Just tried to stop Xfbdev and the result is:
1. kill -STOP "pid of Xfbdev" can stop it.
2. My QT/E demo program will show on the screen after executing displayMgrClient. When I executed the demo program from contentlister, there will be a status bar on the lower bottom of screen (the same place of pagebar) showing the progress of execution. The status bar will keep rolling even after Xfbdev stopped.
3. Touch screen still not available. I expected that the cursor will move if I tap the screen with touchpen and do a refresh, but the cursor just didn't move at all.
4. After quitting demo program, kill -CONT "pid of Xfbdev" will restore the Xfbdev process.
So, what am I missing to get tslib working on QT/E?