: no symbol version for ddcci_register_driver > [19754.067468] ddcci_backlight: Unknown symbol ddcci_register_driver (err -22) > [19754.067475] ddcci_backlight: no symbol version for ddcci_del_driver > [19754.067478] ddcci_backlight: Unknown symbol ddcci_del_driver (err -22) > [19754.067485] ddcci_backlight: no symbol version for ddcci_device_writeread > [19754.067488] ddcci_backlight: Unknown symbol ddcci_device_writeread (err > -22) This might be due to DKMS taking advantages of multiple CPU cores to build both modules in parallel, while the ddcci one needs to be built before the ddcci-backlight one can be. I can reasily reproduce the error by running `make -j2` (or more) on the sources (I get make-time warnings:) > WARNING: "ddcci_del_driver" > [/tmp/ddcci-driver-linux-0.2/ddcci-backlight/ddcci-backlight.ko] undefined! > WARNING: "ddcci_register_driver" > [/tmp/ddcci-driver-linux-0.2/ddcci-backlight/ddcci-backlight.ko] undefined! > WARNING: "ddcci_device_writeread" > [/tmp/ddcci-driver-linux-0.2/ddcci-backlight/ddcci-backlight.ko] undefined! > WARNING: "ddcci_device_write" > [/tmp/ddcci-driver-linux-0.2/ddcci-backlight/ddcci-backlight.ko] undefined! While when I build with a single job (make -j1) it works and produces a loadable ddcci-backlight module. See also https://gitlab.com/ddcci-driver-linux/ddcci-driver-linux/issues/1 Regards, Colomban -- System Information: Debian Release: stretch/sid APT prefers unstable-debug APT policy: (500, 'unstable-debug'), (500, 'unstable'), (500, 'testing'), (500, 'stable') Architecture: amd64 (x86_64) Kernel: Linux 4.6.0-1-amd64 (SMP w/4 CPU cores) Locale: LANG=fr_FR.utf8, LC_CTYPE=fr_FR.utf8 (charmap=UTF-8) Shell: /bin/sh linked to /bin/dash Init: systemd (via /run/systemd/system) Versions of packages ddcci-dkms depends on: ii dkms 2.2.0.3-5 ddcci-dkms recommends no packages. ddcci-dkms suggests no packages. -- no debconf information
