https://bugs.kde.org/show_bug.cgi?id=396319
Bug ID: 396319
Summary: KWin fails to accept large window icons leading to X11
errors and applications not starting
Product: kwin
Version: 5.12.5
Platform: Debian testing
OS: Linux
Status: UNCONFIRMED
Severity: normal
Priority: NOR
Component: platform-x11-standalone
Assignee: kwin-bugs-n...@kde.org
Reporter: cu...@debian.org
Target Milestone: ---
Flags: X11+, Gallium3D+, Mesa+
I came across a commercial application which tries to set a really large
application icon (2100×1500 pixels). This leads to an X11 error with KWin:
> X Error of failed request: BadLength (poly request too large or internal
> Xlib length error)
> Major opcode of failed request: 146 ()
> Minor opcode of failed request: 74
> Serial number of failed request: 168
> Current serial number in output stream: 168
With xtrace (and setting LIBGL_DRI3_DISABLE=true, without this xtrace was stuck
before logging the error) I was able to dig out the following failing request:
> 003:<: Warning: buffer filled!
> 003:<: Warning: Waiting for rest of package (yet got 65524 of 17640036)!
>003:<: Warning: buffer filled!
>003:<:009d:17640036: Request(18): ChangeProperty mode=Replace(0x00)
>>window=0x07400005 property=0x152("_NET_WM_ICON") type=0x6("CARDINAL")
>data=0x00000834,0x00000834,0x00000000,0x0000000,[...]
Manually scaling the window icon file down, let me start the application.
Now, according to
https://specifications.freedesktop.org/wm-spec/latest/ar01s05.html#idm139870829941264
it is the window managers job to scale the image down and that no maximum size
is mandated by the spec for _NET_WM_ICON. This seems to indicate to me, that an
application is actually free to set such a ridiculously large icon and the
window manager should just scale it down.
[NB: I can trigger this bug also with the Windows version of the application,
if I run it through Wine. This seems to indicate, that Wine isn't scaling the
image down either and also expects the window manager to deal with it.]
Let me know if you need anything else.
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