[Nexus 6P Q&A, Help & Troubleshooting] chichu_9:
Here are all the known issues with Android N

Platform Issues

Performance and battery

System and app performance is known to be periodically slow / janky, and device may become occasionally unresponsive. These problems may become more acute with prolonged use.

Battery life may be regressed in this release for screen-on and screen-off use cases.

Dialer

Dialer app does not support Direct boot. This will be addressed later in N Developer Preview.

Voicemail playback does not work.

System UI

Some new or modified strings in the system UI are not translated to all languages.

Overview UI is still in development, and subject to change. For example, we intend to remove the timer that appears when the user switches between apps.

Settings controls and toggles may be slow or appear to be unresponsive.

Visual design of notifications is subject to change.

In the Gmail app, direct archiving of emails included in a notification bundle does not work properly.

Android for Work

Work Security Challenge

After migration to N, or after the user creates work profiles, work profiles can't create keys in the keystore until the user changes their pattern, PIN, or password, or sets up a Work Challenge.

In Direct boot mode, applying the passcode restrictions to the device causes the work profile to be unlocked, even though the device is locked. This makes the work profile accessible even though it should be protected by the device lock screen.

When the user enters a wrong password and pin, the system does not display any informational message; instead, it only clears the input field. This issue does not affect pattern or fingerprint input.

On a tablet, the background displayed with the work challenge is disproportionately small.

The version of Google Apps Device Policy that is bundled with N Developer Preview does not yet support the Work Profile Security Challenge feature. Developers should instead use TestDPC to test this feature.

Always On VPN

If Always On VPN mode is turned on, but VPN is not available, apps not specified as exceptions to the Always On policy connect over the ordinary network. Unless specified as exceptions to Always On VPN policy, apps should be offline if they have no VPN connection available.

When Always On mode is on, a VPN connection is not established after a device reboots into Direct boot mode, even after the user unlocks the secure lock screen.

Improved Contacts

Bluetooth PBAP/MAP devices do not display Caller ID for work contacts. The next release of Preview resolves this issue.

Work Mode

The Google Now Launcher does not display whether Work Mode is on or off. The Launcher also does not show app suspension state.

After the user turns Work Mode off and on, the system no longer shows Work profile app widgets, such as Calendar.

Suspend Packages

Device admins can suspend critical system packages, which may lead to unexpected behavior, such as placing calls despite the Telephone disabled dialog’s being displayed.

Other

The Settings app crashes on launch if DISALLOW_MOUNT_PHYSICAL_MEDIA is set to true when the user inserts physical media such as an SD card.

The DPM.setPackagesSuspended state does not persist when the user uninstalls and then reinstalls an app. Either the app should remain suspended after uninstall/reinstall, or suspended apps should not be uninstallable

The first check-in in a Work Profile takes several minutes to complete. This may cause the device to take longer than normal to be visible in the Play EMM API.

Notifications from Work Profile apps are not visible to notification listeners installed in the personal profile. As a result, the system does not display Notifications as expected.

The version of Google Apps Device Policy that is bundled with N Developer Preview does not yet support the Work Profile Security Challenge feature. Developers should instead use TestDPC to test this feature.

Keyboard

Bluetooth pairing between keyboards and Android devices may be unstable.

Video

Video playback may lag and show interruptions.

Wi-Fi

Wi-Fi has undergone some refactoring which may change API corner case behavior. Specifically, applications which attempt to connect to specific networks, or attempt to reconnect to networks should retest.

The legacy DHCP client has been removed from the platform. The only DHCP client that the platform supports is the DHCP client introduced in M.

Direct boot

NFC doesn't function until first unlock.

When a phone with Bluetooth enabled is restarted, Bluetooth does not turn on automatically. You must manually re-enable Bluetooth.

Under some circumstances, the default ringtone may not sound for phone calls and messages. This behavior is fixed in the next N Preview release, with one exception (and workaround):

On a device that is not freshly wiped--one that has been booted at least once since being set to direct boot mode--the default notification ringtone does not sound. The user can work around this issue by manually selecting a ringtone from Settings.

Direct boot is not enabled by default on devices running an N Developer Preview build. To enable direct boot for testing and development, go to Developer Options and tap Convert to File Encryption. In this dev preview, this requires a factory reset to repartition and reformat your device for File-based Encryption.

Picture-in-picture for Android TV

The PIP integration in the Recents UI is not finalized, and is subject to change.

The animation of the PIP window is not smooth. Future releases of the Preview will improve this.

Future releases of the Preview will improve upon the visual design and layout alignment of PIP.

Bug reports

Bug reports do not always complete successfully (as a workaround, sometimes they can still be accessed through the bug report document provider in internal storage).

Split-screen Multi-window

Apps may experience crashes and unexpected UI behavior when put into split-screen mode. These are app issues that must be fixed by the app developer.

When an app targets a version of the Android platform earlier than N, the App may not work with split-screen toast may appear multiple times.

Long-pressing the Overview button while using an app with a fixed orientation may produce unexpected app behavior.

Apps may flicker while resizing.

Animations are not yet final.

Input method

Google Keyboard unexpectedly falls back to the generic Google keyboard when Use system language, but Google Keyboard doesn’t support any of the languages selected in the system-language preferences. It should fall back to American English.

You can work around this problem by adding at least one language that Google Keyboard supports.

Accessibility

TalkBack exhibits issues with features including Notifications, Quick Settings Tiles and Multi-window display that may cause system crashing or lack of spoken feedback from TalkBack. Future releases of the preview will address these issues.