a personal storage for things I need to remember
On my Fedora box I experienced some crackling sound / distortion when playing games. All other applications seemed to work fine. The following tip by heftig helped:
Try adding tsched=0 to the load-module module-udev-detect line in /etc/pulse/default.pa so it reads:
load-module module-udev-detect tsched=0
After rebooting the problem was gone.
I recently upgraded my Fedora 20 with the latest kernel and came across an issue when I wanted to boot my Windows VM. VirtualBox told me to setup vboxdrv again, which refused to work, stopping the the error message:
DKMS: add completed. Failed to install using DKMS, attempting to install without Makefile:183: * Error: unable to find the sources of your current Linux kernel. Specify KERN_DIR=<directory> and run Make again. Stop.</directory>
The only thing that helped was to remove VirtualBox altogether.
yum remove VirtualBox-4.3
And then reinstall it from rpmfusion with the kmod meta-package which install VirtualBox alongside the correct kernel sources.
yum install VirtualBox kmod-VirtualBox
After installing the VirtualBox extensions I was able to bring my Windows VM back up.
via: https://ask.fedoraproject.org/en/question/40926/trying-to-install-virtualbox-or-vmware-fedora-20/