Wayland: window decorations don't match window contents #109194
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Reference: blender/blender#109194
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System Information
Operating system: Arch-based Linux, kernel 6.3.7-arch1-1
Graphics card: Intel Arc A779
Blender Version
Broken: blender-3.6.0-beta+v36.2ef27684c56c-linux.x86_64-release, but has happened with all 3.6 daily builds so far.
Worked: 3.5.1, the latest version.
Short description of error
The content area is 1/4 of the window size when the window is first open. 3/4 of the window is transparent.
Gnome 44.2, Wayland, fractional scaling enabled (100%, 175%), dual monitors (1920x1200, 4K).
Exact steps for others to reproduce the error
Run Blender 3.6
Blender 3.6's window has 1/4 content area, 3/4 transparent area.to Blender 3.6's window has 1/4 content area, 3/4 transparent area under LinuxHi! Does the problem still exist if you don't use fractal scaling? Also if you restore and maximize the window again, does the problem persist? Thanks!
On X11 some programs sometimes do this to me as well, like firefox. It feels like it's rendering on the window size that the program creates but it didn't respond to the initial sizing event of the window manager, Wayland might be another story though.
It seems that the problem occurs only when the two monitors have different scalings. That is, if I set both monitors to 100%, to 150%, or to 200%, it does not happen. But If I use different scalings like 100% (left) and 200% (right), it happens.
If I minimise and then restores Blender's window, the content area becomes normal.
This problem does not happen with Blender 3.5.1 (the current version), so I think some changes to the UI introduced in 3.6 is causing this.
PS: Also, when Blender 3.6 starts, it does not start on the main monitor (which is on the right). A big empty grey Blender window starts on the left monitor and part of the window is on the right monitor, and then the Blender's window moves to the right monitor and the content area appears. This problem also does not exist in Blender 3.5.1.
PS2: I tested it with a new OS account, thus with default settings for Blender 3.6. The Blender 3.6 in my main account had settings carried over from Blender 3.5.1. Anyway, strangely, the problem did not happen with the main window under the new OS account. However, when I opened the Edit -> Preferences window, the problem also happened under the new OS account.
Could you try if X11 session has the same issue? (You should be able to select that in the bottom right corner when you login, depending on your display manager program, choose XOrg or X11). This way we can better pin down if this is some change to wayland support in blender or if it's something else.
From the screenshot it looks like it's also not exactly a 1/4 size, so this problem could be related to #108746 and #108643 as well.
X11 does not support per-monitor scalings. That is, all monitors will have the same scalings, so I thought that the problem would not happen in X11, and when I tested it to be sure, it did not happen in X11 as I had expected.
Also, I think the reason why it was not exactly 1/4 is that the scalings were 100% and 175%. I changed the right monitor's scaling to 200% and captured the screenshot below and in an image editing software, I copied the client area and pasted it to the right. It was exactly half the width, so overall it was 1/4. 200% scaling is 2x of 100% scaling in both horizontal and vertical directions, which makes it 1/4.
So, my guess is that, for some reason, Blender 3.6 fits the content area size to the left monitor, but its window size to the right monitor.
@Blender-King thanks for the feedback. Now it looks like indeed the scaling-induced problem. When you drag blender window from one monitor to another (on different fractional scale), does interface size change for you?
From what I can find it's probably something around
outputs_changed_update_scaleandgetClientBounds.Seems to be your territory? @ideasman42
When I started Blender in the bigger monitor, and the main window is showing 1/4 content area, if I move the main window to the smaller monitor, then the content fills the main window (i.e., becomes normal). However, instead of moving the main window, if I open the Preferences window, which is also showing smaller content area, and move that window to the smaller monitor, the content area stays small. (Refer to the attached screen-recording.)
Anyway, I think a faster way is find a Linux computer that has dual monitors and is using Wayland Gnome, set different scalings on both monitors, and run Blender 3.6 there, and maybe open the Preferences window. If everything is fine on that computer, then maybe this is a particular problem of my system.
Recently I resolved a related issue where the Blender window opens the wrong size whenever fractional scaling is used.
See
f95ee3e871.This issue is more involved, from looking into this I think libdecor would have to support fractional scaling for this to work properly (reported upstream https://gitlab.freedesktop.org/libdecor/libdecor/-/issues/60 ).
Setting as a "Known Issue", as I don't think we can resolve on our side unless we remove libdecor entirely and use our own client side decorations.
I don't know; I downloaded and tried Blender 4.0 Beta yesterday, and the problem got worse. Now the context of the main window seems to go beyond the screen when Blender is "maximised". That is, the "Blender 4.0" string, which is supposed to be placed at the centre of the title bar is displayed near the end of the title bar and the object tree/property view are not visible. If I "restore" the window, the window become really big and when I tried to resize it to a smaller size, Blender became unresponsive and then Gnome crashed.
Blender 3.6's window has 1/4 content area, 3/4 transparent area under Linuxto Wayland: window decorations don't match window contents@Blender-King the hack has been removed, replaced by logic that corrects LIBDECOR internal coordinates, with GNOME 45 with 2x monitors set to fractional scaling (175% for e.g.) Blender now works reasonably well.
This still doesn't work well for new windows with multiple monitors that use a different scales though.
So while the issue in this report isn't fixed, in general recent commits should improve window decoration handling.
See:
bafb36f8bc3eda5a114fMay I ask which version of Gnome are you using? My version is 45.0.
If the state goes back to that of pre-4.0, I think it can be tolerated. It was just an annoyance that the initial content size was small, which became normal when Blender's window got redrawn by losing focus or getting minimised/restored. But with 4.0, it made Blender almost impossible to use on my set-up (dual monitors with different fractional scaling).
I'm on GNOME 45, did you check if windowing is working for you since the latest updates?
As mentioned, with 2x monitors of the same fractional scale, windowing should work well, I can still redo problems with monitors of different fractional scales though.