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Old 05-12-2017, 03:40 PM   #1
bab1ch
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Join Date: May 2017
Posts: 2
Default Samsung SyncMaster U70

Hi,

I'm trying to get SyncMaster U70 working with Manjaro distribution, and I have managed to do so once by following Arch DisplayLink Wiki. With some messing and USB reconnect xrandr --listproviders returned 2 providers and it worked well until reboot. I couldn't make it work again since. If I try to reload the udl module, machine often hangs. I'm not sure if U70 is DL-1xxx device?

Code:
/etc/modprobe.d/blacklist.conf
blacklist udlfb
Code:
uname -r
4.10.12-1-MANJARO
Code:
lsusb
Bus 001 Device 002: ID 17e9:0103 DisplayLink
Code:
lsmod | grep udl
udl                    28672  0
drm_kms_helper        126976  2 udl,radeon
drm                   303104  9 udl,radeon,ttm,drm_kms_helper
usbcore               208896  9 udl,uvcvideo,usbhid,ehci_hcd,ohci_pci,xhci_pci,ohci_hcd,xhci_hcd,ehci_pci
Code:
dmesg | grep udl
[   13.113255] [drm:udl_driver_load [udl]] *ERROR* Unrecognized vendor firmware descriptor
[   13.272194] udl 1-1:1.0: fb1: udldrmfb frame buffer device
[   13.272209] [drm] Initialized udl on minor 1
[   13.272261] usbcore: registered new interface driver udl
Code:
xrandr --listproviders
Providers: number : 1
Provider 0: id: 0x54 cap: 0xf, Source Output, Sink Output, Source Offload, Sink Offload crtcs: 2 outputs: 3 associated providers: 0 name:ATI RV730 PRO [Radeon HD 4650] @ pci:0000:01:00.0
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Old 07-20-2017, 08:02 AM   #2
bab1ch
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Join Date: May 2017
Posts: 2
Default

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
Than after you login manually load udl module:

Code:
sudo modprobe udl
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
Now you can use arandr or xrandr to configure your displays.
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