DisplayLink Forum - Display HP S410u possible workling with RaspberryPi

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Hmm. Try with something simpler first, e.g. the "example" program that you also built.
This won't show any pixels, but will possibly print more to the console, especially if you
enable debug printout (you need to define DEBUG for the build).

What's closing the app? Is it crashing? If yes, then running it in gdb might give some extra clues.

Cheers,
Michal

Hi Michal,

i've built the evdipp package with debug symbols. The output of the terminal window is at follows:

Code:

(gdb) run

Starting program: /bin/monitorsim edid.dat --enable-debug

[Thread debugging using libthread_db enabled]

Using host libthread_db library "/lib/arm-linux-gnueabihf/libthread_db.so.1".

[libevdi] ioctl: drop_master error=-1

[libevdi] ioctl: drop_master error=-1

[libevdi] ioctl: drop_master error=-1

MESA-LOADER: failed to retrieve device information



Program received signal SIGILL, Illegal instruction.

0x73424de8 in ?? () from /usr/lib/arm-linux-gnueabihf/libcrypto.so.1.0.0

(gdb)

The output from 'example' command of the terminal window is at follows:

Code:

(gdb) run

Starting program: /bin/example EDIDv1_1280x900 --enable-debug

[Thread debugging using libthread_db enabled]

Using host libthread_db library "/lib/arm-linux-gnueabihf/libthread_db.so.1".

Reading the EDID file EDIDv1_1280x900 failed.

[Inferior 1 (process 1822) exited with code 01]

(gdb)

The "edid.dat" is generated with "tvservice -d edid.dat" (for the pluged in HDMI-Monitor).

I hope that helps.

Best regards
Michael

What happens if you use a full path to edid file. The message indicates that the program had problems with opening/reading the file that you gave as an argument?

Cheers,
Michal

Hi Michal,

i'm back from vacation.

Here is the output from 'example' command of the terminal window is at follows:

Code:

(gdb) run

Starting program: /bin/example /home/pi/EDIDv1_1280x900 --enable-debug

[Thread debugging using libthread_db enabled]

Using host libthread_db library "/lib/arm-linux-gnueabihf/libthread_db.so.1".

Reading the EDID file /home/pi/EDIDv1_1280x900 failed.

[Inferior 1 (process 962) exited with code 01]

And the output from 'monitorsim' command of the terminal window is at follows:

Code:

Reading symbols from /bin/monitorsim...done.

(gdb) run

Starting program: /bin/monitorsim /home/pi/EDIDv1_1280x900 --enable-debug

[Thread debugging using libthread_db enabled]

Using host libthread_db library "/lib/arm-linux-gnueabihf/libthread_db.so.1".

Reading the EDID file /home/pi/EDIDv1_1280x900 failed.

[Inferior 1 (process 1018) exited with code 01]

I hope that helps. :confused:

Best regards
Michael

I don't think the file "EDIDv1_1280x900" exists, given that you probably are using EDIDs from Google autotest. You probably meant 1280x800, 1440x900 or 1600x900.

Cheers,
Michal

Hi Michal,

Here is the output from 'example' command of the terminal window is at follows:

Code:

Starting program: /bin/example /home/pi/EDIDv1_1440x900 --enable-debug

[Thread debugging using libthread_db enabled]

Using host libthread_db library "/lib/arm-linux-gnueabihf/libthread_db.so.1".

[libevdi] ioctl: drop_master error=-1

[libevdi] ioctl: drop_master error=-1

Attempting to use device /dev/dri/card1...

[libevdi] ioctl: drop_master error=-1

Press Enter or Ctrl+C to quit...

There was a window without information (title bar with clean and minimal window, to see is a "maximized" symbol as window).

And the output from 'monitorsim' command of the terminal window is at follows:

Code:

(gdb) run

Starting program: /bin/monitorsim /home/pi/EDIDv1_1440x900 --enable-debug

[Thread debugging using libthread_db enabled]

Using host libthread_db library "/lib/arm-linux-gnueabihf/libthread_db.so.1".

[libevdi] ioctl: drop_master error=-1

[libevdi] ioctl: drop_master error=-1

[libevdi] ioctl: drop_master error=-1

MESA-LOADER: failed to retrieve device information



Program received signal SIGILL, Illegal instruction.

0x73424de8 in ?? () from /usr/lib/arm-linux-gnueabihf/libcrypto.so.1.0.0

I hope this information will help you..

Best regards
Michael

Looks like `example` managed to talk to evdi and connected to it. You didn't define DEBUG so the output is minimal.
Not sure why you're getting SIGILL for the Qt app, but it looks like you should perhaps update your pi (https://github.com/raspberrypi/linux/issues/766).

Anyway. With the `example` running, play with `xrandr` to list available outputs and connectors, and see if reverse prime works.

So, in short, keep `example` in the background, and test the following:

xrandr
xrandr --listproviders
xrandr --setprovideroutputsource 1 0
xrandr --auto

...and see how far you get.

Regards,
Michal

Hi Michal,

Here is the output from 'xrandr' command of the terminal window is at follows:

Code:

xrandr

Screen 0: minimum 320 x 200, current 1280 x 1024, maximum 2048 x 2048

HDMI-0 connected 1280x1024+0+0 (normal left inverted right x axis y axis) 359mm x 287mm

   1280x1024     60.02*+

   1280x960      60.00

   1024x768      60.00

   800x600       60.32

   640x480       60.00

   720x400       70.08

Here is the output from 'xrandr --listproviders' command of the terminal window is at follows:

Code:

Providers: number : 1

Provider 0: id: 0x43 cap: 0x2, Sink Output crtcs: 3 outputs: 1 associated providers: 0 name:modesetting

pi@raspberrypi:~ $ sudo modprobe evdi

pi@raspberrypi:~ $ xrandr --listproviders

Providers: number : 1

Provider 0: id: 0x43 cap: 0x2, Sink Output crtcs: 3 outputs: 1 associated providers: 0 name:modesetting

pi@raspberrypi:~ $ xrandr --setprovideroutputsource 1 0

Could not find provider with index 1

Here is the output from 'xrandr --setprovideroutputsource 1 0' command of the terminal window is at follows:

Code:

xrandr --setprovideroutputsource 1 0

X Error of failed request:  BadValue (integer parameter out of range for operation)

  Major opcode of failed request:  140 (RANDR)

  Minor opcode of failed request:  35 ()

  Value in failed request:  0x43

  Serial number of failed request:  16

  Current serial number in output stream:  17

And the 'xrandr --auto' command are without output.

For this test I used a 17 inch monitor and the HP s140u USB monitor.
For a special debug I put up a new image, because I have updated the mesa and libdrm manually.

Best regards
Michael

Hi Michal,

I have built a new image, only with existing packages. I builded evdi module and evdipp without any problems.
The system is an up-to-date Raspian Jessi.

After testing the following commands, there was always the error message: *No usable EVDI found* (The evdi module under lsmod is active.)

Here is the output from 'example' command of the terminal window is at follows:

Code:

#as root:

Starting program: /bin/example /home/pi/EDIDv1_1440x900

[Thread debugging using libthread_db enabled]

Using host libthread_db library "/lib/arm-linux-gnueabihf/libthread_db.so.1".

[libevdi] ioctl: drop_master error=-1

Attempting to use device /dev/dri/card1...

[libevdi] ioctl: drop_master error=-1

Press Enter or Ctrl+C to quit...



#as user:

Starting program: /bin/example /home/pi/EDIDv1_1440x900

[Thread debugging using libthread_db enabled]

Using host libthread_db library "/lib/arm-linux-gnueabihf/libthread_db.so.1".

No usable EVDI found

[Inferior 1 (process 3898) exited with code 02]

No Screen showed up.

And the output from 'monitorsim' command of the terminal window is at follows:

Code:

#as root:

Starting program: /bin/monitorsim /home/pi/EDIDv1_1440x900

[Thread debugging using libthread_db enabled]

Using host libthread_db library "/lib/arm-linux-gnueabihf/libthread_db.so.1".

[libevdi] ioctl: drop_master error=-1

[libevdi] ioctl: drop_master error=-1

[libevdi] ioctl: drop_master error=-1

[libevdi] ioctl: drop_master error=-1

No protocol specified

QXcbConnection: Could not connect to display :0



Program received signal SIGABRT, Aborted.

0x75f89f70 in __GI_raise (sig=sig@entry=6) at ../nptl/sysdeps/unix/sysv/linux/raise.c:56

56      ../nptl/sysdeps/unix/sysv/linux/raise.c: No such file or directory.



#as user:

Starting program: /bin/monitorsim /home/pi/EDIDv1_1440x900

[Thread debugging using libthread_db enabled]

Using host libthread_db library "/lib/arm-linux-gnueabihf/libthread_db.so.1".

No usable EVDI found

[Inferior 1 (process 3864) exited with code 02]

The output from the "xrandr" is the same as in my last post.

I hope this information will help you.

Best regards
Michael

Not being able to use evdi if not running as root is normal. (see note in https://displaylink.github.io/evdi/q...rt/#evdi-nodes)

Not seeing any extra output from "example" is also normal - but while the application is running, it should already be possible to check `xrandr` if you see DVI-*-* connector. Also, what `xrandr --listproviders` shows.

From what monitorsim run as root logs, I think you are running in ssh session, with no DISPLAY set. Run `export DISPLAY=:0` and try again...
Edit: on another look, it complains about not being able to connect to :0, so it might be something else...

Cheers,
Michal