Jonas Ådahl 2c8adb1966 output/kms: Don't attemp to add common modes on connectors without modes
We have no way to sanely add safe modes if there are no modes we can
compare with, thus don't try.

Fixes the following crash:

 #0 are_all_modes_equally_sized at ../src/backends/native/meta-output-kms.c:284
 #1 maybe_add_fallback_modes at ../src/backends/native/meta-output-kms.c:310
 #2 init_output_modes at ../src/backends/native/meta-output-kms.c:347
 #3 meta_output_kms_new at ../src/backends/native/meta-output-kms.c:414
 #4 init_outputs at ../src/backends/native/meta-gpu-kms.c:332
 #5 meta_gpu_kms_read_current at ../src/backends/native/meta-gpu-kms.c:368
 #6 meta_gpu_kms_new at ../src/backends/native/meta-gpu-kms.c:403
 #7 create_gpu_from_udev_device at ../src/backends/native/meta-backend-native.c:461
 #8 init_gpus at ../src/backends/native/meta-backend-native.c:551
 #9 meta_backend_native_initable_init at ../src/backends/native/meta-backend-native.c:632

Fixes: 877cc3eb7d44e2886395151f763ec09bea350444
Related: https://bugzilla.redhat.com/show_bug.cgi?id=2127801
Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/2646>
2022-09-29 14:29:43 +00:00
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