iceweasel locking up under KDE, fine under Xfce

[Arthur Marsh <arthur.marsh@internode.on.net>]

For the second time I'm seeing this bug:

http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=804060

some upgrade in the last few days did it, my local Debian mirror wasn't 
updating and when I switched to an alternative had over 100 packages to 
update.

The problem could be related to using a Radeon3200HD onboard graphics 
chip / vdpau.

I'll try removing vdpau libraries and downgrading likely libraries and 
am open to other suggesitons to try to isolate the cause.

The only error I get in dmesg is:

[  308.499736] kactivitymanage[4194]: segfault at 7f7a85b35cd0 ip 
000000302bc14291 sp 00007ffce281db78 error 4 in 
libQt5Sql.so.5.5.1[302bc00000+3f000]
[ 1088.569088] kactivitymanage[4828]: segfault at 7fdfc616ecd0 ip 
000000302bc14291 sp 00007fff3a3658d8 error 4 in 
libQt5Sql.so.5.5.1[302bc00000+3f000]

Arthur.