[G2 Q&A, Help & Troubleshooting] MarkusMcNugen:
Heres a collection of issues people have had and the ways I've seen to fix them so far. This is just what I've gathered from the CM12 and Liquid Smooth threads.

Lost Internal SDcard Access?

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Enable USB Debugging and use ADB to issue these commands:

adb shell
su
restorecon –FR /data/media/0

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Or run these commands from terminal emulator:

su
restorecon –FR /data/media/0

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Or install and run LG CM12 Storage Fixer from here (Thanks to -viperboy-):

http://xdaforums.com/showpost.php?p=56956094&postcount=1774

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(Alternatively, you can download a flashable zip that installs LG CM12 Storage Fixer here)

https://www.mediafire.com/?3nqc51za6y1phof

All my SDcard contents are in folder 0…?

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Manually move the contects of /sdcard/0/ to /sdcard/ in a file manager

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Or run this command from terminal emulator:

mv /sdcard/0/* /sdcard/

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Or flash the zip from somboons post directly below this one.

Knock On/Double Tap 2 Wake (DT2W) not working?

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Try running this command from terminal emulator

echo "1" > /sys/devices/virtual/input/lge_touch/touch_gesture

and/or

echo "1" > /sys/devices/virtual/input/lge_touch/firmware

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Need the init.d script for DT2W?

http://xdaforums.com/lg-g2/developm...v4-0-lg-g2-t2948395/post56951929#post56951929

(If this zip doesn't work and you have DT2W enabled in settings, init.d may be broken on your ROM build. Download Universal Init.d from the playstore, enable it, and reboot and it should work. Otherwise see next method.)

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Or install Device Control from the playstore here:

https://play.google.com/store/apps/details?id=org.namelessrom.devicecontrol

(Features > Knock on) App has other useful features as well!

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Or you can flash Render Kernel for Lollipop (Make sure your variant is supported)

http://xdaforums.com/lg-g2/development/kernel-render-kernel-aosp-lg-roms-t2803929

WiFi tethering not working?

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Possible fix, Enter this command into terminal (Thanks to genesixxbf3 for the fix and fma965 for the easy command):

settings put global tether_dun_required 0

Roaming bug while on LS980 or VS980 variants?

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Try the following:

Open the dialer and dial *#*#4636#*#* and select "Phone Information" on the menu that pops up. Press the 3 dots menu button. Select "Select radio band". Then select the US band.

(May have to be reapplied after every reboot)

Device not entering deep sleep?

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Check your devices logcat for

"E: qcom_sensors_hal: Error reading SLOW_TIMER (fd=-1) Bad file number"

If visible in your logcat, try what this post says:

http://xdaforums.com/showpost.php?p=57148400&postcount=3148

(Download and use an app from the playstore such as Build Prop Editor, or edit the build.prop with a file manager.)

Gesture/Swipe typing not working on keyboard?

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Use google keyboard from the play store

Contacts Force Closing When Editing Contact?

(Unfortunately these are not guaranteed fixes. Always backup the original APKs first!)

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Follow the instructions in this post:

http://xdaforums.com/showpost.php?p=57000972&postcount=289

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Or try the apk + instructions in this post:

http://xdaforums.com/showthread.php?p=57002358

Netflix issues?

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Try flashing the zip from this post:

http://xdaforums.com/showthread.php?p=57001344

Miracast Fix/Possible Chromecast Fix:

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Follow the instructions in this post

http://xdaforums.com/showpost.php?p=57103874&postcount=2878

Viper4Android issues?

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The following post has all the information you need to know. If you still can't get it to work after troubleshooting (LS users), try flashing the LolliViPER zip attached to the post:

http://xdaforums.com/showpost.php?p=47858556&postcount=1

I've confirmed it works with Play Music with the following settings: SELinux Permissive, Compatibility mode turned on in V4A, and Use NuPlayer turned off in developer options.

NFC Force Closing at Boot?

Reboot into recovery

Enter file manager

Navigate to /system/app/nfc

Delete the whole nfc folder