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Before updating the display from the console's shadow buffer, the dirty worker now waits for a vblank. This allows several screen updates to pile up and acts as a rate limiter. If a DRM master is present, it could interfere with the vblank. Don't wait in this case. v4: * share code with WAITFORVSYNC ioctl (Emil) * use lock guard v3: * add back helper->lock * acquire DRM master status while waiting for vblank v2: * don't hold helper->lock while waiting for vblank Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de> Acked-by: Sam Ravnborg <sam@ravnborg.org> Link: https://lore.kernel.org/r/20250829091447.46719-1-tzimmermann@suse.de