FWIW, the screen switching problems are quite spread to a lot of smaller bugs, which explains why Qt 5.4.2 did not fix everything.
For example, these bugs exist in upstream tracker: https://bugreports.qt.io/browse/QTBUG-46024 https://bugreports.qt.io/browse/QTBUG-42985 https://bugreports.qt.io/browse/QTBUG-47041
A lot of rework to the code in question has happened in Qt 5.5, and now 5.5.1. Qt 5.5.1 is not yet released, but will be targeted to land to Ubuntu after 15.10 release.
FWIW, the screen switching problems are quite spread to a lot of smaller bugs, which explains why Qt 5.4.2 did not fix everything.
For example, these bugs exist in upstream tracker: /bugreports. qt.io/browse/ QTBUG-46024 /bugreports. qt.io/browse/ QTBUG-42985 /bugreports. qt.io/browse/ QTBUG-47041
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A lot of rework to the code in question has happened in Qt 5.5, and now 5.5.1. Qt 5.5.1 is not yet released, but will be targeted to land to Ubuntu after 15.10 release.