[OnePlus 2 Q&A, Help & Troubleshooting] vonotny:
Apparently these is no such thread in this forum yet, so here we go. I've encountered a number of annoying bugs in my OPT running OOS 2.1.2, so let's collect them all here and maybe OnePlus listens and fixes them :)

EDIT: Also, this can be seen as a repository for new OPT users encountering the same issues.

UPDATE 12/25/2015: The thread now collects the bugs encountered in the latest OOS 2.2.0. First, below are confirmed bugs. Then follow unconfirmed and/or old bugs from 2.1.2 which have yet to be confirmed in OOS 2.2.0. (If they cannot be confirmed, this means they have been fixed :) )

UPDATE 3/7/2015: Thread now updated for OOS 2.2.1.

Confirmed OOS 2.2.1 bugs

- No sound confirmation on ringtone volume change: the "ding" sound that should be played back at each step when the ringtone volume is changed only occurs sometimes / confirmation sound is missing most of the time -> not possible to check immediately whether the ringtone volume setting is high/low enough EDIT: This appears to be an issue with GravityBox and the extended volume options setting, at least partially.

- In-call volume stuck when phone is at the ear and display is off / volume rocker sometimes changes ringtone/alarm/media volume instead of call volume (however, this behaviour is highly inconsistent, I can't recreate it every time) / works when phone is away from ear and display is on. EDIT: This might in fact be related to the same GravityBox setting. Still, it's a bug in OOS since GravityBox doesn't cause this behaviour in other phones/systems.

- Wrong display of carrier name after soft reboot

- WiFi shown as constantly active in battery overview, even though it was deactivated all or most of the time / switching it on and off again is no remedy (-> possible fix is to charge the phone)

- Bluetooth communication with car infotainment systems broken: Many users report that the Bluetooth connection with their car's infotainment system doesn't work properly. Either the connection drops, or contacts don't sync, or music isn't played back correctly, or any combination of these.

- Camera crashes when capturing RAW images: When the setting for shooting RAW images is activated, the camera freezes after taking a picture and then force-closes. The DNG file also appears to be corrupted resp. cannot be processed by image editing apps such as Snapseed.

Unconfirmed OOS 2.2.1 bugs, confirmed for OOS 2.2.0

- Wrong display of carrier name when using two SIM cards: some users report that when using 2 SIMs, one of the carrier names isn't displayed correctly

- Inconsistent battery percentage display: percentage stays at same level for hours, then suddenly drops by double digit percentage / often heavy drops after a reboot, sometimes up to 10%

- On-screen home button doesn't work immediately after unlocking the phone with the fingerprint sensor. For some users, a second press on the on-screen home button is necessary in this case in order to get to the home screen. Apparently doesn't happen when unlocking with pattern/pin/etc.

- Incoming SMS not assigned to proper thread in Messenger app: Some users report that incoming SMS aren't filed in the proper messaging thread for the contact they came from, but are shown seperately in the Messenger app. Archiving and restoring all SMS seems to correct this behaviour, but only for old messages and not for new incoming messages. It appears this happens only to users with 2 active SIM cards. (PLEASE CONFIRM)

- Gestures not working properly: Some users report the "O" gesture for the camera doesn't work, and some users report that the gestures for music playback only work when the music app is active.

Bugs present in earlier OOS versions, unconfirmed for OOS 2.2.1

- Notification sound played back incompletely: Some users report that notifications sounds are sometimes played back incompletely, starting around half their duration; e.g. instead of "DING" there is only an "ING". This behaviour, again, seems inconsistent.

- Apps crashing randomly: Some users report that since the OOS 2.1.2 update, some of their apps are crashing randomly, making the phone practically unusable

- Capactive button backlight stays on after screen is turned off: this occasionally happens to some users -> can cause additional battery drain when not detected / remedy: turn the screen back on and off again, this usually helps

Potential OS bugs, but possibly related to other issues:

- LTE connection is lost, drops to 3G, only comes back after manual switch to 3G and then to LTE again (one user report from France, OPT A2001 on Free Mobile)

Please leave the bugs you encounter in your comments, and I will add them to this list. Also, please help confirm which bugs are still present in OOS 2.2.1 and which have been fixed.

An even more concise list of bugs in OOS 2.1.2 can be found over at the OnePlus forums, though some of the bugs mentioned here aren't mentioned there.

https://forums.oneplus.net/threads/bug-list-oxygenos-2-1-2-op2.408428/