So the problem is that
udl module is loaded to soon during boot and display is not recognized.
Solution is to blacklist the module:
Code:
sudo /etc/modprobe.d/blacklist.conf
Add following lines:
Quote:
blacklist udlfb
blacklist udl
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Than after you login manually load udl module:
After that
Code:
xrandr --listproviders
returns 2 providers:
Quote:
Providers: number : 2
Provider 0: id: 0x54 cap: 0xf, Source Output, Sink Output, Source Offload, Sink Offload crtcs: 2 outputs: 3 associated providers: 1 name:ATI RV730 PRO [Radeon HD 4650] @ pci:0000:01:00.0
Provider 1: id: 0x4f2 cap: 0x2, Sink Output crtcs: 1 outputs: 1 associated providers: 1 name:modesetting
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Now you can use
arandr or
xrandr to configure your displays.