Nothing, my head hurts from trying it, I just have to leave it in CSM mode although I have found a way that when the screen is distorted, I press the power button, the screen is suspended, I press a key and that's the perfect screen.
SMBIOS and BDW framebuffer layout are fine, anyway, now when I'm calmer I'll look at how to install the sound drivers (AL290) and tomorrow the RTS5227 laptop card reader.
Thank you for your patience.
Notebook specifications:
Intel Core i7-5500U 2.4-3.0GHz dual-core
Intel HD Graphics 5500 + NVIDIA GeForce GTX 850M 4GB DDR3 (Optimus)
17.3" 16:9, 1920x1080 LCD
16GB RAM
Realtek RTL8168/8111 Gigabit Ethernet
Intel 7260 wireless
Realtek RTS5227 SD card reader
2 SSD, 1 M.2
Realtek ALC290 Audio
3 USB 3.0 / 3.1 Gen1
1 HDMI
Audio combo jack
1 fingerprint reader