;Dthx for rply.
Here is my whole log :
glxinfo-->
name of display: :0.0
X Error of failed request: BadRequest(invalid request code or no such operation)
Major opcode of failed request: (GLX)
Minor opcode of failed request: 19 (X_GLXQueryServerString)
Serial number of failed reqiest: 12
Current serial number in output stream: 12
I am using Xorg 7.5,XFCE 4 32bit System, ATI mobility radeon 5470 HD
blacklist=radeon desktop=xfce4 kernel options
loaded modules :
acpi_cpufreq 12288 1 - Live 0xf8861000
cpufreq_userspace 12288 0 - Live 0xf8857000
mperf 12288 1 acpi_cpufreq, Live 0xf8850000
cpufreq_powersave 12288 0 - Live 0xf884a000
cpufreq_conservative 12288 0 - Live 0xf88af000
cpufreq_stats 12288 0 - Live 0xf88a9000
oss_usb 102400 0 - Live 0xf8866000
oss_hdaudio 143360 0 - Live 0xf86c3000
osscore 507904 2 oss_usb,oss_hdaudio, Live 0xf871f000
i2c_i801 12288 0 - Live 0xf8692000
intel_agp 12288 0 - Live 0xf868e000
fglrx 2289664 0 - Live 0xf8986000 (P)
intel_gtt 16384 1 intel_agp, Live 0xf8bbc000
agpgart 24576 3 intel_agp,fglrx,intel_gtt, Live 0xf80c1000
squashfs 24576 92 - Live 0xf80c9000
scsi_wait_scan 12288 0 - Live 0xf80bd000
zcache 12288 0 - Live 0xf8083000 (PC)
zram 12288 1 - Live 0xf8088000 (C)
loop 16384 184 - Live 0xf80f4000
dell_wmi 12288 0 - Live 0xf807f000
sparse_keymap 12288 1 dell_wmi, Live 0xf8065000
intel_ips 16384 0 - Live 0xf807a000
pcspkr 12288 0 - Live 0xf8043000
video 16384 0 - Live 0xf806b000
r8169 32768 0 - Live 0xf8071000
wmi 12288 1 dell_wmi, Live 0xf8059000
backlight 12288 1 video, Live 0xf8053000
bcma 16384 0 - Live 0xf804e000
battery 12288 0 - Live 0xf804a000
ac 12288 0 - Live 0xf803f000
compiz error :
compiz.real (core ) fatal: root visual is not a GL Visual
error: failed to manage screen :0
fatal: no managable screens found on display
lauching to fallback window mode
glib-critical g_str_has_prefix
xfwm4 failed to connect to session manager
session_manager environment varible not defined
also tried aticonfig --initial & then startx gives black screen with mouse pointer