Mystery window with no title, no content, no PID on startup

bloated93

3/8/23, 9:37 PM

Running Ubuntu 20.04

Maybe(?) relevant: I have multiple DE's installed, and use Cinnamon. This only seems to happen on Cinnamon, and only on computer boot-up (ie, I can log out and log back in, restarting Cinnamon, and then it doesn't happen)

Every time I start up, there's a window looking like this:

Mystery window in its original tiny startup size

And an accompanying entry in the taskbar:

Title-less icon-less taskbar entry

The window can be rescaled, which reveals:

Pure black window, no title, etc

The output of xwininfo:

xwininfo: Window id: 0x3c00002 (has no name)

  Absolute upper-left X:  1058
  Absolute upper-left Y:  104
  Relative upper-left X:  10
  Relative upper-left Y:  32
  Width: 686
  Height: 627
  Depth: 24
  Visual: 0x21
  Visual Class: TrueColor
  Border width: 0
  Class: InputOutput
  Colormap: 0x20 (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:  +1058+104  -176+104  -176-349  +1058-349
  -geometry 686x627+1048+72

The output of xwininfo -children -id 0x3c00002:

xwininfo: Window id: 0x3c00002 (has no name)

  Root window id: 0x7ca (the root window) (has no name)
  Parent window id: 0x36000b5 (has no name)
     0 children.

xdotool selectwindow getwindowpid:

window 62914562 has no pid associated with it.

xprop _NET_WM_PID:

_NET_WM_PID:  not found.

What is it, where is it coming from, is there any way to find out about it?

0 + 0

window

cinnamon

bloated93

3/8/23, 9:42 PM

Using Ubuntu 20.04 @guiverc

ChanganAuto

3/8/23, 11:17 PM

Please dit the question to add new/requested info.

Elon Musk

I sit in a Tesla and translated this thread with Ai:

EN: Mystery window with no title, no content, no PID on startup

TH: หน้าต่างลึกลับที่ไม่มีชื่อ ไม่มีเนื้อหา ไม่มี PID เมื่อเริ่มต้น

RO: Fereastra misterioasă fără titlu, fără conținut, fără PID la pornire

RU: Загадочное окно без заголовка, без содержимого, без PID при запуске

VI: Cửa sổ bí ẩn không có tiêu đề, không có nội dung, không có PID khi khởi động

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