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Description of problem: With F-15's gnome-session-3.0.1-2.fc15, gnome-session spawns gnome-shell just fine. After upgrading to the F-16 pre-alpha, however, I get to the fallback mode instead, with a notification box saying my graphics card is not supported. Manually invoking 'gnome-shell --replace' starts it just fine. Version-Release number of selected component (if applicable): gnome-session-3.1.3-1.fc16.x86_64 gnome-shell-3.1.4-1.fc16.x86_64 mesa-dri-drivers-7.11-1.fc16.x86_64 xorg-x11-drv-ati-6.14.2-1.20110727git8c9266ed2.fc16.x86_64 How reproducible: Always Steps to Reproduce: 1. Upgrade to F-16 2. Log in Actual results: Starts in fallback mode. ~/.xsession-errors contains gnome-session[2992]: WARNING: Session 'gnome' runnable check failed: Exited with code 1 Expected results: GNOME Shell should be started Additional info: Relevant lspci -vv section: 01:00.0 VGA compatible controller: ATI Technologies Inc Redwood [Radeon HD 5600 Series] (prog-if 00 [VGA controller]) Subsystem: Sony Corporation Device 9071 Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+ Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx- Latency: 0, Cache Line Size: 64 bytes Interrupt: pin A routed to IRQ 42 Region 0: Memory at e0000000 (64-bit, prefetchable) [size=256M] Region 2: Memory at f0020000 (64-bit, non-prefetchable) [size=128K] Region 4: I/O ports at d000 [size=256] Expansion ROM at f0000000 [disabled] [size=128K] Capabilities: <access denied> Kernel driver in use: radeon Kernel modules: radeon
Per https://bugzilla.redhat.com/show_bug.cgi?id=712785: $ /usr/libexec/gnome-session-check-accelerated ; echo $? 1 $ /usr/libexec/gnome-session-check-accelerated-helper ; echo $? 0 I am running a custom 3.0.0 kernel, but the configuration is based on the F-15 kernel, and before updating to F-16 pre-alpha gnome-session happily enables GNOME Shell.
Removing the X property and retrying gnome-session-check-accelerated works, so it's not a gnome-session bug. Turns out to be the recently-fixed GDM issue: * Wed Aug 03 2011 Lennart Poettering <lpoetter@redhat.com> - 1:3.1.2-4 - Register welcome pseudo-session in PAM https://admin.fedoraproject.org/updates/udev-173-1.fc16,gdm-3.1.2-4.fc16,systemd-33-1.fc16?_csrf_token=5d60e0c5aa4eff9fef6b054046edc529f88c9021