Xmir: supertux2 has two mouse pointers (one should be hidden)

[dinamic]

2 mouse pointers (one should be hidden)
i've seen this in a lot (all?) the games on mir or Xmir

see attached screenshot

[Daniel van Vugt (vanvugt)]

I'm guessing either the game or SDL2 isn't implementing cursor hiding yet.

[dinamic (dinamic6661)]

could be SDL2/mir, the game is hiding the cursor on X11

[dinamic (dinamic6661)]

here's a screenshot with supertux on X11

[dinamic (dinamic6661)]

Daniel, here's a video with Supertux on X11 and Mir (you can see better the bugs here, 2 mouse pointers, full screen not working) https://www.youtube.com/watch?v=BVhlunj1Evk

[Daniel van Vugt (vanvugt)]

Thanks but no more information needed. We can reproduce it.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Brandon Schaefer (brandontschaefer)]

This is qtmir not hiding its cursor (mir does not control this nor would sdl2)

The code where the SDL mouse hides.
https://hg.libsdl.org/SDL/file/afd286e26823/src/video/mir/SDL_mirmouse.c#l231

[Brandon Schaefer (brandontschaefer)]

Though this is on xmir, it is for sure implemented in the x11 sdl2 code

[Brandon Schaefer (brandontschaefer)]

Where it would happen in sdl2 x11 code.

https://hg.libsdl.org/SDL/file/afd286e26823/src/video/x11/SDL_x11mouse.c#l281

Also if the cursor hides on U7 but not U8, then this is a U8 bug

[Alan Griffiths (alan-griffiths)]

Brandon, assuming the game & SDL work the same on U7 and XMir the problem isn't there. So that's not where I'd be looking.

The things to check are:

1. XMir passes "hide cursor" to mir-client?
2. mir-client passes "hide cursor" to mir-server
3. mir-server passes "hide cursor" to QtMir
4. QtMir passes "hide cursor" to Unity8

A test with another Mir server (e.g. miral-shell) works would determine if the problem is above or below #3.

[Alan Griffiths (alan-griffiths)]

And (testing xenial packages) there are two cursors with miral-shell.

[Daniel van Vugt (vanvugt)]

Tested supertux2 on:

Unity7: one cursor
Xmir: two cursors

Native SDL2 on Mir it just crashes so I can't test that. But given it works in Unity7 it seems the common point of failure is Xmir.

[Daniel van Vugt (vanvugt)]

Related -> bug 1605478

[Brandon Schaefer (brandontschaefer)]

It crashes on native because glew :(... need to fix the assumption that linx == x11

[Alan Griffiths (alan-griffiths)]

You can see the same thing running 7kaa on Xmir. 7kaa hides the cursor fine when run with SDL_VIDEODRIVER=mir.

[dinamic (dinamic6661)]

Mir: 2 pointers

(see attached screenshot)

[dinamic (dinamic6661)]

am i doing something wrong? seems to work for me, 'ubuntu-app-launch supertux2'

[dinamic (dinamic6661)]

installed with libertine, the game is not even playable, right arrow only move tux once and then stops... it looks like keyboard repeat rate is 0? (not to mention that it takes ages to open apps from Xapps)

[dinamic (dinamic6661)]

running side by side, Xmir and MIR (see attachement)

[Daniel van Vugt (vanvugt)]

The current Xmir may indeed have broken key behaviour for some apps. I never found an app that was broken but noticed the mistake in source code and fixed it (will be fixed in the next Xmir). You'll need to wait for the next Xmir release.

Also, we can reproduce this bug now. So there's no need to add any more attachments.

[Daniel van Vugt (vanvugt)]

dinamic: Yes, confirmed holding the arrow keys is broken for supertux2 in the yakkety version of Xmir, but also definitely fixed ready for the next version:
   https://git.launchpad.net/~xmir-team/xorg-server/+git/xmir/commit/?id=f704937aa59132b612a1c4802018b86c98e620ca

[dinamic (dinamic6661)]

yay! :D