If the output backend doesn't support modes, get_preferred_mode will return NULL, and set_mode will accept NULL.
NBKUNVS3OI6G2JXUF2OA2NMA7EKDCHS3O2RKOZAY66HCHWJ4T5KAC UCSTVE5NIAIQ3NJL5YLDFDKDPOCJS6NMAGABSWG67RGCPH47JQEQC D425ND7AT3F7QJ3CCSESMVDOC3J5C5P32M5SJDBHECZJXLHNQ2FAC 7B74AT3BXYB7PVW4F6SGQNPMHOU5TEV5TZ54CG6VSQI46XSEKWXQC ZDQJLNDNDQPWEEWF2QZDRY5LZNJS653SDUQZDHK6EQPH7N4MHXUQC 2QL2H4REDZT46FI3LQ4RYEMQYZBNBK3IC3KH3XERAJU3NCZWMNYQC 7L3TU7JVWPBPHN7WF4TJ263BZ6BC3AYRRW6PULFUP5JZUGWWNUSAC /* Some backends don't have modes. DRM+KMS does, and we need to set a mode* before we can use the output. The mode is a tuple of (width, height,* refresh rate), and each monitor supports only a specific set of modes. We* just pick the monitor's preferred mode, a more sophisticated compositor* would let the user configure it. */if (!wl_list_empty(&wlr_output->modes)) {mode = wlr_output_preferred_mode(wlr_output);wlr_output_set_mode(wlr_output, mode);wlr_output_enable(wlr_output, 1);if (!wlr_output_commit(wlr_output))return;}
/* The mode is a tuple of (width, height, refresh rate), and each* monitor supports only a specific set of modes. We just pick the* monitor's preferred mode; a more sophisticated compositor would let* the user configure it. */wlr_output_set_mode(wlr_output, wlr_output_preferred_mode(wlr_output));