[Bug 171685] keyboard stops working in kde

[Hector Martin]

https://bugs.kde.org/show_bug.cgi?id=171685


Hector Martin <hector at marcansoft.com> changed:

           What    |Removed                     |Added
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                 CC|                            |hector at marcansoft.com




--- Comment #133 from Hector Martin <hector marcansoft com>  2009-10-17 03:30:30 ---
I can reproduce this too. For the sake of aiding the developers (I hope someone
involved can reproduce this), here are the more important bits of my system
setup:

Gentoo Linux
KDE 4.3.2
uname: Linux raider 2.6.31-gentoo #6 SMP PREEMPT Mon Oct 12 05:49:40 CEST 2009
x86_64 Intel(R) Core(TM)2 Duo CPU P8600 @ 2.40GHz GenuineIntel GNU/Linux
KWin with compositing enabled
NVidia drivers 190.32 (GeForce 9700M GT card)
X.Org X Server 1.6.3.901 (1.6.4 RC 1) Release Date: 2009-8-25
Input devices managed via Hal (not xorg.conf)

The "Alt+Tab quickly" trigger seems to work for me quite reliably. Usually,
when I trigger by accident, I seem to recall it happening after an alt+tab that
closely followed a clipboard action (ctrl+c,alt+tab). Switching desktops or
doing other compositing-heavy actions might help too, though it can definitely
be triggered with compositing off. I think compositing just makes it more
likely to happen.

If you want to trigger it but can't, I suggest very quick alt-tabbing between
applications interspaced with other actions: click on the virtual desktop icons
on the task bar, type something, etc. In general, do stuff quickly while
performing some sort of KWin keyboard action. I have been able to reliably
trigger it 5-6 times in the past few minutes by doing this.

As for workarounds, right clicking on the titlebar works most of the time.
However, I was able to cause mouse activity to hang too at one point (the mouse
moved, but nothing responded to clicks), so I suspect this may also be related
to either mouse grabbing or some sort of broader kwin issue. Switching to a
text terminal and killing/relaunching kwin fixed that one.

I'm pretty rusty on Qt/KDE coding, but if no real developer manages to
reproduce this, I would definitely be willing to work with one to try to track
down and fix the issue.

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