[Technology] Fedora 18 Beta, FedUp, and GNOME Shell's excessive CPU usage

Summary:  updating to F18 caused GNOME Shell to take up too much CPU; this was because I ran fedup upgrading to F18 beta from F17, and the some of the packages at the time the F18 beta was set have versions below F17 currently, so F17 packages were kept, like my Xorg intel driver, which could no longer load in F18, and consequently GNOME Shell was using llvmpipe and running on the CPU and not the GPU.  Solution was to run yum distro-sync

Fedora 18 has been delayed by almost two months.  They delayed it by another week until next week, but I am fed up!, so I used FedUp to update it to Fedora 18's current pre-release status.  Mwahaha.

After doing so, I noticed my computer running quite hot, and that gnome-shell is consuming all available CPU.  Why?

Poking around, I noticed that yum says stuff like:

ibus- has missing requires of libdconf.so.0()(64bit)
ibus- has missing requires of libgnomekbd.so.7()(64bit)
ibus- has missing requires of libgnomekbdui.so.7()(64bit)
libpinyin-0.8.0-2.fc17.x86_64 has missing requires of libdb-5.2.so()(64bit)
xorg-x11-drv-intel-2.20.16-1.fc17.x86_64 has missing requires of libudev.so.0()(64bit)
xorg-x11-drv-intel-2.20.16-1.fc17.x86_64 has missing requires of xserver-abi(videodrv-12) >= ('0', '1', None)

Uh oh, isn't that my video card driver?  Reading bug 812624 about GNOME Shell and high CPU usage also suggested that it might be being rendered via llvmpipe, on the CPU, rather than by my video card.  A quick check confirms it:

# glxinfo | grep renderer
OpenGL renderer string: Gallium 0.4 on llvmpipe (LLVM 0x301)

Uh oh.

I checked /var/log/Xorg.0.log to confirm the suspicion that the intel driver wasn't loading, and as expected,

Failed to load /usr/lib64/xorg/modules/drivers/intel_drv.so: libudev.so.0: cannot open shared object file: No such file or directory

Trying to do a yum whatprovides **/libudev.so.0 unfortunately turned up nothing, but googling the error gave me bug 888085.  There contained was the obvious tip of using yum distro-sync to make sure I have Fedora 18's packages and not some old ones from Fedora 17.  Sheesh.

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