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I've had this problem ever since GNOME shell launched about a year ago. Almost nothing works in overview mode when I have an external monitor connected to my laptop. I can't drag and drop windows. Mouse clicks on the launcher, icons, workspace pager, windows and the notification area are ignored. The notification area has a mind of its own. Popping up when it likes and sometimes never hiding itself. Sometimes clicking on any of the items on the top panel does not work. The only thing that works in overview mode is searching. The biggest usability nightmare is my inability to interact with the notification area. It effectively renders the Shell useless for practical usage. I don't have any of these problems when I disconnect the external monitor. My laptop is a Dell Inspiron 1501 with the following system information. GNOME Version: 3.2.0 Laptop Brand: Dell Inspiron 1501 Memory: 4GB Processor: Dual Core AMD Turion 64 X2 TL-60 Graphics: Gallium 0.4 on ATI RS 480 OS type: 32-bit Disk: 84.8 GM My external monitor is a 19inch Samsung SyncMaster 932b. It's screen is setup to be to the right of the laptop screen. Sadly, every release I check to see if this has been fixed but it hasn't. I can't use GNOME Shell as a result. I'm guessing this is not a known or popular problem, so I'm reporting it.
I am getting the same problem with Fedora 16 - Gnome 3.2. My laptop is an ASUS F5RL with an ATI radeon express X1100 with opensource drivers I guess the problem is the graphic card driver. I already tried to install the propriatary drive, however the last driver version do not support Fedora 16... Without the external monitor connected, gnome 3.2 works perfectly. With an external monitor connected only fallback mode works.
Filed upstream as https://bugzilla.gnome.org/show_bug.cgi?id=667032.
Wondering if this is related to 832820, which I'm still seeing in Fedora 18.
Fedora 16 changed to end-of-life (EOL) status on 2013-02-12. Fedora 16 is no longer maintained, which means that it will not receive any further security or bug fix updates. As a result we are closing this bug. If you can reproduce this bug against a currently maintained version of Fedora please feel free to reopen this bug against that version. Thank you for reporting this bug and we are sorry it could not be fixed.