Another interesting thing with this xserver-xorg-core is that it ignores Option "AIGLX" "Off" in the ServerFlags section and initializes AIGLX. This also hasn't happened before bionic.
And the crashing (see the Xorg.0.log in my previous post) seems to happen right where normally some AIGLX initialization is logged. Here's a Xorg.0.log with Composite *not* disabled, but trying to disable AIGLX. Seems like it gets ignored and the crash with trying to startx with Composite Disable happens right before the following: [ 87.708] (II) AIGLX: enabled GLX_MESA_copy_sub_buffer [ 87.708] (II) AIGLX: enabled GLX_ARB_create_context [ 87.708] (II) AIGLX: enabled GLX_ARB_create_context_profile [ 87.708] (II) AIGLX: enabled GLX_EXT_create_context_es{,2}_profile [ 87.708] (II) AIGLX: enabled GLX_INTEL_swap_event [ 87.708] (II) AIGLX: enabled GLX_SGI_swap_control [ 87.708] (II) AIGLX: enabled GLX_EXT_framebuffer_sRGB [ 87.708] (II) AIGLX: enabled GLX_ARB_fbconfig_float [ 87.708] (II) AIGLX: enabled GLX_EXT_fbconfig_packed_float [ 87.708] (II) AIGLX: GLX_EXT_texture_from_pixmap backed by buffer objects [ 87.708] (II) AIGLX: Loaded and initialized i965 My xorg.conf: Section "ServerFlags" Option "AIGLX" "off" EndSection Section "Device" Identifier "Intel GMA 450" Driver "intel" EndSection Section "Extensions" # Option "Composite" "0" EndSection ** Attachment added: "Full Xorg.0.log when starting normally" https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/1754177/+attachment/5072490/+files/Xorg.0.log -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xorg-server in Ubuntu. https://bugs.launchpad.net/bugs/1754177 Title: [bionic] xserver / startx crashes with Composite Disabled in xorg.conf To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/1754177/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp