screen goes blank sometimes while running blender

hello

which graphics card are you using?

well i dont know where i can find this information. But 'screen and graphics' wizard shows vesa driver.
can you tell me where i can find this information. i have searched hardware information wizard but couldn't find anything there

OK! dont worry mate!

Paste the output of

lspci

command in a terminal here

Regards

00:00.0 Host bridge: Intel Corporation Mobile PM965/GM965/GL960 Memory Controller Hub (rev 0c)
00:02.0 VGA compatible controller: Intel Corporation Mobile GM965/GL960 Integrated Graphics Controller (rev 0c)
00:02.1 Display controller: Intel Corporation Mobile GM965/GL960 Integrated Graphics Controller (rev 0c)
00:1a.0 USB Controller: Intel Corporation 82801H (ICH8 Family) USB UHCI Contoller #4 (rev 03)
00:1a.1 USB Controller: Intel Corporation 82801H (ICH8 Family) USB UHCI Controller #5 (rev 03)
00:1a.7 USB Controller: Intel Corporation 82801H (ICH8 Family) USB2 EHCI Controller #2 (rev 03)
00:1b.0 Audio device: Intel Corporation 82801H (ICH8 Family) HD Audio Controller (rev 03)
00:1c.0 PCI bridge: Intel Corporation 82801H (ICH8 Family) PCI Express Port 1 (rev 03)
00:1c.1 PCI bridge: Intel Corporation 82801H (ICH8 Family) PCI Express Port 2 (rev 03)
00:1c.2 PCI bridge: Intel Corporation 82801H (ICH8 Family) PCI Express Port 3 (rev 03)
00:1c.4 PCI bridge: Intel Corporation 82801H (ICH8 Family) PCI Express Port 5 (rev 03)
00:1d.0 USB Controller: Intel Corporation 82801H (ICH8 Family) USB UHCI Controller #1 (rev 03)
00:1d.1 USB Controller: Intel Corporation 82801H (ICH8 Family) USB UHCI Controller #2 (rev 03)
00:1d.2 USB Controller: Intel Corporation 82801H (ICH8 Family) USB UHCI Controller #3 (rev 03)
00:1d.7 USB Controller: Intel Corporation 82801H (ICH8 Family) USB2 EHCI Controller #1 (rev 03)
00:1e.0 PCI bridge: Intel Corporation 82801 Mobile PCI Bridge (rev f3)
00:1f.0 ISA bridge: Intel Corporation 82801HEM (ICH8M) LPC Interface Controller (rev 03)
00:1f.1 IDE interface: Intel Corporation 82801HBM/HEM (ICH8M/ICH8M-E) IDE Controller (rev 03)
00:1f.2 SATA controller: Intel Corporation 82801HBM/HEM (ICH8M/ICH8M-E) SATA AHCI Controller (rev 03)
02:04.0 CardBus bridge: Ricoh Co Ltd RL5c476 II (rev b6)
10:00.0 Network controller: Intel Corporation PRO/Wireless 3945ABG Network Connection (rev 02)
18:00.0 Ethernet controller: Broadcom Corporation NetLink BCM5906M Fast Ethernet PCI Express (rev 02)

also please give answer of second question

OK!

Your video card is found from:

00:02.0 VGA compatible controller: Intel Corporation Mobile GM965/GL960 Integrated Graphics Controller (rev 0c)

Secondly try running:

metacity --replace

Regards

Ok! but now what should i do to avoid blender from hanging my pc.
i tried metacity --replace but nothing happened

i dont know what would be a better alternative for your Intel card but the vesa driver is not ample if you do stuff like 3D modeling.
You cant even switch on 3D acceleration if you use vesa am I right!?
What CPU do you use? The work for rendering is almost only done by the CPU so if you want to render really big stuff but have a small CPU you know what the problem could be.
Do you use the most current blender version 2.46?
by the way the next time it crashes you should find some information about the crash in your system logfiles. you can get there by system, administration, system logfiles ( srry for the bad translation but i dont use a englisch Ubuntu).

hello!
   as far as cpu is concerned i have got Intel(R) Core(TM)2 Duo CPU T7100 @ 1.80GHz with 512 MB ram. So i dont think it will be of big concern. I collected information from system log which i am pasting here

daemon.log

Jul 7 19:33:35 niraj-laptop gdm[5518]: WARNING: gdm_slave_xioerror_handler: Fatal X error - Restarting :0
Jul 7 19:33:56 niraj-laptop init: tty4 main process (4685) killed by TERM signal
Jul 7 19:33:56 niraj-laptop init: tty5 main process (4686) killed by TERM signal
Jul 7 19:33:56 niraj-laptop init: tty2 main process (4690) killed by TERM signal
Jul 7 19:33:56 niraj-laptop init: tty3 main process (4691) killed by TERM signal
Jul 7 19:33:56 niraj-laptop init: tty1 main process (4692) killed by TERM signal
Jul 7 19:33:56 niraj-laptop init: tty6 main process (4694) killed by TERM signal

kern.log

Jul 7 19:33:34 niraj-laptop kernel: [ 119.176908] [drm:i915_wait_irq] *ERROR* i915_wait_irq: EBUSY -- rec: 49328 emitted: 49379

syslog

Jul 7 19:33:34 niraj-laptop kernel: [ 119.176908] [drm:i915_wait_irq] *ERROR* i915_wait_irq: EBUSY -- rec: 49328 emitted: 49379
Jul 7 19:33:35 niraj-laptop gdm[5518]: WARNING: gdm_slave_xioerror_handler: Fatal X error - Restarting :0
Jul 7 19:33:56 niraj-laptop init: tty4 main process (4685) killed by TERM signal
Jul 7 19:33:56 niraj-laptop init: tty5 main process (4686) killed by TERM signal
Jul 7 19:33:56 niraj-laptop init: tty2 main process (4690) killed by TERM signal
Jul 7 19:33:56 niraj-laptop init: tty3 main process (4691) killed by TERM signal
Jul 7 19:33:56 niraj-laptop init: tty1 main process (4692) killed by TERM signal
Jul 7 19:33:56 niraj-laptop init: tty6 main process (4694) killed by TERM signal
Jul 7 19:34:07 niraj-laptop avahi-daemon[5429]: Got SIGTERM, quitting.
Jul 7 19:34:07 niraj-laptop avahi-daemon[5429]: Leaving mDNS multicast group on interface eth1.IPv4 with address 192.168.1.2.
Jul 7 19:34:10 niraj-laptop exiting on signal 15

can you find something out of this helpful ?

version of blender installed on my system is 2.44 . My package manager shows 2.44 version as latest one.
can i upgrade it to 2.46 by any way?how? or it is necessery to delete old version and get new one ? can i get it through package manager?

the abrheviations in the WARNING line are something like Gnome Desktop Manager X-Server Input/Output Error.
I dont know how to fix that(:
Which package manager do you use? i updated to 2.45 with the update manager you can find it inthe synaptic package manager too.
this version is focused on stability.

well my update manager does not show any update for blender 2.44 may this is last version for 'amd-64' bit ubuntu 7.10 can you atleast tell me command to update it forcefully or reinstall latest version

Thanks Jonas Jabs, that solved my question.

Thanks once again. This version 2.45 is really stable one. At least till now i haven't faced any problem