[Wayland-bugs] [Bug 106734] Fullscreen GL applications aren't visible with Xwayland, or there's a panel on top (under Weston)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=106734

            Bug ID: 106734
           Summary: Fullscreen GL applications aren't visible with
                    Xwayland, or there's a panel on top (under Weston)
           Product: Wayland
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: XWayland
          Assignee: wayland-bugs at lists.freedesktop.org
          Reporter: eero.t.tamminen at intel.com
        QA Contact: xorg-team at lists.x.org

Setup:
- Skylake i5 (BXT had same issue too)
- Git versions of:
  - kernel (support atomic modesetting)
  - X server / Xwayland
  - Mesa
  - Weston
  (latest releases may be enough, but hasn't been tested)
- New enough dependencies for above, so that modifiers are supported
- GL application supporting fullscreen in both X and Wayland:
  # apt install glmark2 glmar2-wayland

Test-case:
- Start Weston with --xwayland
- Start fullscreen Wayland GL application:
  glmark2-wayland --fullscreen
- Start fullscreen X GL application:
  glmark2 --fullscreen
- Start windowed X GL application:
  glmark2

Expected outcome:
- Fullscreen X GL application works as well through XWayland, as native Wayland
GL applications

Actual outcome:
- Wayland GL application fullscreen window works fine
- X GL application fullscreen window never becomes visible
  - Or with some applications, it appears on random runs, after random delay,
but with Weston panel on top of it instead of as fullscreen
- Windowed X GL application windows work fine

Notes:
- Same thing regardless of whether application uses GLES or GL, glX or EGL
- With some fullscreen GL benchmarks, the window appears after a while, but in
that case it's below the Weston panel i.e. not really fullscreen
  - Whether and when the (non-fullscreen) window appears seems *completely
random*
  - I've seen this most reliably with Ungine Heaven and Valley benchmarks

I haven't tried XWayland before, but I assume it must be a regression.

Xprop and Xwininfo report following for the running invisible glmark2 window:
---------------------
_NET_WM_DESKTOP(CARDINAL) = 0
WM_STATE(WM_STATE):
                window state: Normal
                icon window: 0x0
WM_PROTOCOLS(ATOM): protocols  WM_DELETE_WINDOW
WM_NAME(STRING) = "glmark2 2014.03+git20150611.fa71af2d"
_NET_WM_STATE(ATOM) = _NET_WM_STATE_FULLSCREEN
---------------------
  Absolute upper-left X:  0
  Absolute upper-left Y:  0
  Relative upper-left X:  0
  Relative upper-left Y:  0
  Width: 1920
  Height: 1080
  Depth: 24
  Visual: 0x24
  Visual Class: TrueColor
  Border width: 0
  Class: InputOutput
  Colormap: 0x400001 (not installed)
  Bit Gravity State: ForgetGravity
  Window Gravity State: NorthWestGravity
  Backing Store State: NotUseful
  Save Under State: no
  Map State: IsViewable
  Override Redirect State: no
  Corners:  +0+0  -0+0  -0-0  +0-0
  -geometry 1920x1080+0+0
---------------------
(This was on FullHD monitor.)

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