Trackpad is inverted in Linux (Wayland) #107676
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Reference: blender/blender#107676
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System Information
Operating system: Fedora 38
Desktop Environment: GNOME (Wayland)
Graphics card: AMD Radeon RX 5700 XT
Blender Version
Broken: 3.5.1
Short description of error
With natural scrolling enabled in my system settings, scrolling on my touchpad in Blender orbits the scene in the exact opposite direction of where I scroll. If I switch the system configuration to "traditional" scrolling, the direction in Blender feels more... natural.
I'm thinking Blender needs an input setting to invert the touchpad orbit direction. It seems like this is a case where I'd want to override the system's scrolling direction, only in this software. Also, it feels backwards to me because I am used to the way touchpad input is handled on macOS. macOS also has touchpad scroll orbiting AND natural scrolling, and it feels like the Blender interaction on macOS is flipped compared to this. I think Blender may have it wrong on the Linux version.
Exact steps for others to reproduce the error
Use multitouch trackpad on Linux in Wayland to orbit a scene in Blender with natural scrolling. It feels wrong. It feels like the opposite of Blender's default orbit navigation on other systems with natural scrolling and it feels wrong.
This is most likely a duplicate of #104272. From that bug it seems like Blender is ready to go with detecting the setting but it needs upstream Desktop environments to update their Wayland components to at least Wayland 1.22:
Are you able to check which Wayland version you currently have access to under Fedora?
I believe I'm already on 1.22...?
Hmm, in that case, I'll have to defer to the platform module to see what be up here.
CC @ideasman42
@Caden-Mitchell what version of gnome are you using? (the compositor may also needs to support this).
@ideasman42 GNOME 44.2. This is the latest version packaged by Fedora.
Gnome (mutter) doesn't yet support this, reported an issue. Closing as a duplicate of #104272.
@ideasman42 Sorry for the necro bump. I am an avid touchpad user and this issue still affects me. Also, the issue you made for the Mutter project has had no activity since you opened it. Can we please get a Blender preference to "Invert touchpad gestures"? Even if the Mutter issue were resolved, you cannot know for sure that a user who uses natural scrolling globally would even want natural scrolling in Blender. A user could conceivably want Blender to be inverted, or vice versa.
Furthermore, I believe natural scrolling is the de facto default in GNOME and KDE so, if the WM (Mutter in this case) does not advertise a preference, Blender should probably be defaulting to natural scrolling, not inverted scrolling which feels really bad. Presently, Linux touchpad users like my just have to put up with this issue with no satisfactory workaround, eg. preference or system protocol. Ideally, we have both imo.
I only necrobumped this because I see there's already several duplicate issues, and I'd rather re-open this one to have it fixed than throw another one out there in the mix. This issue really bugs me!
Side-note: I used the touchpad gestures EXTENSIVELY on macOS, which is probably why I'm so partial to this. I only use an Apple Magic Touchpad for my Linux desktop, and imo it is generally better integrated in the desktop than macOS, but Blender's distinct lack of support options for touchpad users on Linux makes it a much worse experience for me. To be clear, I don't disagree that the WM should advertise the preference, but Blender desperately needs a solution for its users in the mean time.
@Caden-Mitchell last I looked into this the protocol was still quite new, I'd have expected the major Wayland compositors to have supported it by now.
From testing GNOME/KDE/SWAYWM none of them seem to support it yet.Although it could also be a configuration issue in the case of SWAYWM as checking the code it looks as though it should be supported.EDIT I looked into this again and the reason none of the compositors worked was the version of the seat requested was too old. Committed a fix for this, however only KDE-6 and recent WLROOTS compositors work. GNOME-46 doesn't work though, so a workaround might still be needed.
Submitted a PR to manually set the scroll direction since as far as I can tell this functionality is not yet supported anywhere. !120563
Fixed
8d86fb43a4for compositors that use version 9 or newer of the wl_seat_interface (KDE6 & recent WLROOTS based compositors).There is still the question of supporting a controlling this manually for older compositors but this isn't a bug in Blender.
Committed a workaround for GNOME-46 & KDE 5 (& other Wayland compositors without version 9 of the seat API).
d644873252.