OpenGL crashes Radeon R7

I have just installed a Sapphire AMD Radeon R7 240 graphics card on my desktop system, which runs OK except that invoking Kinfocenter->Graphical Information->OpenGL appears to crash the graphics driver. The symptom is that the session restarts with a large number (8) of crash warnings reported by Drkonqi, the KDE Crash Handler. None of these error messages seems to be very informative, however here is part of the output of the 1st one: Details: Executable: akonadi_maildispatcher_agent PID: 4234 Signal: Aborted (6) Time: 11/01/14 10:18:16 PM The system is Fedora-20 with all upgrades running on a 4 CPU x86_64 system. The graphics hardware identifies itself as: $ lspci | grep -i vga 01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Oland PRO [Radeon R7 240] The video drivers are: $ lsmod | grep radeon radeon 1415819 3 i2c_algo_bit 13257 1 radeon ttm 80807 1 radeon drm_kms_helper 58041 1 radeon drm 291361 6 ttm,drm_kms_helper,radeon i2c_core 55486 7 drm,i2c_piix4,drm_kms_helper,i2c_algo_bit,v4l2_common,radeon,videodev Before I install the proprietary drivers from AMD, I'd like to see if the open source drivers can be got to work. Any advice is welcome. Thanks