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[Malte Probst <644740@xxxxxxxxxxxxxxxxxx>]

I am running Ubuntu 10.04.1 LTS  (netbook edition) on a Samsung N220 plus with Gnome 2.30.2, Xorg 1:7.5+5ubuntu1
I saw the same behavior (flickering display, xserver stopping, unable to restart X. reboot necessary) a couple of times in the last weeks, but could pin it down to any single action.
/sys/kernel/debug/dri/0/i915_error_state was not holding any information (rebooted in the mean time)

Cheers
Malte

(posting my first bug, don't be too harsh on me for missing or imprecise
information =)

syslog excerpt:
kernel: [ 5594.224067] [drm:i915_hangcheck_elapsed] *ERROR* Hangcheck timer elapsed... GPU hung
kernel: [ 5594.224089] render error detected, EIR: 0x00000000
kernel: [ 5594.224148] [drm:i915_do_wait_request] *ERROR* i915_do_wait_request returns -5 (awaiting 437467 at 437459)
NetworkManager: <info>  (eth1): device state change: 8 -> 3 (reason 38)
NetworkManager: <info>  (eth1): deactivating device (reason: 38).
NetworkManager: <info>  (eth1): canceled DHCP transaction, dhcp client pid 3242
NetworkManager: <WARN>  check_one_route(): (eth1) error -34 returned from rtnl_route_del(): Sucess#012
avahi-daemon[739]: Withdrawing address record for 192.168.1.103 on eth1.
avahi-daemon[739]: Leaving mDNS multicast group on interface eth1.IPv4 with address 192.168.1.103.
avahi-daemon[739]: Interface eth1.IPv4 no longer relevant for mDNS.
wpa_supplicant[858]: CTRL-EVENT-DISCONNECTED - Disconnect event - remove keys
kernel: [ 5598.971112] [drm] Big FIFO is enabled
acpid: client 951[0:0] has disconnected
acpid: client connected from 3398[0:0]
acpid: 1 client rule loaded
kernel: [ 5602.563540] [drm] Big FIFO is enabled
kernel: [ 5602.906838] [drm] Big FIFO is enabled
acpid: client 3398[0:0] has disconnected
acpid: client connected from 3415[0:0]
acpid: 1 client rule loaded
kernel: [ 5603.162410] [drm] Big FIFO is enabled
kernel: [ 5603.479334] [drm] Big FIFO is enabled
gdm-binary[750]: WARNING: GdmDisplay: display lasted 0,571364 seconds
acpid: client 3415[0:0] has disconnected
acpid: client connected from 3422[0:0]
acpid: 1 client rule loaded
kernel: [ 5603.740346] [drm] Big FIFO is enabled
kernel: [ 5604.059952] [drm] Big FIFO is enabled
gdm-binary[750]: WARNING: GdmDisplay: display lasted 0,578838 seconds
(repeated multiple times, only reboot helps)

-- 
[GM45] GPU Hang when enabling KDE desktop effects
https://bugs.launchpad.net/bugs/644740
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