Created attachment 841272 [details] kernel panic picture Description of problem: I use lenovo Y460 notebook which has two vga-card: Intel intergrated card AMD Radeon hd5650m lspci -vv | grep -i 'VGA compatible controller' 00:02.0 VGA compatible controller: Intel Corporation Core Processor Integrated Graphics Controller (rev 18) (prog-if 00 [VGA controller]) 01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Madison [Mobility Radeon HD 5650/5750 / 6530M/6550M] (rev ff) (prog-if ff) Version-Release number of selected component (if applicable): Fedora 20 Linux 3.12.5-302.fc20.x86_64 How reproducible: Steps to Reproduce: 1.Install feodra 20 and upgrade kernel to 3.12.5 in Lenovo Y460 or maybe some other pc has two vga-cards. 2.Login in then echo OFF > /sys/kernel/debug/vgaswitcheroo/switch 3.wait seconds... Actual results: Kernel panic Expected results: Kernel panic Additional info:
*********** MASS BUG UPDATE ************** We apologize for the inconvenience. There is a large number of bugs to go through and several of them have gone stale. Due to this, we are doing a mass bug update across all of the Fedora 20 kernel bugs. Fedora 20 has now been rebased to 3.13.4-200.fc20. Please test this kernel update and let us know if you issue has been resolved or if it is still present with the newer kernel. If you experience different issues, please open a new bug report for those.
*********** MASS BUG UPDATE ************** This bug has been in a needinfo state for several weeks and is being closed with insufficient data due to inactivity. If this is still an issue with Fedora 20, please feel free to reopen the bug and provide the additional information requested.