nexus10: unity-system-compositor crashes while turning display on with power key [std::exception::what: error turning display on. rc = fffffff0]

[Andreas Pokorny]

unity-system-compositor-log (still on top of 0.13.3 - without 0.14.0) with exception that causes the crash:

[1437824578.379250] mirplatform: Found graphics driver: android
[1437824578.379366] mirplatform: Found graphics driver: dummy
[1437824578.390219] Server: Starting
[1437824578.393296] Loader: Loading modules from: /usr/lib/arm-linux-gnueabihf/mir/server-platform
[1437824578.393433] Loader: Loading module: /usr/lib/arm-linux-gnueabihf/mir/server-platform/input-stub.so
[1437824578.394298] Loader: Loading module: /usr/lib/arm-linux-gnueabihf/mir/server-platform/graphics-android.so.2
[1437824578.394348] Loader: Loading module: /usr/lib/arm-linux-gnueabihf/mir/server-platform/graphics-dummy.so
[1437824578.399155] mirplatform: Found graphics driver: android
[1437824578.399198] mirplatform: Found graphics driver: dummy
[1437824578.399436] Platform Loader: Selected driver: android (version 0.13.3)
[1437824579.150982] mirserver: Using software cursor
GL_VENDOR = ARM
GL_RENDERER = Mali-T604
GL_VERSION = OpenGL ES 3.0
dm_connection_start
[1437824579.197658] GL: vendor: ARM
[1437824579.197683] GL: renderer: Mali-T604
[1437824579.197691] GL: version: OpenGL ES 3.0
[1437824579.197699] GL: SL version: OpenGL ES GLSL ES 3.00
[1437824579.197712] GL: max texture size = 8192
[1437824579.197735] GL: framebuffer bits: RGBA=8888, depth=0, stencil=0
[1437824579.203708] DisplayServer: Mir version 0.13.3
set_active_session 'session-0'
Opening session eglspinner
Opening session session-0
Closing session session-0
Opening session session-0
Closing session eglspinner
Current active output is 2560x1600 +0+0
Server supports 3 of 6 surface pixel formats. Using format: 1
Signal 15 received. Good night.
Closing session session-0
ERROR: /build/buildd/mir-0.13.3+15.04.20150617/src/platforms/android/server/real_hwc_wrapper.cpp(156): Throw in function virtual void mir::graphics::android::RealHwcWrapper::display_on(mir::graphics::android::DisplayName) const
Dynamic exception type: N5boost16exception_detail10clone_implINS0_19error_info_injectorISt13runtime_errorEEEE
std::exception::what: error turning display on. rc = fffffff0

Can't get connection

A manual restart of lightdm resolves the issue. usc starts up fine and is able to turn the display on. Sometimes afer waiting long enough lightdm seems to become aware of the situation and respawns unity-system-compositor. So we might derive another bug for lightdm - as it takes far too long to detect the crash.

I havent tried yet 0.14.0 - but it should happen there too.

[Andreas Pokorny (andreas-pokorny)]

The restarting sometimes seems to fail too. I just left the device alone for a few minutes, and the backlight started to flash.

[Andreas Pokorny (andreas-pokorny)]

Oh seems like I have fix/workaround.

[Daniel van Vugt (vanvugt)]

I can only seem to get channel "devel" (vivid) booting on the Nexus 10. Any trick to getting devel-proposed (wily) going? Do I need to do a manual command-line dist upgrade?

[Kevin DuBois (kdub)]

what is the fix?

[Kevin DuBois (kdub)]

also, nexus 10 has a low need for support right now, maybe 'high' is a better priority, if it only affects this particular device.

[kevin gunn (kgunn72)]

yeah, nexus10 is not a hard reference target. I believe foundation team considers it 'unofficial' in fact.

[Daniel van Vugt (vanvugt)]

Our wikis suggest Nexus 10 is a first class device still. I'm not sure that's accurate...
https://developer.ubuntu.com/en/start/ubuntu-for-devices/devices/
https://wiki.ubuntu.com/Touch/Devices

[Andreas Pokorny (andreas-pokorny)]

@kdub: Adding something to not throwing but log the failure to blank.. This made the system successfully turn the screen on and off but after a time it still started to flicker..

[Daniel van Vugt (vanvugt)]

Dropped importance. N10 is likely not a supported device. And nobody seems to have a problem with this bug having been mostly ignored for over 100 days.

[Daniel van Vugt (vanvugt)]

The Android platform was deleted from lp:mir at revision 4155.