mss.exception.ScreenShotError: XGetImage() failed on Debian 10

[ghost]

Trying to run iris from Debian 10 I get an error with XGetImage(). There were no obvious errors when running bootstrap.sh so I assume all the dependencies were properly installed.

(iris_firefox) iris@iris-testing-debian:~/iris_firefox$ iris
Traceback (most recent call last):
  File "/home/iris/.local/share/virtualenvs/iris_firefox-_dt__UE3/bin/iris", line 5, in <module>
    from moziris.scripts.main import main
  File "/home/iris/.local/share/virtualenvs/iris_firefox-_dt__UE3/lib/python3.7/site-packages/moziris/scripts/main.py", line 18, in <module>
    from moziris.api.keyboard.key import KeyModifier
  File "/home/iris/.local/share/virtualenvs/iris_firefox-_dt__UE3/lib/python3.7/site-packages/moziris/api/__init__.py", line 10, in <module>
    from moziris.api.finder.finder import *
  File "/home/iris/.local/share/virtualenvs/iris_firefox-_dt__UE3/lib/python3.7/site-packages/moziris/api/finder/finder.py", line 11, in <module>
    from moziris.api.finder.image_search import image_find, match_template, image_vanish
  File "/home/iris/.local/share/virtualenvs/iris_firefox-_dt__UE3/lib/python3.7/site-packages/moziris/api/finder/image_search.py", line 24, in <module>
    from moziris.api.screen.display import DisplayCollection
  File "/home/iris/.local/share/virtualenvs/iris_firefox-_dt__UE3/lib/python3.7/site-packages/moziris/api/screen/display.py", line 78, in <module>
    DisplayCollection = _get_display_collection()
  File "/home/iris/.local/share/virtualenvs/iris_firefox-_dt__UE3/lib/python3.7/site-packages/moziris/api/screen/display.py", line 64, in _get_display_collection
    res.append(Display(index))
  File "/home/iris/.local/share/virtualenvs/iris_firefox-_dt__UE3/lib/python3.7/site-packages/moziris/api/screen/display.py", line 19, in __init__
    self.scale = _get_scale(screen_id)
  File "/home/iris/.local/share/virtualenvs/iris_firefox-_dt__UE3/lib/python3.7/site-packages/moziris/api/screen/display.py", line 72, in _get_scale
    screenshot = mss.mss().grab(display)
  File "/home/iris/.local/share/virtualenvs/iris_firefox-_dt__UE3/lib/python3.7/site-packages/mss/linux.py", line 430, in grab
    ZPIXMAP,
  File "/home/iris/.local/share/virtualenvs/iris_firefox-_dt__UE3/lib/python3.7/site-packages/mss/linux.py", line 171, in validate
    raise ScreenShotError(err, details=details)
mss.exception.ScreenShotError: XGetImage() failed

[KWierso]

Sounds similar to https://stackoverflow.com/questions/55085064/xgetimage-failed-error-when-using-python-mss-library-on-ubuntu

Wonder if you can try installing a different version of mss and get it to work? We're using debian10 in CI, so it should be working.

[ghost]

I tried installing some older versions (mss 4.0.2, 4.0.1, and 4.0.0) but I got the same traceback as above. Note, Iris appears to require mss 4.0.3 as when I install an older version I get an error: "ERROR: moziris 0.6 has requirement mss==4.0.3, but you'll have mss 4.0.1 which is incompatible."

[ghost]

I think I found the problem. On Debian 10 Wayland is the default whereas on Ubuntu 16.04 it is X11. Logging out on Debian 10 and switching to a GNOME X11 session got this working. I'm going to file an issue for us to add support for Wayland since that is the default on many a Linux distribution.