Nvidia Prime is a bit deceiving here. Prime typically works by wiring the Intel GPU to the display and just using the Nvidia chip for indirect rendering (if desired).
And that's what's going on here too. Mir does not support the Nvidia driver, but it started successfully because Mir is actually just using the Intel graphics driver: [2016-02-28 19:27:03.147913] mirplatform: Found graphics driver: mir:mesa-kms (version 0.20.0) [2016-02-28 19:27:03.147975] mirplatform: Found graphics driver: mir:mesa-x11 (version 0.20.0) qtmir.mir: MirServer created [2016-02-28 19:27:03.148721] mirserver: Starting [2016-02-28 19:27:03.298794] mirserver: Using nested cursor [2016-02-28 19:27:03.445320] mirserver: Initial display configuration: [2016-02-28 19:27:03.445621] mirserver: 0.34: eDP 15,3" 340x190mm [2016-02-28 19:27:03.445633] mirserver: Current mode 3840x2160 47,99Hz [2016-02-28 19:27:03.445648] mirserver: Preferred mode 3840x2160 47,99Hz [2016-02-28 19:27:03.445653] mirserver: Logical position +0+0 [2016-02-28 19:27:03.445661] mirserver: 0.31: unused VGA [2016-02-28 19:27:03.445667] mirserver: 0.42: unused HDMI-A 7f1e67234000-7f1e6780b000 r-xp 00000000 00:15 4064527 /usr/lib/x86_64-linux-gnu/dri/i965_dri.so 7f1e6780b000-7f1e67a0b000 ---p 005d7000 00:15 4064527 /usr/lib/x86_64-linux-gnu/dri/i965_dri.so 7f1e67a0b000-7f1e67a3c000 r--p 005d7000 00:15 4064527 /usr/lib/x86_64-linux-gnu/dri/i965_dri.so 7f1e67a3c000-7f1e67a43000 rw-p 00608000 00:15 4064527 /usr/lib/x86_64-linux-gnu/dri/i965_dri.so The crash is occurring still, unfortunately because of Nvidia prime. You have Unity8 starting, but trying to use the wrong libGL (the Nvidia one which we don't support). The reason why USC will work here, but Unity8 won't is possibly because USC is native GLESv2, but Unity8/QtMir on desktop uses full GL. So you may not encounter a crash till Unity8 starts. Still, we have started up OK apparently using Intel graphics. I wonder if we can make Unity8 find the correct libGL... ** Summary changed: - unity8-dash crashed with SIGSEGV in glGetString() + Nvidia Prime graphics: unity8-dash crashed with SIGSEGV in glGetString() -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to mir in Ubuntu. https://bugs.launchpad.net/bugs/1550972 Title: Nvidia Prime graphics: unity8-dash crashed with SIGSEGV in glGetString() Status in Mir: New Status in mir package in Ubuntu: New Status in qtbase-opensource-src package in Ubuntu: New Status in unity8 package in Ubuntu: Incomplete Bug description: Lenovo Y50 notebook with NVidia Prime profile. Login with unity8 shows black screen. Login with ubuntu works fine. ProblemType: Crash DistroRelease: Ubuntu 16.04 Package: unity8 8.11+16.04.20160216.1-0ubuntu1 ProcVersionSignature: Ubuntu 4.4.0-8.23-generic 4.4.2 Uname: Linux 4.4.0-8-generic x86_64 NonfreeKernelModules: nvidia_uvm nvidia ApportVersion: 2.20-0ubuntu3 Architecture: amd64 Date: Sun Feb 28 19:27:08 2016 ExecutablePath: /usr/bin/unity8-dash InstallationDate: Installed on 2014-10-02 (514 days ago) InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2) ProcCmdline: unity8-dash --desktop_file_hint=/usr/share/applications/unity8-dash.desktop ProcEnviron: LANGUAGE=hu PATH=(custom, no user) XDG_RUNTIME_DIR=<set> LANG=hu_HU.UTF-8 SHELL=/bin/bash Signal: 11 SourcePackage: unity8 StacktraceTop: glGetString () from /usr/lib/nvidia-340-updates/libGL.so.1 QOpenGLContext::makeCurrent(QSurface*) () from /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5 ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5 ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5 start_thread (arg=0x7f1e26dc9700) at pthread_create.c:333 Title: unity8-dash crashed with SIGSEGV in glGetString() UpgradeStatus: Upgraded to xenial on 2016-02-21 (7 days ago) UserGroups: adm cdrom dip docker lpadmin plugdev sambashare sudo To manage notifications about this bug go to: https://bugs.launchpad.net/mir/+bug/1550972/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
