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Genymobile / scrcpy

Display and control your Android device
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Turn screen off disabling screen turn off after disconnect #1605

Open ulno opened 4 years ago

ulno commented 4 years ago

Environment

Describe the bug I am building a small open source convergence solution using my phone as communication hub (like Franz or Rambox) getting notifications via kdeconnect and then answering and viewing messages on a phone sitting on the top of my screen. Using --turn-screen-off works sometimes, sometimes it only turns the screen black and keeps the backlight on - it does always still show the desktop. I see the same behavior using ctrl-o and (even when using ctrl-shift-o before disconnecting). When I disconnect the phone or terminate scrcpy it breaks the capability of my phone to ever switch off the display again (using only ctrl-o and not --turn-screen-off) until I reboot the phone - I wonder if #1143 is related.

Can I see somewhere what exactly is done to switch off the screen (eventually as shell commands run via adb, but I assume it's somehow done in scrcpy-server), so I can debug things more step by step? My system also uses a clean-up hook - so, I could do some resetting if I knew what was happening. However, I would actually even like to make sure that turning the screen off works all the time.

On errors, please provide the output of the console (and adb logcat if relevant). console: [server] INFO: Device screen turned off (at start)

I am actually not sure what I should provide here best as phone starts misbehaving after disconnect. When the error occurred (did not switch off even before), I managed to capture the attached logcat.txt log when just terminating scrcpy. Screen cannot turn off now anymore. Scrcpy was stated this way: scrcpy -m 1920 -w --turn-screen-off

logcat output is too long, can't upload - here is it in my drive: https://drive.google.com/file/d/1dRZt1_T0Yd1H3izHs9I9m2t-onD363-O/view

rom1v commented 4 years ago

When I disconnect the phone or terminate scrcpy it breaks the capability of my phone to ever switch off the display again

Actually, pressing POWER once should turn it off, pressing POWER again should turn it on, screen included.

Anyway, it's implemented and merged in dev: #1572 #1576

ulno commented 4 years ago

I haven't had the chance yet to compile the new version, I will test tomorrow.

However, I am not sure that the two issues cover really the same problem I have here: after disconnecting, my screen does turn on pressing the power button, and then I can operate the phone normally. When pressing power again or waiting a couple of seconds, the screen turns black but the screen doesn't turn off anymore - the backlight is still onandn the phone starts heating up notably in my pocket. So, yes something turns off (screen goes black), but backlight/the physical screen is not turned off anymore.

rom1v commented 4 years ago

OK, looks like a problem in the device ROM then. Scrcpy just requests the device to set the power mode, the way the device handles it is not defined by scrcpy.

There were also similar bugs with turning the screen on some time ago, see discussion: https://github.com/Genymobile/scrcpy/issues/175#issuecomment-497946596

ulno commented 4 years ago

Compiled scrcpy from master, same problems persist. I see at least some pattern: After reboot it usually works once. So after running scrcpy with --turn-off-screen and then closing scrcpy gracefully (or even when just disconnecting), the display still DOES turn off. running scrcpy with --turn-off-screen a second time though usually destroys the display turning off (it still turns black) and destroys the working of the brightness settings as in #1143. These two problems always happen together.

I can still use adb shell settings put system screen_brightness xxx to move the brightness slider, but actual brightness settings are ignored.

As it works the first time though, I wonder if we could find some kind of cleanup that can put the phone in a normal state even when running scrcpy twice. I wonder if it is some kind of timing issue?

I am trying to find something suspicious in the log, but I can't find anything, I think this is the relevant part when turning the screen off, but only reaching black state with display light set to full: Some lines that I think sound suspicious from below full log

07-20 09:45:32.676  2121  2251 D SurfaceControl: Excessive delay in setPowerMode()
07-20 09:45:32.677   428   454 I vendor.mediatek.hardware.power@2.0-impl: setInteractive Disable All 13 1281
07-20 09:45:32.679  1868  1895 E         : flp_screen_monitor_thread: Screen off
07-20 09:45:32.680  1868  1901 D         : mnld_main_thread: flp2mnl_hdlr msg
07-20 09:45:32.681  1868  1901 D flpint  : mtk_flp2mnl_process: mtk_flp2mnl_process, recv prmsg, type:502, len:1 status:2
07-20 09:45:32.681  1868  1901 D flpint  : mtk_flp2mnl_process: free screen dbg
07-20 09:45:32.681  1868  1901 D         : mnld_main_thread: gfc2mnl_hdlr msg
07-20 09:45:32.681  1868  1901 D         : mtk_gfc_ofl2mnl_process: free screen dbg
07-20 09:45:32.682  2283  2283 D StatusBarKeyguardViewManager: reset() is called, mShowing = true ,mOccluded = falsehideBouncerWhenShowing = true
07-20 09:45:32.691  2121  2217 E WifiVendorHal: getWifiLinkLayerStats(l.937) failed {.code = ERROR_NOT_SUPPORTED, .description = }
07-20 09:45:32.710  2264  2264 W SessionManager: SessionManager.beginSession():53 Try to begin an already begun session [INPUT_SESSION], end it first
07-20 09:45:32.832  3084  3084 D NfcService: BroadcastReceiver - SCREEN_STATE_OFF_LOCKED
07-20 09:45:32.833  3084  3084 D NfcService: NfcServiceHandler - handleMessage(MSG_APPLY_SCREEN_STATE)
07-20 09:45:32.833   416   416 D StNfcHal: HAL st21nfc: StNfc_hal_write
07-20 09:45:32.833   416  3750 D StNfcHal: Tx 20 09 01 03 
07-20 09:45:32.834   416  3751 W StNfcHal: ! i2cWrite!!, errno is 'I/O error'

Anything weird up there? I just wonder what this excessive delay is.

Full log:

07-20 09:45:32.384  1917  1917 I Light   : enable: handle:4, en:0 
07-20 09:45:32.384  2283  2283 V HeadsUpManager: releaseAllImmediately
07-20 09:45:32.385   434   434 D SurfaceFlinger: Set power mode=0, type=0 flinger=0x6f9d255000
07-20 09:45:32.385  2121  2144 I DisplayManagerService: Display device changed state: "Built-in Screen", OFF
07-20 09:45:32.386   410 14713 I hwcomposer: [HWC] Display(0) SetPowerMode(0)  
07-20 09:45:32.387  2283  2283 D KeyguardSecurityModel: isPinPukOrMeRequiredOfSubId() - phoneId = 0, simState = ABSENT
07-20 09:45:32.387  2283  2283 D KeyguardSecurityModel: isPinPukOrMeRequiredOfSubId() - phoneId = 1, simState = READY
07-20 09:45:32.387  2283  2283 D AntiTheftManager: getCurrentAntiTheftMode() is called.
07-20 09:45:32.389  2283  2283 D KeyguardSecurityModel: isPinPukOrMeRequiredOfSubId() - phoneId = 0, simState = ABSENT
07-20 09:45:32.389  2283  2283 D KeyguardSecurityModel: isPinPukOrMeRequiredOfSubId() - phoneId = 1, simState = READY
07-20 09:45:32.389  2283  2283 D AntiTheftManager: getCurrentAntiTheftMode() is called.
07-20 09:45:32.392  2283  2283 D StatusBar: disable<e i a s b H R c s > disable2<q i n >
07-20 09:45:32.392  2283  2283 D StatusBar: disable<e i a s b H R c s > disable2<q i n >
07-20 09:45:32.393  2121  2206 I InputReader: Reconfiguring input devices.  changes=0x00000004
07-20 09:45:32.605  1654  1654 D GED Service: signo=49, event_notify=00000000
07-20 09:45:32.606  1933  2008 I  1933  2008 [sunwave-ca-device] : (730) uevent: got screen OFF event.'SCREEN_STATUS=OFF'.
07-20 09:45:32.606  1933  2148 I  1933  2148 [sunwave-hal] : (797) 'screenOnOffMonitoringThread' screen_on = 0
07-20 09:45:32.676   434   434 D SurfaceFlinger: Finished set power mode=0, type=0
07-20 09:45:32.676  2121  2251 D SurfaceControl: Excessive delay in setPowerMode()
07-20 09:45:32.677   428   454 I vendor.mediatek.hardware.power@2.0-impl: setInteractive Disable All 13 1281
07-20 09:45:32.679  1868  1895 E         : flp_screen_monitor_thread: Screen off
07-20 09:45:32.680  1868  1901 D         : mnld_main_thread: flp2mnl_hdlr msg
07-20 09:45:32.681  1868  1901 D flpint  : mtk_flp2mnl_process: mtk_flp2mnl_process, recv prmsg, type:502, len:1 status:2
07-20 09:45:32.681  1868  1901 D flpint  : mtk_flp2mnl_process: free screen dbg
07-20 09:45:32.681  1868  1901 D         : mnld_main_thread: gfc2mnl_hdlr msg
07-20 09:45:32.681  1868  1901 D         : mtk_gfc_ofl2mnl_process: free screen dbg
07-20 09:45:32.682  2283  2283 D StatusBarKeyguardViewManager: reset() is called, mShowing = true ,mOccluded = falsehideBouncerWhenShowing = true
07-20 09:45:32.682  2283  2283 D StatusBarKeyguardViewManager: showBouncerOrKeyguard() is called.
07-20 09:45:32.683  2283  2283 D KeyguardSecurityModel: isPinPukOrMeRequiredOfSubId() - phoneId = 0, simState = ABSENT
07-20 09:45:32.683  2283  2283 D KeyguardSecurityModel: isPinPukOrMeRequiredOfSubId() - phoneId = 1, simState = READY
07-20 09:45:32.683  2283  2283 D AntiTheftManager: getCurrentAntiTheftMode() is called.
07-20 09:45:32.684  2283  2283 D StatusBarKeyguardViewManager: needsFullscreenBouncer() is false,show "Notification Keyguard" view.
07-20 09:45:32.685  2283  2283 V HeadsUpManager: releaseAllImmediately
07-20 09:45:32.691  2121  2217 E WifiVendorHal: getWifiLinkLayerStats(l.937) failed {.code = ERROR_NOT_SUPPORTED, .description = }
07-20 09:45:32.692  2283  2283 D KeyguardSecurityModel: isPinPukOrMeRequiredOfSubId() - phoneId = 0, simState = ABSENT
07-20 09:45:32.692  2283  2283 D KeyguardSecurityModel: isPinPukOrMeRequiredOfSubId() - phoneId = 1, simState = READY
07-20 09:45:32.692  2283  2283 D AntiTheftManager: getCurrentAntiTheftMode() is called.
07-20 09:45:32.693  2121  2217 D WifiConnectivityManager: handleScreenStateChanged: screenOn=false
07-20 09:45:32.693  2121  2217 D WifiConnectivityManager: startConnectivityScan: screenOn=false wifiState=connected scanImmediately=false wifiEnabled=true wifiConnectivityManagerEnabled=true
07-20 09:45:32.698  2283  2283 D KeyguardSecurityModel: isPinPukOrMeRequiredOfSubId() - phoneId = 0, simState = ABSENT
07-20 09:45:32.698  2283  2283 D KeyguardSecurityModel: isPinPukOrMeRequiredOfSubId() - phoneId = 1, simState = READY
07-20 09:45:32.698  2283  2283 D AntiTheftManager: getCurrentAntiTheftMode() is called.
07-20 09:45:32.701  2283  2283 D StatusBar: disable<e i a s b H R c s > disable2<q i n >
07-20 09:45:32.703  2283  2283 D FaceUnlockUtil: showUnLockScreenAgain mFaceUnlockStatus = 17 unlockingAllowed = true
07-20 09:45:32.702  2283  2283 D StatusBar: disable<e i a s b H R c s > disable2<q i n >
07-20 09:45:32.705  2392  2392 I wpa_supplicant: wpa_driver_nl80211_driver_cmd: wlan0 recv cmd SETSUSPENDMODE 1
07-20 09:45:32.709  2264  2264 I GoogleInputMethodService: GoogleInputMethodService.onStartInput():1808 
07-20 09:45:32.710  2264  2264 W SessionManager: SessionManager.beginSession():53 Try to begin an already begun session [INPUT_SESSION], end it first
07-20 09:45:32.711  2392  2392 I wpa_supplicant: wpa_driver_nl80211_driver_cmd: ret = 0 used = 17 total = 512
07-20 09:45:32.713  2283  2283 D KeyguardSecurityModel: isPinPukOrMeRequiredOfSubId() - phoneId = 0, simState = ABSENT
07-20 09:45:32.713  2283  2283 D KeyguardSecurityModel: isPinPukOrMeRequiredOfSubId() - phoneId = 1, simState = READY
07-20 09:45:32.713  2283  2283 D AntiTheftManager: getCurrentAntiTheftMode() is called.
07-20 09:45:32.717  2264  2264 I GoogleInputMethodService: GoogleInputMethodService.onStartInputView():1924 
07-20 09:45:32.725  2283  2283 D KeyguardSecurityModel: isPinPukOrMeRequiredOfSubId() - phoneId = 0, simState = ABSENT
07-20 09:45:32.725  2283  2283 D KeyguardSecurityModel: isPinPukOrMeRequiredOfSubId() - phoneId = 1, simState = READY
07-20 09:45:32.725  2283  2283 D AntiTheftManager: getCurrentAntiTheftMode() is called.
07-20 09:45:32.727  2283  2283 V KeyguardSecurityView: showPrimarySecurityScreen(securityMode=Password)
07-20 09:45:32.732  2283  2283 V HeadsUpManager: releaseAllImmediately
07-20 09:45:32.736  2283  2283 D KeyguardSecurityModel: isPinPukOrMeRequiredOfSubId() - phoneId = 0, simState = ABSENT
07-20 09:45:32.736  2283  2283 D KeyguardSecurityModel: isPinPukOrMeRequiredOfSubId() - phoneId = 1, simState = READY
07-20 09:45:32.736  2283  2283 D AntiTheftManager: getCurrentAntiTheftMode() is called.
07-20 09:45:32.738  2283  2283 D KeyguardSecurityModel: isPinPukOrMeRequiredOfSubId() - phoneId = 0, simState = ABSENT
07-20 09:45:32.738  2283  2283 D KeyguardSecurityModel: isPinPukOrMeRequiredOfSubId() - phoneId = 1, simState = READY
07-20 09:45:32.738  2283  2283 D AntiTheftManager: getCurrentAntiTheftMode() is called.
07-20 09:45:32.740  2283  2283 D StatusBar: disable<e i a s b H R c s > disable2<q i n >
07-20 09:45:32.725  2283  2283 D FaceUnlockUtil: showUnLockScreenAgain mFaceUnlockStatus = 17 unlockingAllowed = true
07-20 09:45:32.741  2283  2283 D FaceUnlockUtil: updateMsgIcon message = 
07-20 09:45:32.740  2283  2283 D StatusBar: disable<e i a s b H R c s > disable2<q i n >
07-20 09:45:32.746  2283  2283 I vol.Events: writeEvent dismiss_dialog screen_off
07-20 09:45:32.746  2283  2283 W IInputConnectionWrapper: getTextBeforeCursor on inactive InputConnection
07-20 09:45:32.747  2283  2283 W IInputConnectionWrapper: getSelectedText on inactive InputConnection
07-20 09:45:32.748  2283  2283 W IInputConnectionWrapper: getTextAfterCursor on inactive InputConnection
07-20 09:45:32.749  2264  2264 I KeyboardViewUtil: KeyboardViewUtil.getKeyboardHeightRatio():182 systemKeyboardHeightRatio:1.000000; userKeyboardHeightRatio:1.050000.
07-20 09:45:32.750  2264  2264 I AndroidIME: AbstractIme.onActivate():84 PasswordIme.onActivate() : EditorInfo = Package = com.android.systemui : Type = Password : Learning = Disable : Suggestion = Hide : AutoCorrection = Disable : Microphone = Hide : NoPersonalizedLearning = Disable : AutoStartVoiceInput = Disable, IncognitoMode = false
07-20 09:45:32.751  2264  2264 E putmethod.lati: Invalid ID 0x00000000.
07-20 09:45:32.751  2264  2264 E putmethod.lati: Invalid ID 0x00000000.
07-20 09:45:32.752  2264  2264 W Keyboard: Keyboard.getKeyboardViewHelper():613 null helper is returned: keyboardDef=ktu{className=.latin.keyboard.LatinPasswordKeyboard, id=keyboard_password, initialStates=0, keyboardViewDefs=[kus{direction=null, id=default_keyboard_view, isScalable=true, layoutId=keyboard_latin_10_10_9_9_body, type=BODY, touchable=true}, kus{direction=null, id=default_keyboard_view, isScalable=false, layoutId=keyboard_inline_suggestion, type=FLOATING_CANDIDATES, touchable=false}], keyTextSizeRatio=1.0, persistentStates=0, persistentStatesPrefKey=null, popupBubbleLayoutId=popup_bubble_material, recentKeyLayoutId=#0x0, recentKeyPopupLayoutId=#0x0, recentKeyType=null, rememberRecentKey=NONE, sessionStates=3, stringId=keyboard_en}, type=HEADER, helpersCreated=[null, eeg@5582808, eeg@ebaba1], 
07-20 09:45:32.755  2264  2264 E putmethod.lati: Invalid ID 0x00000000.
07-20 09:45:32.755  2264  2264 E putmethod.lati: Invalid ID 0x00000000.
07-20 09:45:32.756  2264  2264 W Keyboard: Keyboard.getKeyboardViewHelper():613 null helper is returned: keyboardDef=ktu{className=.latin.keyboard.LatinPasswordKeyboard, id=keyboard_password, initialStates=0, keyboardViewDefs=[kus{direction=null, id=default_keyboard_view, isScalable=true, layoutId=keyboard_latin_10_10_9_9_body, type=BODY, touchable=true}, kus{direction=null, id=default_keyboard_view, isScalable=false, layoutId=keyboard_inline_suggestion, type=FLOATING_CANDIDATES, touchable=false}], keyTextSizeRatio=1.0, persistentStates=0, persistentStatesPrefKey=null, popupBubbleLayoutId=popup_bubble_material, recentKeyLayoutId=#0x0, recentKeyPopupLayoutId=#0x0, recentKeyType=null, rememberRecentKey=NONE, sessionStates=3, stringId=keyboard_en}, type=HEADER, helpersCreated=[null, eeg@5582808, eeg@ebaba1], 
07-20 09:45:32.757  2264  2264 W KeyboardModeManager: KeyboardModeManager.setInputView():302 setInputView() : inputView = com.google.android.apps.inputmethod.libs.framework.core.InputView{1ccf7cd V.E...... .......D 0,0-1080,2106}
07-20 09:45:32.758  2264  2264 I ConversationToQueryExtension: ConversationToQueryExtension.isEnabledForHostApp():254 Conv2Query not enabled due to current app [com.android.systemui] not in whitelist
07-20 09:45:32.758  2264  2264 I ConversationToQueryExtension: ConversationToQueryExtension.onActivate():164 onActivate() : Disabled by unsupported host app
07-20 09:45:32.759  2264  2264 I CurrentMicStatusHolder: CurrentMicStatusHolder.onStartInputView():79 Current Mic status = {MicIconHidden-PasswordOrNumberOrDateInputType,}
07-20 09:45:32.759  2264 16619 I FederatedC2QExtension: FederatedC2QExtension.setupModelDownloading():391 Already registered manifest.
07-20 09:45:32.759  2264  2264 I VoiceImeExtension: VoiceImeExtension.shouldStartVoiceInputAutomatically():343 No private IME option set to start voice input.
07-20 09:45:32.761  2264  2264 V PhoneWindow: DecorView setVisiblity: visibility = 0, Parent = android.view.ViewRootImpl@9e979fa, this = DecorView@cef4bab[InputMethod]
07-20 09:45:32.761  2283  2283 D sunjin  : [NavigationBarView]updateNavButtonIcons: mVertical - false
07-20 09:45:32.762  2264  2264 I GoogleInputMethodService: GoogleInputMethodService.onFinishInputView():2135 
07-20 09:45:32.762  2264  2264 I AndroidIME: AbstractIme.onDeactivate():161 PasswordIme.onDeactivate()
07-20 09:45:32.764  2264  2264 V PhoneWindow: DecorView setVisiblity: visibility = 8, Parent = android.view.ViewRootImpl@9e979fa, this = DecorView@cef4bab[InputMethod]
07-20 09:45:32.770  2283  2283 D sunjin  : [NavigationBarView]updateNavButtonIcons: mVertical - false
07-20 09:45:32.773  2264  2264 E putmethod.lati: Invalid ID 0x00000000.
07-20 09:45:32.774  2264  2264 E putmethod.lati: Invalid ID 0x00000000.
07-20 09:45:32.774  2264  2264 W Keyboard: Keyboard.getKeyboardViewHelper():613 null helper is returned: keyboardDef=ktu{className=.latin.keyboard.LatinPasswordKeyboard, id=keyboard_password, initialStates=0, keyboardViewDefs=[kus{direction=null, id=default_keyboard_view, isScalable=true, layoutId=keyboard_latin_10_10_9_9_body, type=BODY, touchable=true}, kus{direction=null, id=default_keyboard_view, isScalable=false, layoutId=keyboard_inline_suggestion, type=FLOATING_CANDIDATES, touchable=false}], keyTextSizeRatio=1.0, persistentStates=0, persistentStatesPrefKey=null, popupBubbleLayoutId=popup_bubble_material, recentKeyLayoutId=#0x0, recentKeyPopupLayoutId=#0x0, recentKeyType=null, rememberRecentKey=NONE, sessionStates=3, stringId=keyboard_en}, type=HEADER, helpersCreated=[null, eeg@5582808, eeg@ebaba1], 
07-20 09:45:32.776  2264  2264 I DeviceStatusMonitor: DeviceStatusMonitor$1.onReceive():51 onReceive() : Action = android.intent.action.SCREEN_OFF
07-20 09:45:32.776  2264  2264 I InputBundle: InputBundle.consumeEvent():956 Skip consuming an event as imeStatus is 0
07-20 09:45:32.777  2264  2264 I DeviceStatusMonitor: DeviceStatusMonitor.updateCountryInfo():111 updateCountryInfo(), notifyAnyway = false
07-20 09:45:32.794  3281  3281 I PublicSearchService: Creating pss binder().
07-20 09:45:32.797  3281  3300 I PublicSearchService: Calling beginBinderSession().
07-20 09:45:32.797  3281  3300 I PublicSearchService: beginBinderSession(): calling binder
07-20 09:45:32.798  3281  3300 V AIEngines: #process
07-20 09:45:32.798  3281  4384 V AIEngines: #processSync
07-20 09:45:32.799  3281  4384 V AIEngines: #process: skip check - hasSuggestion? false, selectedengines []
07-20 09:45:32.799  3281  4384 V AIEngines: #process: done
07-20 09:45:32.826  2283  2283 D sunjin  : [NavigationBarView]updateNavButtonIcons: mVertical - false
07-20 09:45:32.832  3084  3084 D NfcService: BroadcastReceiver - SCREEN_STATE_OFF_LOCKED
07-20 09:45:32.833  3084  3084 D NfcService: NfcServiceHandler - handleMessage(MSG_APPLY_SCREEN_STATE)
07-20 09:45:32.833   416   416 D StNfcHal: HAL st21nfc: StNfc_hal_write
07-20 09:45:32.833   416  3750 D StNfcHal: Tx 20 09 01 03 
07-20 09:45:32.834   416  3751 W StNfcHal: ! i2cWrite!!, errno is 'I/O error'
07-20 09:45:32.839   416  3751 D StNfcHal: Rx 40 09 01 00 
07-20 09:45:32.840   416   416 D StNfcHal: HAL st21nfc: StNfc_hal_write
07-20 09:45:32.840   416  3750 D StNfcHal: Tx 20 02 04 01 02 01 00 
07-20 09:45:32.841   416  3751 D StNfcHal: Rx 40 02 02 00 00 
07-20 09:45:32.863  3056  3056 E HwDetectorWithState: a: 2
07-20 09:45:32.863  3056  3056 E HotwordState: FASE: true, SHwR: false, ACR: true, HR: false, ACbSS: false, ACbHE: false, SO:false, ARS: false
07-20 09:45:32.864  3056  4276 I SodaHwDetectionManager: #stopHotwordDetectionInternal
07-20 09:45:32.891  2817  4980 I NearbyDiscovery: FastPairHandler: Received action android.intent.action.SCREEN_OFF [CONTEXT service_id=49 ]
07-20 09:45:32.892  2817  4980 I NearbyDiscovery: FastPairScanner2: Stopping scan [CONTEXT service_id=49 ]
ulno commented 4 years ago

I did some further testing (compared a lot of dumpsys and settings listings) and I think the only possible fix would be to let the server be installed and running as the inconsistency seems to only occur when it stops (only one process allowed to use that surface based display power setting feature?). Maybe extracting the "turning display off" into its own service could make sense too. If we run into permisson problems we could potentially just put the server into a detached adb-session and connect to that the second time we run scrcpy. Would that be possible and how much effort would it involve?