Qt6 platform rendering issues on Ubuntu 22.04
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@JoeCFD Your code builds and runs OK, but when I click on the "Press" button, the label does not change its appearance.
Please post the results of the following commands run in a terminal:
echo $XDG_SESSION_TYPE echo $XDG_SESSION_DESKTOP echo $XDG_CURRENT_DESKTOPAlso:
echo $QT_QPA_PLATFORMThank you!
@Robert-Hairgrove
x11
Lubuntu
LXQt
empty -
Here is a screenshot with an active database in the app built with Qt 5.15, showing the "To do" list with different stages enabled and disabled:
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@Robert-Hairgrove
@SGaist understands this much better than I do, but is your picture #2 (no borders and Qt6.5) somehow "wayland"? Which might not have/do the effects of x11/xcb?@JonB Yes, it is wayland if I do not set
"-platform xcb"as a command line option. -
I forgot to add that the precise version of Qt I have is 6.5.3 which was installed automatically by the Qt Creator maintenance tool.
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I forgot to add that the precise version of Qt I have is 6.5.3 which was installed automatically by the Qt Creator maintenance tool.
@Robert-Hairgrove I guess the problem should be gone if you switch to X11. Do you have to use Wayland? Wayland is the default setting in Ubuntu 22.04.
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@Robert-Hairgrove I guess the problem should be gone if you switch to X11. Do you have to use Wayland? Wayland is the default setting in Ubuntu 22.04.
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@Robert-Hairgrove logout your account. You can see a settings icon on the login screen and click the setting icon to select Xorg. Then log in and you will be good.
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@Robert-Hairgrove logout your account. You can see a settings icon on the login screen and click the setting icon to select Xorg. Then log in and you will be good.
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@Robert-Hairgrove logout your account. You can see a settings icon on the login screen and click the setting icon to select Xorg. Then log in and you will be good.
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@JoeCFD Thanks.
I logged in again with XOrg, but unfortunately the problem persists.
@Robert-Hairgrove did you do:
make distclean
qmake
make
run -
@JoeCFD BTW, what is "LXQt"?
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OK, this must be a bug introduced in 6.5.
I installed Qt versions 6.2.4, 6.3.2, 6.4.3 in addition to 6.5.3 and 6.6.0. Up to 6.4.3, the controls are displayed correctly (enabled=black text, disabled=gray).
Beginning with 6.5.3 and also 6.6.0, the problem arises (everything displays as if enabled, regardless of state).
Looks like I need to file a bug report, but I don't have time today to do it today.
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OK, this must be a bug introduced in 6.5.
I installed Qt versions 6.2.4, 6.3.2, 6.4.3 in addition to 6.5.3 and 6.6.0. Up to 6.4.3, the controls are displayed correctly (enabled=black text, disabled=gray).
Beginning with 6.5.3 and also 6.6.0, the problem arises (everything displays as if enabled, regardless of state).
Looks like I need to file a bug report, but I don't have time today to do it today.
@Robert-Hairgrove
As before, this is only a suggestion. I wonder whether Qt 6.5+ has introduced some change in default so that it is using Wayland over Xorg? And that might be the cause of the changed look? I came across e.g. Qt 6.5 Adding Wayland Native Interfaceand now set to come with Qt 6.5 is support for a Wayland native interface for application developers wanting to interact directly with Wayland object handles.
Did Qt 6.5 become more preferentially Wayland-y than earlier?
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@Robert-Hairgrove
As before, this is only a suggestion. I wonder whether Qt 6.5+ has introduced some change in default so that it is using Wayland over Xorg? And that might be the cause of the changed look? I came across e.g. Qt 6.5 Adding Wayland Native Interfaceand now set to come with Qt 6.5 is support for a Wayland native interface for application developers wanting to interact directly with Wayland object handles.
Did Qt 6.5 become more preferentially Wayland-y than earlier?
@JonB I get the same result regardless of whether I log in using Xorg or Wayland, as far as the enabled/disabled bug is concerned.
If I log in with Xorg, Qt seems to load
xcb, otherwisewaylandis used. I can also specify either platform on the command line; this will change the way some things are displayed, e.g. window border or not, but in every case the bug described above still persists.BTW I also made sure that the
Qt Wayland Compositormodule was included in all of the installations of Qt. I thought not having that installed might have led to the error, but apparently it makes no difference. -
@JonB I get the same result regardless of whether I log in using Xorg or Wayland, as far as the enabled/disabled bug is concerned.
If I log in with Xorg, Qt seems to load
xcb, otherwisewaylandis used. I can also specify either platform on the command line; this will change the way some things are displayed, e.g. window border or not, but in every case the bug described above still persists.BTW I also made sure that the
Qt Wayland Compositormodule was included in all of the installations of Qt. I thought not having that installed might have led to the error, but apparently it makes no difference.@Robert-Hairgrove said in Qt6 platform rendering issues on Ubuntu 22.04:
this will change the way some things are displayed, e.g. window border or not, but in every case the bug described above still persists.
Ah. So it does make a difference as I suspected, but it does not resolve/alter your particular issue.
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OK, this must be a bug introduced in 6.5.
I installed Qt versions 6.2.4, 6.3.2, 6.4.3 in addition to 6.5.3 and 6.6.0. Up to 6.4.3, the controls are displayed correctly (enabled=black text, disabled=gray).
Beginning with 6.5.3 and also 6.6.0, the problem arises (everything displays as if enabled, regardless of state).
Looks like I need to file a bug report, but I don't have time today to do it today.
@Robert-Hairgrove said in Qt6 platform rendering issues on Ubuntu 22.04:
OK, this must be a bug introduced in 6.5.
I installed Qt versions 6.2.4, 6.3.2, 6.4.3 in addition to 6.5.3 and 6.6.0. Up to 6.4.3, the controls are displayed correctly (enabled=black text, disabled=gray).
Beginning with 6.5.3 and also 6.6.0, the problem arises (everything displays as if enabled, regardless of state).
Looks like I need to file a bug report, but I don't have time today to do it today.
Looks like you may have found a regression, you should check the bug report system.
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OK, this must be a bug introduced in 6.5.
I installed Qt versions 6.2.4, 6.3.2, 6.4.3 in addition to 6.5.3 and 6.6.0. Up to 6.4.3, the controls are displayed correctly (enabled=black text, disabled=gray).
Beginning with 6.5.3 and also 6.6.0, the problem arises (everything displays as if enabled, regardless of state).
Looks like I need to file a bug report, but I don't have time today to do it today.
@Robert-Hairgrove I just installed 6.6.0 in Lubuntu 22.04 and my test case runs fine. QLabel is greyed out when it is disabled.
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@Robert-Hairgrove I just installed 6.6.0 in Lubuntu 22.04 and my test case runs fine. QLabel is greyed out when it is disabled.
@JoeCFD I'm glad ... hiowever, I think Lubuntu is not the same as regular Ubuntu?
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Bug report filed today:
https://bugreports.qt.io/browse/QTBUG-118468 -
The default application palette seems to be broken in places with Qt 6.5 and higher.
As a workaround, I serialized the working palette into a file using the
testlabelapp, compiling it with Qt 6.4.3. Then I added the resulting binary file to my application resources. When compiling it with a higher Qt version, I merely overwrite the default palette into the app instance.Seems to work OK; now at least I can do some more serious testing.
