Strange black smudge in the top left of the screen (Cinnamon)

Ketchup901 · 2019-08-30 15:53:51

I have this black/grey box in the top left of my screen:
https://0x0.st/z4f8.png
It disappears after rebooting, but it appears again after some time (not sure exactly what causes it). Any idea what this is?

Mod Edit - Replaced oversized image with link.
CoC - Pasting pictures and code

seth · 2019-08-30 18:37:46

Please replace the image w/ a link and/or thumbnail (forum rules allow 200x200px)

Does it appear on a screenshot?
Is this on X11?
If so, what's the ouput of "xwininfo" and "xprop" when you click into the area? (Please post that in "code" tags)

About the photo: why is there a person in the image? Wallpaper? Or was this taken w/ the webcam of the device??

Ketchup901 · 2019-08-30 19:39:15

Output of xwininfo:

$ xwininfo

xwininfo: Please select the window about which you
          would like information by clicking the
          mouse in that window.

xwininfo: Window id: 0x3a00009 "Desktop"

  Absolute upper-left X:  0
  Absolute upper-left Y:  0
  Relative upper-left X:  0
  Relative upper-left Y:  0
  Width: 2560
  Height: 1408
  Depth: 32
  Visual: 0x82
  Visual Class: TrueColor
  Border width: 0
  Class: InputOutput
  Colormap: 0x3a00008 (not installed)
  Bit Gravity State: NorthWestGravity
  Window Gravity State: NorthWestGravity
  Backing Store State: NotUseful
  Save Under State: no
  Map State: IsViewable
  Override Redirect State: no
  Corners:  +0+0  -0+0  -0-32  +0-32
  -geometry 2560x1408+0+0

Output of xprop:

_NET_WM_ICON(CARDINAL) =        Icon (32 x 32):
                                        
                                        
        ▒▒▒▒▒▒▒▒▒▒▒░░░░░░░░░░░░░░░░░░░░▒
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XKLAVIER_STATE(INTEGER) = 0, 225589504
WM_STATE(WM_STATE):
                window state: Normal
                icon window: 0x0
_NET_WM_DESKTOP(CARDINAL) = 4294967295
_GTK_EDGE_CONSTRAINTS(CARDINAL) = 170
_NET_WM_STATE(ATOM) = _NET_WM_STATE_SKIP_PAGER, _NET_WM_STATE_SKIP_TASKBAR, _NET_WM_STATE_STICKY
_NET_WM_ALLOWED_ACTIONS(ATOM) = _NET_WM_ACTION_CHANGE_DESKTOP, _NET_WM_ACTION_ABOVE, _NET_WM_ACTION_BELOW
WM_HINTS(WM_HINTS):
                Client accepts input or input focus: True
                Initial state is Normal State.
                bitmap id # to use for icon: 0x3a0023a
                bitmap id # of mask for icon: 0x3a00240
                window id # of group leader: 0x3a00001
_GTK_THEME_VARIANT(UTF8_STRING) = 
XdndAware(ATOM) = BITMAP
_GTK_WINDOW_OBJECT_PATH(UTF8_STRING) = "/org/NemoDesktop/window/1"
_GTK_APPLICATION_OBJECT_PATH(UTF8_STRING) = "/org/NemoDesktop"
_GTK_UNIQUE_BUS_NAME(UTF8_STRING) = ":1.65"
_GTK_APPLICATION_ID(UTF8_STRING) = "org.NemoDesktop"
_NET_WM_OPAQUE_REGION(CARDINAL) = 
_MOTIF_WM_HINTS(_MOTIF_WM_HINTS) = 0x2, 0x0, 0x0, 0x0, 0x0
_NET_WM_WINDOW_TYPE(ATOM) = _NET_WM_WINDOW_TYPE_DESKTOP
_NET_WM_SYNC_REQUEST_COUNTER(CARDINAL) = 60817419, 60817420
_NET_WM_USER_TIME_WINDOW(WINDOW): window id # 0x3a0000a
WM_CLIENT_LEADER(WINDOW): window id # 0x3a00001
_NET_WM_PID(CARDINAL) = 1677
WM_LOCALE_NAME(STRING) = "en_US.UTF-8"
WM_CLIENT_MACHINE(STRING) = "AdamPC-Archlinux"
WM_NORMAL_HINTS(WM_SIZE_HINTS):
                program specified location: 0, 0
                program specified minimum size: 2560 by 1408
                program specified maximum size: 2560 by 1408
                program specified base size: 0 by 0
                window gravity: NorthWest
WM_PROTOCOLS(ATOM): protocols  WM_DELETE_WINDOW, WM_TAKE_FOCUS, _NET_WM_PING, _NET_WM_SYNC_REQUEST
WM_CLASS(STRING) = "nemo-desktop", "Nemo-desktop"
WM_ICON_NAME(STRING) = "Desktop"
_NET_WM_ICON_NAME(UTF8_STRING) = "Desktop"
WM_NAME(STRING) = "Desktop"
_NET_WM_NAME(UTF8_STRING) = "Desktop"

The image was taken while watching a Youtube video because it was easier to see that way. There's no particular reason for there being a person.

seth · 2019-08-30 20:16:55

That's your desktop window. Since the image didn't show your desktop, the artifact is either an output-only window, in your compositor or the scanout buffer.

a) Does it appear on screenshots?
b) can you replace muffin w/ another WM (eg. openbx)? Does it show up there?

Ketchup901 · 2019-08-31 05:56:20

What do you mean? The image linked is a screenshot, so yes it does appear in screenshots.
I don't know if using a different WM would fix the issue because if I restart cinnamon, the box disappears temporarily. I'll try switching and see if it comes back.

seth · 2019-08-31 06:02:42

Given the blurriness, I thought it rather was a photo of the screen?
How big is that area actually?

Edit: in pixels.

Last edited by seth (2019-08-31 06:03:04)

Arch Linux

#1 2019-08-30 15:53:51

Strange black smudge in the top left of the screen (Cinnamon)

#2 2019-08-30 18:37:46

Re: Strange black smudge in the top left of the screen (Cinnamon)

#3 2019-08-30 19:39:15

Re: Strange black smudge in the top left of the screen (Cinnamon)

#4 2019-08-30 20:16:55

Re: Strange black smudge in the top left of the screen (Cinnamon)

#5 2019-08-31 05:56:20

Re: Strange black smudge in the top left of the screen (Cinnamon)

#6 2019-08-31 06:02:42

Re: Strange black smudge in the top left of the screen (Cinnamon)

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