Dummy monitor by raldone01 · Pull Request #423 · DisplayLink/evdi

raldone01 · 2023-06-14T15:09:50Z

This pr is an extension to #421.
It adds a working dummy_monitor script.
It currently requires an edid file.
I would like it to work with just <width>x<height>@<fps>.

pradyvrp · 2024-12-12T09:04:18Z

does this support wayland?

raldone01 · 2024-12-12T09:36:54Z

What do you mean exactly?

The dummy monitor program itself has no issue with wayland as it uses PySide6.
evdi should also not have any issues with wayland as I have used a displaylink docking station yesterday with plasma wayland.

But just try it out?

ESHARK22 · 2025-03-18T06:24:03Z

~~Hey, im wondering what version of python and pyside6 you are using, since I am getting the following error:~~

Oh I just relealized this is might be casued by a mismatched pyevdi version - Could you please update this pr the latest?

Traceback (most recent call last):
  File "/home/eshark/stuff/evdi/evdi/pyevdi/examples/dummy_monitor/dummy_monitor.py", line 201, in <lambda>
    card_timer.timeout.connect(lambda: card.handle_events(0))
                                       ~~~~~~~~~~~~~~~~~~^^^
  File "/home/eshark/stuff/evdi/evdi/pyevdi/examples/dummy_monitor/dummy_monitor.py", line 186, in <lambda>
    card.acquire_framebuffer_handler = lambda buffer: framebuffer_handler(
                                                      ~~~~~~~~~~~~~~~~~~~^
        buffer, my_app
        ^^^^^^^^^^^^^^
    )
    ^
  File "/home/eshark/stuff/evdi/evdi/pyevdi/examples/dummy_monitor/dummy_monitor.py", line 151, in framebuffer_handler
    app.image_buffer_widget.update_image(buffer)
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^
  File "/home/eshark/stuff/evdi/evdi/pyevdi/examples/dummy_monitor/dummy_monitor.py", line 103, in update_image
    image = QImage(buffer.bytes, buffer.width, buffer.height, QImage.Format_RGB32)
TypeError: 'PySide6.QtGui.QImage.__init__' called with wrong argument types:
  PySide6.QtGui.QImage.__init__(PyCapsule, int, int, Format)
Supported signatures:
  PySide6.QtGui.QImage.__init__()
  PySide6.QtGui.QImage.__init__(PySide6.QtGui.QImage, /)
  PySide6.QtGui.QImage.__init__(PySide6.QtCore.QSize, PySide6.QtGui.QImage.Format, /)
  PySide6.QtGui.QImage.__init__(str, int, int, PySide6.QtGui.QImage.Format, /)
  PySide6.QtGui.QImage.__init__(str, int, int, int, PySide6.QtGui.QImage.Format, /)
  PySide6.QtGui.QImage.__init__(Iterable, /)
  PySide6.QtGui.QImage.__init__(Union[bytes, bytearray, memoryview], int, int, PySide6.QtGui.QImage.Format, /, Optional[Callable[..., Any]] = None, Optional[int] = None)
  PySide6.QtGui.QImage.__init__(Union[bytes, bytearray, memoryview], int, int, int, PySide6.QtGui.QImage.Format, /, Optional[Callable[..., Any]] = None, Optional[int] = None)
  PySide6.QtGui.QImage.__init__(Union[str, bytes, os.PathLike[str]], /, Union[bytes, bytearray, memoryview, NoneType] = None)
  PySide6.QtGui.QImage.__init__(int, int, PySide6.QtGui.QImage.Format, /)

mkaspryk-synaptics

Please add a more precise description to this PR.
Here is an example template generated with Copilot that you can use:

Summary: Briefly describe what this PR changes.
Motivation / Context: Explain why the change is needed and what problem it solves.
Related work item: Link the relevant issue, bug, ticket, or user story.
Changes introduced: List the main implementation changes and any important design decisions.
How to test: Provide clear steps, including any required configuration, commands, or test data.
Testing performed: Mention the automated and manual tests that were completed, including the tested environments or platforms.
Expected result: Describe what should be observed after following the test steps.
Screenshots or logs: Include supporting screenshots, logs, or command output where applicable.
Impact and risks: Highlight possible side effects, regression risks, performance impact, or compatibility concerns.
Breaking changes: Indicate whether the PR changes any APIs, configuration, data formats, or existing behavior.
Deployment / Migration notes: Mention any special deployment steps, feature flags, migrations, or rollback considerations.
Documentation: Link the updated documentation or explain why no documentation changes are required.
Reviewer notes: Point out any areas that require particular attention and mention known limitations or planned follow-up work.

Please use it (;

Please remove all dead code and run black and flake8.

If you’re finished, I’ll take another look.

Many thanks for your contribution!

mkaspryk-synaptics · 2026-10-09T13:30:39Z

What is the purpose of having this edid file here in this repository?
Files like EDID should be auto-generated in the code

mkaspryk-synaptics · 2026-10-09T13:34:59Z

This repository is not the best place for files like this one.
Please remove it or change it into a set of unit tests that verify the logic of your change.

mkaspryk-synaptics · 2026-10-09T13:38:09Z

+        # x_size, y_size = buffer.width, buffer.height
+        # for y in range(y_size):
+        #     for x in range(x_size):
+        #         rgb: int = buffer.bytes[y, x]
+        #         bytes = [rgb >> 24, (rgb >> 16) & 0xFF, (rgb >> 8) & 0xFF, rgb & 0xFF]
+        #         color =  QColor(bytes[1], bytes[2], bytes[3])
+        #         self.image.setPixelColor(x, y, color)
+
+        # np_array = np.array(buffer, copy = False) # This is possible thanks to buffer protocol
+        # self.image = QImage(np_array, buffer.width, buffer.height, QImage.Format_RGB32)


Please remove this commented code.

mkaspryk-synaptics · 2026-10-09T13:40:04Z

Please add unit tests for this file.

mkaspryk-synaptics · 2026-10-09T13:44:27Z

Please run black and flake8 and fix PEP8 violations

mkaspryk-synaptics · 2026-10-09T13:46:07Z

Please run black and flake8 and fix PEP8 violations

mkaspryk-synaptics · 2026-10-09T13:46:16Z

Please add copyrights

mkaspryk-synaptics · 2026-10-09T14:20:32Z

This repository isn't the right place for files like launch.json. Please remove it and add a README file on how to use dummy_monitor. Please add it under pyevdi/examples/dummy_monitor

mkaspryk-synaptics · 2026-10-09T14:24:07Z

Please remove settings.json as well and move all needed information to the README file

mkaspryk-synaptics · 2026-10-09T14:30:44Z

+    if options.edid_file:
+      edid = load_edid_file(options.edid_file)
+      connect_ret = card.connect(edid, len(edid), area, area * options.refresh_rate)
+    else:
+      connect_ret = card.connect(None, 0, area, area * options.refresh_rate)


The PR description claims the script should work with just @, but the code path that omits --edid-file still passes None to card.connect().

raldone01 force-pushed the dummy-monitor branch 2 times, most recently from e0779d7 to be9bd64 Compare June 17, 2023 18:49

raldone01 mentioned this pull request Nov 21, 2023

PyEvdi Fixes #421

Merged

raldone01 added 3 commits January 9, 2024 10:45

Initial Dummy Monitor

901c54b

Better scaling.

68aa050

Use lambdas.

32d05c8

raldone01 force-pushed the dummy-monitor branch from dd907e6 to 32d05c8 Compare January 9, 2024 09:45

First two blocks of displayid generator done. Two more to go.

919461a

maitredede mentioned this pull request Nov 4, 2025

Example of a dummy screen #536

Open

mkaspryk-synaptics force-pushed the main branch from fb2ff77 to 558af9c Compare October 2, 2026 10:39

mkaspryk-synaptics reviewed Oct 9, 2026

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raldone01 commented Jun 14, 2023 • edited Loading Uh oh! There was an error while loading. Please reload this page.

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pradyvrp commented Dec 12, 2024

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raldone01 commented Dec 12, 2024

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ESHARK22 commented Mar 18, 2025 • edited Loading Uh oh! There was an error while loading. Please reload this page.

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raldone01 commented Jun 14, 2023 •

edited

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ESHARK22 commented Mar 18, 2025 •

edited

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