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#1 2012-01-22 20:12:46

gjasso
Member
From: Bonn, Germany
Registered: 2011-09-08
Posts: 29

[SOLVED] Problem configuring DisplayLink monitor (udlfb...)

SOLVED:

It seems that my monitor shows no green screen when it is ready. Instead it shows the last image rendered. In my case it was this color stripes.

Also, I upgraded to kernel 3.2.1-2, and using the include module udlfb and xf86-video-fbdev from the official repositories I made it work.

----------------------------------
I'm struggling to configure a Green House DisplayLink monitor to work with a netbook with an eGalaxTouchscreen. It seems I have problems with udlfb and the DisplayLink driver.

Following this artilce in the wiki, I installed udlfb and xf86-video-fbdev-for-displaylink from the AUR.

Loading the module with 

# modprobe udlfb fb_defio=1

does not give any problem:

dmesg
-----
[  509.963703] usbcore: registered new interface driver udlfb

Plugging the monitor after loading the driver gives the following output:

dmesg
-----
[  637.363419] usb 1-1: new high speed USB device number 6 using ehci_hcd
[  637.470050] usb 1-1: device descriptor read/64, error -32
[  637.701889] udlfb: DisplayLink GH-USD16K - serial #USD16K3310398
[  637.701899] udlfb: vid_17e9&pid_016b&rev_0196 driver's dlfb_data struct at f377b800
[  637.701905] udlfb: console enable=0
[  637.701909] udlfb: fb_defio enable=1
[  637.702124] udlfb: vendor descriptor length:17 data:17 5f 01 0015 05 00 01 03 00 04
[  637.702132] udlfb: DL chip limited to 1500000 pixel modes
[  637.702251] udlfb: allocated 4 65024 byte urbs
[  637.785022] udlfb: 1366x768 valid mode
[  637.785034] udlfb: Reallocating framebuffer. Addresses will change!
[  637.788011] udlfb: 1366x768 valid mode
[  637.788019] udlfb: set_par mode 1366x768
[  637.793145] udlfb: DisplayLink USB device /dev/fb1 attached. 1366x768 resolution. Using 4104K framebuffer memory

But there is no visible change, the screen remains black. Nevertheless, there is a new entry /dev/fb1 as advertised. I followed the steps of the article but I didn't suceed. As I understand, the green screen assures you that udlfb is properly loaded and that the monitor is ready to use.

It seems that it is sadly not my case. Another strange thing is that if I load udlfb, then unload it and load it back again the monitor diplays green, blue, red and yellow stripes. But not the green screen.

I attach my xorg configuration, just in case.

/etc/X11/xorg.conf.d/10-monitor.conf
# eGalax TouchScreen
Section "Monitor"
    Identifier    "LVDS1"
EndSection

Section "Device"
    Identifier    "eGalaxTouchscreen"
    Driver        "intel"
    BusID	  "PCI:0:2:0"
EndSection

Section "Screen"
    Identifier    "eGalaxScreen"
    Device        "eGalaxTouchscreen"
    Monitor       "LVDS1"
    DefaultDepth  16 
    SubSection "Display"
        Depth     16
        Modes     "1366x768"
    EndSubSection
EndSection

# Green House DisplayLink Monitor
Section "Monitor"
    Identifier    "GreenHouseMonitor"
EndSection

Section "Device"
    Identifier    "GreenHouseMonitor"
    Driver	  "fbdev"
    BusID	  "USB"
    Option	  "fbdev" "/dev/fb1"
#    Option	  "rotate" "CCW"
EndSection

Section "Screen"
    Identifier    "GreenHouseScreen" 
    Device        "GreenHouseMonitor"
    Monitor       "GreenHouseMonitor"
    DefaultDepth  16
    SubSection "Display"
        Depth     16
        Modes     "1366x768"                                 
    EndSubSection
EndSection

# Dual Monitor configuration
#Section "ServerLayout"
#    Identifier	"eGalaxAsMainDisplay"
#    Screen	0	"eGalaxScreen"
#    Screen	1	"GreenHouseScreen" RightOf "eGalaxScreen"
#    Option	"Xinerama" "on"
#EndSection

Section "ServerLayout"
    Identifier	"GreenHouseAsMainDisplay"
    Screen	0	"GreenHouseScreen"
    Screen	1	"eGalaxScreen" RightOf "GreenHouseScreen"
    Option	"Xinerama" "on"
EndSection

Last edited by gjasso (2012-01-25 13:22:29)

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#2 2012-02-26 20:21:59

wasutton3
Member
Registered: 2011-03-19
Posts: 27

Re: [SOLVED] Problem configuring DisplayLink monitor (udlfb...)

Can you detail more precisely how you got it to work? I cannot seem to get randr to recognize the new display

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#3 2012-03-09 01:00:27

gjasso
Member
From: Bonn, Germany
Registered: 2011-09-08
Posts: 29

Re: [SOLVED] Problem configuring DisplayLink monitor (udlfb...)

I use my DisplayLink monitor with a netbook. The best I can get at the moment is to use the DL monitor as my primary monitor in a []single monitor setup[]. This means that my netbook's monitor is not used at all (although in my case it is not vital, I would like it to work for watching videos or writing LaTeX code in the smaller screen with a big font size and read the preview in the bigger one).

This is the Xorg file I use:

/etc/X11/xorg.conf.d/10-monitor.conf
-----
# DisplayLink Monitor
Section "Device"
    Identifier    "DisplayLink"
    Driver	  "fbdev"
    BusID	  "USB"
    Option	  "fbdev" "/dev/fb1"
EndSection

Section "Monitor"
    Identifier    "Secondary Monitor"
EndSection

Section "Screen"
    Identifier    "External Screen" 
    Device        "DisplayLink"
    Monitor       "Secondary Monitor"
    DefaultDepth  16
    SubSection "Display"
        Depth     16
        Modes     "1366x768"
#	Virtual	  4096 4096
    EndSubSection
EndSection

# eGalax Touchscreen
Section "Device"
    Identifier    "Integrated Graphics Controller"
    Driver        "intel"
EndSection

Section "Monitor"
    Identifier    "Primary Monitor"
EndSection

Section "Screen"
    Identifier    "Internal Screen"
    Device        "Integrated Graphics Controller"
    Monitor       "Primary Monitor"
    DefaultDepth  16 
    SubSection "Display"
        Depth     16
        Modes     "1366x768"
	Virtual	  2732 768
    EndSubSection
EndSection

# Dual Monitor configuration
Section "ServerLayout"
    Identifier	"Dual Head Setup"
#    Screen	"Internal Screen"
#    Screen	"External Screen" RightOf "Internal Screen"
    Screen	"External Screen"
#    Screen	"Internal Screen" LeftOf "External Screen"
#    Screen	"Internal Screen" LeftOf "External Screen"
#    Option	"Xinerama" "on"
#    Option	"Clone"	   "off"
EndSection

I use xf86-input-fbdev for the DL monitor.

This has one major drawback: I've found no way to make this work dynamically, so I need to move/rename or edit this file whenever I want to change my setup (twice a day in my case). It is not absolutely unbearable but it is an unsatisfactory solution nevertheless.

Also, if I understood correctly, this seems to be a limitation of the current drivers (which include no 3D accel., so no GNOME shell for example). If you find a better way to do it (specially to detect the other monitor dynamically) please let me know.

PS: Sorry for the late response, I was on vacation.

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#4 2012-04-06 03:07:11

android
Member
From: San Diego
Registered: 2003-04-18
Posts: 160

Re: [SOLVED] Problem configuring DisplayLink monitor (udlfb...)

gjasso,

I think you can make both monitors work at the same time using xinerama.

displaylink display does need to be "Screen 0"

This is the config file working for me. 

Section "ServerLayout"
        Identifier      "Server Layout"
        Screen  0       "DisplayLinkScreen" 0 0
        Screen  1       "DefaultScreen" RightOf "DisplayLinkScreen"
        Option          "Xinerama" "On"
EndSection

Section "Device"
        Identifier      "Configured Video Device"
        Driver          "fbdev"
#       Option  "rotate"        "CW"
#       Option  "rotate"        "UD"
EndSection

Section "Monitor"
        Identifier      "Configured Monitor"
EndSection

Section "Screen"
        Identifier      "DefaultScreen"
        Monitor         "Configured Monitor"
        Device          "Configured Video Device"
        DefaultDepth    16
        SubSection "Display"
                Depth   16
                Modes   "800x480"
        EndSubSection
EndSection

Section "Device"
        Identifier      "DisplayLinkDevice"
        driver          "fbdev"
        BusID   "USB"
        Option  "fbdev" "/dev/fb3"
#       Option  "rotate"        "CCW"
#       Option  "rotate"        "UD"
EndSection

Section "Monitor"
        Identifier      "DisplayLinkMonitor"
        DisplaySize 152 80    # In millimeters
EndSection

Section "Screen"
        Identifier      "DisplayLinkScreen"
        Device          "DisplayLinkDevice"
        Monitor         "DisplayLinkMonitor"
        DefaultDepth    16
        SubSection "Display"
                Depth   16
                Modes   "800x480"
        EndSubSection
EndSection

You may need to change "DefaultScreen" driver from "fbdev" to "intel", and change DisplaySize and Modes. I think Depth needs to be 16. Also change: Option  "fbdev" "/dev/fb3", to the device of the displaylink framebuffer on your system (probably /dev/fb1).

As you can see, this uses standard fbdev driver for displaylink.

It works well here. It should work for you too. Good luck!

EDIT: clarify which driver to change

Last edited by android (2012-04-06 16:16:09)

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#5 2012-04-06 07:06:46

gjasso
Member
From: Bonn, Germany
Registered: 2011-09-08
Posts: 29

Re: [SOLVED] Problem configuring DisplayLink monitor (udlfb...)

Thank you android, I will try latter when I get to my computer.

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#6 2014-10-27 20:51:17

kc7noa
Member
Registered: 2014-09-05
Posts: 4

Re: [SOLVED] Problem configuring DisplayLink monitor (udlfb...)

I still cant get it to work ......

DL-165 ....

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#7 2014-10-29 13:21:23

fsckd
Forum Fellow
Registered: 2009-06-15
Posts: 4,173

Re: [SOLVED] Problem configuring DisplayLink monitor (udlfb...)

kc7noa, please start a new thread.
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Closing.

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