Created attachment 488310 [details]
Xsession errors

Description of problem:
GNome 3 failed with Radeon 5600. On my Dell Inspiron N4010,  ATI Technologies Inc Redwood [Radeon HD 5600 Series], xorg-x11-drv-ati-6.14.0-7.20110316gitcdfc007ec.fc15.x86_64 installed, No xorg.conf is defined. GNome 3 failed with one oops diaglog.

lspci --nn
00:00.0 Host bridge [0600]: Intel Corporation Core Processor DRAM Controller [8086:0044] (rev 18)
00:01.0 PCI bridge [0604]: Intel Corporation Core Processor PCI Express x16 Root Port [8086:0045] (rev 18)
00:16.0 Communication controller [0780]: Intel Corporation 5 Series/3400 Series Chipset HECI Controller [8086:3b64] (rev 06)
00:1a.0 USB Controller [0c03]: Intel Corporation 5 Series/3400 Series Chipset USB2 Enhanced Host Controller [8086:3b3c] (rev 06)
00:1b.0 Audio device [0403]: Intel Corporation 5 Series/3400 Series Chipset High Definition Audio [8086:3b56] (rev 06)
00:1c.0 PCI bridge [0604]: Intel Corporation 5 Series/3400 Series Chipset PCI Express Root Port 1 [8086:3b42] (rev 06)
00:1c.1 PCI bridge [0604]: Intel Corporation 5 Series/3400 Series Chipset PCI Express Root Port 2 [8086:3b44] (rev 06)
00:1c.5 PCI bridge [0604]: Intel Corporation 5 Series/3400 Series Chipset PCI Express Root Port 6 [8086:3b4c] (rev 06)
00:1d.0 USB Controller [0c03]: Intel Corporation 5 Series/3400 Series Chipset USB2 Enhanced Host Controller [8086:3b34] (rev 06)
00:1e.0 PCI bridge [0604]: Intel Corporation 82801 Mobile PCI Bridge [8086:2448] (rev a6)
00:1f.0 ISA bridge [0601]: Intel Corporation Mobile 5 Series Chipset LPC Interface Controller [8086:3b0b] (rev 06)
00:1f.2 SATA controller [0106]: Intel Corporation 5 Series/3400 Series Chipset 6 port SATA AHCI Controller [8086:3b2f] (rev 06)
00:1f.3 SMBus [0c05]: Intel Corporation 5 Series/3400 Series Chipset SMBus Controller [8086:3b30] (rev 06)
00:1f.6 Signal processing controller [1180]: Intel Corporation 5 Series/3400 Series Chipset Thermal Subsystem [8086:3b32] (rev 06)
02:00.0 VGA compatible controller [0300]: ATI Technologies Inc Redwood [Radeon HD 5600 Series] [1002:68c1]
02:00.1 Audio device [0403]: ATI Technologies Inc Redwood HDMI Audio [Radeon HD 5600 Series] [1002:aa60]
04:00.0 Network controller [0280]: Intel Corporation Centrino Wireless-N 1000 [8086:0083]
05:00.0 Ethernet controller [0200]: Atheros Communications AR8152 v1.1 Fast Ethernet [1969:2060] (rev c1)
ff:00.0 Host bridge [0600]: Intel Corporation Core Processor QuickPath Architecture Generic Non-core Registers [8086:2c62] (rev 05)
ff:00.1 Host bridge [0600]: Intel Corporation Core Processor QuickPath Architecture System Address Decoder [8086:2d01] (rev 05)
ff:02.0 Host bridge [0600]: Intel Corporation Core Processor QPI Link 0 [8086:2d10] (rev 05)
ff:02.1 Host bridge [0600]: Intel Corporation Core Processor QPI Physical 0 [8086:2d11] (rev 05)
ff:02.2 Host bridge [0600]: Intel Corporation Core Processor Reserved [8086:2d12] (rev 05)
ff:02.3 Host bridge [0600]: Intel Corporation Core Processor Reserved [8086:2d13] (rev 05)


grub.conf:

  default=0
  timeout=2
  splashimage=(hd0,0)/grub/splash.xpm.gz
  hiddenmenu
  title Fedora (2.6.38.1-6.fc15.x86_64)
        root (hd0,0)
        kernel /vmlinuz-2.6.38.1-6.fc15.x86_64 ro root=/dev/mapper/vg_maimai-lv_root rd_LVM_LV=vg_maimai/lv_root rd_LVM_LV=vg_maimai/lv_swap rd_NO_LUKS rd_NO_MD rd_NO_DM LANG=en_US.UTF-8 SYSFONT=latarcyrheb-sun16 KEYTABLE=us nomodeset rhgb quiet
        initrd /initramfs-2.6.38.1-6.fc15.x86_64.img
  title Fedora (2.6.38.1-6.fc15.x86_64-Radeon)
        root (hd0,0)
        kernel /vmlinuz-2.6.38.1-6.fc15.x86_64 ro root=/dev/mapper/vg_maimai-lv_root rd_LVM_LV=vg_maimai/lv_root rd_LVM_LV=vg_maimai/lv_swap rd_NO_LUKS LANG=en_US.UTF-8 SYSFONT=latarcyrheb-sun16 KEYTABLE=us radeon.modeset=1 rhgb quiet
        initrd /initramfs-2.6.38.1-6.fc15.x86_64.img

With nomodeset, I will get the failsafe gnome session. With Radeon modeset, I will get one warning diaglog, report that gnome has some errors and I should log out.