Enable Radeon graphics (hybrid with Intel) card in Debian 9

I have a laptop with hybrid graphics: Intel + AMD Radeon. I am trying to enable Radeon card, however without success. I have installed drivers according to the AtiHowTo - Debian Wiki : xserver-xorg-video-amdgpu firmware-linux-nonfree Command lspci -nn gives the following output: 00:02.0 VGA compatible controller : Intel Corporation Haswell-ULT Integrated Graphics Controller [8086:0a16] (rev 0b) 09:00.0 Display controller : Advanced Micro Devices, Inc. [AMD/ATI] Topaz XT [Radeon R7 M260/M265 / M340/M360 / M440/M445] [1002:6900] (rev ff) ... (other equipment not involved) Command dmesg | grep -E 'drm|radeon' | grep -iE 'firmware|microcode' gives no output. Command xrandr --listproviders gives the following output: Providers: number : 2 Provider 0: id: 0x75 cap: 0xf, Source Output, Sink Output, Source Offload, Sink Offload crtcs: 3 outputs: 3 associated providers: 0 name:modesetting Provider 1: id: 0x4f cap: 0xd, Source Output, Source Offload, Sink Offload crtcs: 0 outputs: 0 associated providers: 0 name:TOPAZ @ pci:0000:09:00.0