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vt(4): Call post-switch callback after replacing the backend
[Why] For instance, it gives a chance to the new backend to refresh the screen. This is needed by the vt_drmfb backend and `drm_fb_helper`. This change was lost when I posted changes to reviews.freebsd.org and it broken the amdgpu driver... Thanks to manu@ for reporting the problem and wulf@ to find out the missing change! Tested by: manu Reviewed by: manu Approved by: manu Differential Revision: https://reviews.freebsd.org/D42834
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@ -3283,6 +3283,13 @@ vt_replace_backend(const struct vt_driver *drv, void *softc)
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/* Update windows sizes and initialize last items. */
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vt_upgrade(vd);
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/*
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* Give a chance to the new backend to run the post-switch code, for
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* instance to refresh the screen.
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*/
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if (vd->vd_driver->vd_postswitch)
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vd->vd_driver->vd_postswitch(vd);
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#ifdef DEV_SPLASH
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if (vd->vd_flags & VDF_SPLASH)
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vtterm_splash(vd);
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