@Estel, it does it after simple opening, just normal usage in a bar , not some kind of stress-test. And it takes about 10 seconds until there is a preview if a reboot does not happen. I've commented the above patches on my build tree and now it takes about 2-3 seconds from black screen to preview. Will give that kernel 1-2 days, and if everything is working, I will start uncommenting the patches one by one, until I find which is the problematic one. But there is a problem, trust me on that (tm).