Description of problem: My system runs into a soft lockup after some time, seemingly at random, but it could be that it only happens after ~30 min of idling. The display goes blank, the monitor says "No signal", but I can still ssh into the machine. I am not able to wake it up by ctrl-alt-f2 or the like. "init 3" as root does not work, and I can't seem to kill any running programs (over ssh, as root - the shell never returns) In /var/log/messages I get: INFO: task events/0:9 blocked for more than 120 seconds. "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. events/0 D ffff88012de02024 0 9 2 ffff88012fb31d60 0000000000000046 0000000000000001 ffffffffa04774eb ffff88012fb31cf0 ffffffff81046bf0 ffff88012fb31cf0 000000008604ee9e ffff88012fb060e8 000000000000e2e8 ffff88012fb060e8 0000000000012cc0 Call Trace: [] ? mantis_query_rc+0x0/0x89 [mantis] [] ? dequeue_entity+0x2f/0x1e8 [] ? dequeue_task_fair+0x81/0xa0 [] ? __switch_to+0x19c/0x23c [] __mutex_lock_common+0x12c/0x1a8 [] __mutex_lock_slowpath+0x2c/0x42 [] mutex_lock+0x43/0x71 [] i915_gem_retire_work_handler+0x40/0x96 [i915] [] ? i915_gem_retire_work_handler+0x0/0x96 [i915] [] worker_thread+0x1ab/0x25d [] ? autoremove_wake_function+0x0/0x5f [] ? worker_thread+0x0/0x25d [] kthread+0x6d/0xae [] child_rip+0xa/0x20 [] ? restore_args+0x0/0x30 [] ? kthread+0x0/0xae [] ? child_rip+0x0/0x20 INFO: task events/0:9 blocked for more than 120 seconds. "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. events/0 D ffff88012de02024 0 9 2 ffff88012fb31d60 0000000000000046 0000000000000001 ffffffffa04774eb ffff88012fb31cf0 ffffffff81046bf0 ffff88012fb31cf0 000000008604ee9e ffff88012fb060e8 000000000000e2e8 ffff88012fb060e8 0000000000012cc0 Call Trace: [] ? mantis_query_rc+0x0/0x89 [mantis] [] ? dequeue_entity+0x2f/0x1e8 [] ? dequeue_task_fair+0x81/0xa0 [] ? __switch_to+0x19c/0x23c [] __mutex_lock_common+0x12c/0x1a8 [] __mutex_lock_slowpath+0x2c/0x42 [] mutex_lock+0x43/0x71 [] i915_gem_retire_work_handler+0x40/0x96 [i915] [] ? i915_gem_retire_work_handler+0x0/0x96 [i915] [] worker_thread+0x1ab/0x25d [] ? autoremove_wake_function+0x0/0x5f [] ? worker_thread+0x0/0x25d [] kthread+0x6d/0xae [] child_rip+0xa/0x20 [] ? restore_args+0x0/0x30 [] ? kthread+0x0/0xae [] ? child_rip+0x0/0x20 INFO: task events/0:9 blocked for more than 120 seconds. "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. events/0 D ffff88012de02024 0 9 2 ffff88012fb31d60 0000000000000046 0000000000000001 ffffffffa04774eb ffff88012fb31cf0 ffffffff81046bf0 ffff88012fb31cf0 000000008604ee9e ffff88012fb060e8 000000000000e2e8 ffff88012fb060e8 0000000000012cc0 Call Trace: [] ? mantis_query_rc+0x0/0x89 [mantis] [] ? dequeue_entity+0x2f/0x1e8 [] ? dequeue_task_fair+0x81/0xa0 [] ? __switch_to+0x19c/0x23c [] __mutex_lock_common+0x12c/0x1a8 [] __mutex_lock_slowpath+0x2c/0x42 [] mutex_lock+0x43/0x71 [] i915_gem_retire_work_handler+0x40/0x96 [i915] [] ? i915_gem_retire_work_handler+0x0/0x96 [i915] [] worker_thread+0x1ab/0x25d [] ? autoremove_wake_function+0x0/0x5f [] ? worker_thread+0x0/0x25d [] kthread+0x6d/0xae [] child_rip+0xa/0x20 [] ? restore_args+0x0/0x30 [] ? kthread+0x0/0xae [] ? child_rip+0x0/0x20 Version-Release number of selected component (if applicable): How reproducible: Always, random. Steps to Reproduce: 1. Leave the system idle. Additional info: http://www.smolts.org/client/show/pub_d59a227e-c82a-469a-94fb-68b8de343818 00:02.0 VGA compatible controller: Intel Corporation 82G35 Express Integrated Graphics Controller (rev 03) 00:02.1 Display controller: Intel Corporation 82G35 Express Integrated Graphics Controller (rev 03) # rpm -qa \*intel\* xorg-x11-drv-intel-2.7.0-7.fc11.x86_64 xorg-x11-drv-intel-debuginfo-2.7.0-4.fc11.x86_64 intel-gpu-tools-2.7.0-7.fc11.x86_64 xorg-x11-drv-intel-devel-2.7.0-7.fc11.x86_64 kernel-2.6.30.5-43.fc11.x86_64 # modinfo mantis filename: /lib/modules/2.6.30.5-43.fc11.x86_64/kernel/drivers/media/dvb/mantis/mantis.ko license: GPL author: Manu Abraham description: Mantis PCI DTV bridge driver srcversion: 1705C063CE013A7DAD9F6B0 alias: pci:v00001822d00004E35sv*sd*bc*sc*i* depends: ir-common,dvb-core,stv0299,i2c-core,stb0899,tda10023,tda10021,stb6100,mb86a16,lnbp21 vermagic: 2.6.30.5-43.fc11.x86_64 SMP mod_unload parm: adapter_nr:DVB adapter numbers (array of short) parm: verbose:verbose startup messages, default is 1 (yes) (int) The mantis driver is for the DVB-C card (digital TV card) that is in use on this media center pc. Is the bug in 1. the intel driver? 2. the mantis driver 3. the kernel? 4. ? (what is events/0:9?)