I can confirm.

In Intrepid, on a Samsung Q1 UMPC (the original Celeron-M 900 version),
gksu fails almost every time it runs -- which makes various
administrative tasks difficult to perform, obviously.

The Q1 is a keyboard-less tablet "ultra mobile PC."  I have "password
dialogs as normal windows" enabled in Assistive Technologies because I
use an onscreen keyboard (OnBoard).

When running a GUI program that requires root privileges, the password
dialog pops up as expected, and I can use the on-screen keyboard to
enter the password.  Upon pressing "Enter" or "OK", the desktop stops
responding normally -- it essentially "freezes up."

After that, I can sometimes launch applications from the Gnome panel,
but in most cases those applications will pop up an unresponsive window
that takes no input.  I can also usually switch focus and raise windows
by clicking on them (compiz is the WM, if it matters), but even windows
with focus seem essentially frozen to input.  The system-monitor applet
on my panel continues to run normally, and it does NOT show abnormal CPU
usage.

If I continue to click around and mess with windows, eventually even
that will stop working, at which point I often have to hard-power-off.
Unfortunately, with no keyboard I can't ctrl-alt-backspace to kill X,
and if I'm running the Update Manager, an attempt to flick the power
button to start a soft shutdown action results in a denial message:
"Update Manager has stopped the policy action from taking place."

Rarely, and arbitrarily as far as I can tell, the system is responsive
enough that I can start the System Monitor applet and use it to kill the
"gksu" process.  If I can get that far, the system un-freezes, and
normal operation resumes.  Even the escalation to "root" persists --
after killing gksu, I can continue to use Synaptic or whatever I was
planning to do in the first place.

"sudo" from the command line operates normally -- no problems.

This functionality worked OK in Hardy, and this strange behavior began
only after upgrading the distribution to Intrepid.

The foregoing written description is about all I have to offer at this
point.  I would be happy to help debugging this, but I don't know what
other information to provide: running "gksudo" from a terminal window
has the same fault, but offers no debugging output.

-- 
Assistive techologies: password dialogs as normal window + onscreen keyboard
https://bugs.launchpad.net/bugs/314250
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