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请问am335x lcdc怎么在用户态上动态设置输出分辨率?

使用beagleboneblack,想动态改变HDMI输出的显示分辨率,我在drm_probe_helper.c的drm_helper_probe_single_connector_modes_merge_bits函数中修改count = drm_add_modes_noedid(connector, 800, 600);将HDMI分辨率改为800x600,但怎样在用户态动态修改分辨率呢?使用libdrm?有没有改变分辨率的例子参考下?谢谢