On 27/03/17 10:43, Daniel Vetter wrote: > With atomic we've stopped killing the entire CRTC when you the last > userspace reference for the framebuffer on the primary plane disappears, > but just shut down the primary plane. Assuming the driver can do that, we > fall back to full CRTC shutdown if not. That avoids a pile of flickering > and unecessary modesets. > > But yeah downside is that the crtc is active even when unloading. Note Not only that, but also when you stop a DRM userspace app and don't start a new one, the crtc stays active. Maybe that's not so common scenario, but I wouldn't be that surprised if on embedded world someone only runs a DRM app when they're showing something, and no app in between the runs. What makes the behavior a bit funny is that if I boot without fbdev emulation, the crtcs stay off (as they should). But run a DRM app, quit it, and the crtcs are on. This is a bit related to the other annoyance, which is that we don't reset properties when a DRM app quits. I think the state of the HW should be restored to exactly the same state as it was (including turning off the crtcs). I'm planning to have a look at this whenever I happen to find some time... Tomi
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