I've had same problem as AllesMeins. DVD burning was working fine with Dapper and Edgy but became unreliable and cause system freeze 1 time out 2 tries. Some times the system just froze, sometimes it would freeze for a dozen of seconds then came back for 1 sec then froze again for a dozen of seconds then came back then freeze... Some times the burning would finished but the disc is unusable. It would occured regardless of the tools: growisofs or nautilus-burner. This system run Ubuntu (not Kubuntu). Package: linux-image-2.6.20-16-generic /var/log/kernel Jul 9 17:56:58 hanhi kernel: [ 4320.668000] hdd: DMA timeout retry Jul 9 17:56:58 hanhi kernel: [ 4320.668000] hdd: timeout waiting for DMA Jul 9 17:57:03 hanhi kernel: [ 4325.672000] hdd: status timeout: status=0xd0 { Busy } Jul 9 17:57:03 hanhi kernel: [ 4325.672000] ide: failed opcode was: unknown Jul 9 17:57:03 hanhi kernel: [ 4325.672000] hdd: drive not ready for command Jul 9 17:57:07 hanhi kernel: [ 4330.408000] BUG: soft lockup detected on CPU#0! Jul 9 17:57:07 hanhi kernel: [ 4330.408000] [softlockup_tick+156/240] softlockup_tick+0x9c/0xf0 Jul 9 17:57:07 hanhi kernel: [ 4330.408000] [update_process_times+51/128] update_process_times+0x33/0x80 Jul 9 17:57:07 hanhi kernel: [ 4330.408000] [smp_apic_timer_interrupt+112/128] smp_apic_timer_interrupt+0x70/0x80 Jul 9 17:57:07 hanhi kernel: [ 4330.408000] [apic_timer_interrupt+40/48] apic_timer_interrupt+0x28/0x30 Jul 9 17:57:07 hanhi kernel: [ 4330.408000] [ide_inb+3/16] ide_inb+0x3/0x10 Jul 9 17:57:07 hanhi kernel: [ 4330.408000] [ide_wait_stat+240/320] ide_wait_stat+0xf0/0x140 Jul 9 17:57:07 hanhi kernel: [ 4330.408000] [ide_do_request+769/2528] ide_do_request+0x301/0x9e0 Jul 9 17:57:07 hanhi kernel: [ 4330.408000] [unmask_IO_APIC_irq+31/64] unmask_IO_APIC_irq+0x1f/0x40 Jul 9 17:57:07 hanhi kernel: [ 4330.408000] [default_enable+18/32] default_enable+0x12/0x20 Jul 9 17:57:07 hanhi kernel: [ 4330.408000] [check_irq_resend+29/112] check_irq_resend+0x1d/0x70 Jul 9 17:57:07 hanhi kernel: [ 4330.408000] [enable_irq+197/208] enable_irq+0xc5/0xd0 Jul 9 17:57:07 hanhi kernel: [ 4330.408000] [__ide_dma_end+91/144] __ide_dma_end+0x5b/0x90 Jul 9 17:57:07 hanhi kernel: [ 4330.408000] [__ide_dma_host_off+71/96] __ide_dma_host_off+0x47/0x60 Jul 9 17:57:07 hanhi kernel: [ 4330.408000] [ide_timer_expiry+201/704] ide_timer_expiry+0xc9/0x2c0 Jul 9 17:57:07 hanhi kernel: [ 4330.408000] [ide_timer_expiry+0/704] ide_timer_expiry+0x0/0x2c0 Jul 9 17:57:07 hanhi kernel: [ 4330.408000] [run_timer_softirq+303/416] run_timer_softirq+0x12f/0x1a0 Jul 9 17:57:07 hanhi kernel: [ 4330.408000] [timer_interrupt+89/176] timer_interrupt+0x59/0xb0 Jul 9 17:57:07 hanhi kernel: [ 4330.408000] [__do_softirq+130/256] __do_softirq+0x82/0x100 Jul 9 17:57:07 hanhi kernel: [ 4330.408000] [do_softirq+85/96] do_softirq+0x55/0x60 Jul 9 17:57:07 hanhi kernel: [ 4330.408000] [smp_apic_timer_interrupt+117/128] smp_apic_timer_interrupt+0x75/0x80 Jul 9 17:57:07 hanhi kernel: [ 4330.408000] [apic_timer_interrupt+40/48] apic_timer_interrupt+0x28/0x30 Jul 9 17:57:07 hanhi kernel: [ 4330.408000] [default_idle+0/96] default_idle+0x0/0x60 Jul 9 17:57:07 hanhi kernel: [ 4330.408000] [native_safe_halt+2/16] native_safe_halt+0x2/0x10 Jul 9 17:57:07 hanhi kernel: [ 4330.408000] [default_idle+61/96] default_idle+0x3d/0x60 Jul 9 17:57:07 hanhi kernel: [ 4330.408000] [cpu_idle+73/208] cpu_idle+0x49/0xd0 Jul 9 17:57:07 hanhi kernel: [ 4330.408000] [start_kernel+869/1056] start_kernel+0x365/0x420 Jul 9 17:57:07 hanhi kernel: [ 4330.408000] [unknown_bootoption+0/608] unknown_bootoption+0x0/0x260 Jul 9 17:57:07 hanhi kernel: [ 4330.408000] ======================= Jul 9 17:57:08 hanhi kernel: [ 4330.676000] hdd: status timeout: status=0xd0 { Busy } Jul 9 17:57:08 hanhi kernel: [ 4330.676000] ide: failed opcode was: unknown Jul 9 17:57:08 hanhi kernel: [ 4330.676000] hdd: drive not ready for command Jul 9 17:57:13 hanhi kernel: [ 4335.680000] hdd: status timeout: status=0xd0 { Busy } Jul 9 17:57:13 hanhi kernel: [ 4335.680000] ide: failed opcode was: unknown Jul 9 17:57:13 hanhi kernel: [ 4335.680000] hdd: drive not ready for command Jul 9 17:57:18 hanhi kernel: [ 4340.684000] hdd: status timeout: status=0xd0 { Busy } Jul 9 17:57:18 hanhi kernel: [ 4340.684000] ide: failed opcode was: unknown Jul 9 17:57:18 hanhi kernel: [ 4340.684000] hdd: drive not ready for command Jul 9 17:57:23 hanhi kernel: [ 4345.688000] hdd: status timeout: status=0xd0 { Busy } Jul 9 17:57:23 hanhi kernel: [ 4345.688000] ide: failed opcode was: unknown Jul 9 17:57:23 hanhi kernel: [ 4345.688000] hdd: drive not ready for command Jul 9 17:57:28 hanhi kernel: [ 4350.692000] hdd: status timeout: status=0xd0 { Busy } Jul 9 17:57:28 hanhi kernel: [ 4350.692000] ide: failed opcode was: unknown Jul 9 17:57:28 hanhi kernel: [ 4350.692000] hdd: drive not ready for command Jul 9 17:57:33 hanhi kernel: [ 4355.696000] hdd: status timeout: status=0xd0 { Busy } Jul 9 17:57:33 hanhi kernel: [ 4355.696000] ide: failed opcode was: unknown Jul 9 17:57:33 hanhi kernel: [ 4355.696000] hdd: drive not ready for command Jul 9 17:57:38 hanhi kernel: [ 4360.700000] hdd: status timeout: status=0xd0 { Busy } Jul 9 17:57:38 hanhi kernel: [ 4360.700000] ide: failed opcode was: unknown Jul 9 17:57:38 hanhi kernel: [ 4360.700000] hdd: drive not ready for command Jul 9 17:57:43 hanhi kernel: [ 4365.704000] hdd: status timeout: status=0xd0 { Busy } Jul 9 17:57:43 hanhi kernel: [ 4365.704000] ide: failed opcode was: unknown Jul 9 17:57:43 hanhi kernel: [ 4365.704000] hdd: drive not ready for command Jul 9 17:57:48 hanhi kernel: [ 4370.708000] hdd: status timeout: status=0xd0 { Busy } Jul 9 17:57:48 hanhi kernel: [ 4370.708000] ide: failed opcode was: unknown Jul 9 17:57:48 hanhi kernel: [ 4370.708000] hdd: drive not ready for command Jul 9 17:57:53 hanhi kernel: [ 4375.712000] hdd: status timeout: status=0xd0 { Busy } Jul 9 17:57:53 hanhi kernel: [ 4375.712000] ide: failed opcode was: unknown Jul 9 17:57:53 hanhi kernel: [ 4375.712000] hdd: drive not ready for command Jul 9 17:57:58 hanhi kernel: [ 4380.716000] hdd: status timeout: status=0xd0 { Busy } Jul 9 17:57:58 hanhi kernel: [ 4380.716000] ide: failed opcode was: unknown Jul 9 17:57:58 hanhi kernel: [ 4380.716000] hdd: drive not ready for command Jul 9 17:58:03 hanhi kernel: [ 4385.720000] hdd: status timeout: status=0xd0 { Busy } Jul 9 17:58:03 hanhi kernel: [ 4385.720000] ide: failed opcode was: unknown Jul 9 17:58:03 hanhi kernel: [ 4385.720000] hdd: drive not ready for command Jul 9 17:58:08 hanhi kernel: [ 4390.724000] hdd: status timeout: status=0xd0 { Busy } Jul 9 17:58:08 hanhi kernel: [ 4390.724000] ide: failed opcode was: unknown Jul 9 17:58:08 hanhi kernel: [ 4390.724000] hdd: drive not ready for command Jul 9 17:58:13 hanhi kernel: [ 4395.728000] hdd: status timeout: status=0xd0 { Busy } Jul 9 17:58:13 hanhi kernel: [ 4395.728000] ide: failed opcode was: unknown Jul 9 17:58:13 hanhi kernel: [ 4395.728000] hdd: drive not ready for command Jul 9 17:58:18 hanhi kernel: [ 4400.732000] hdd: status timeout: status=0xd0 { Busy } ... Jul 9 18:01:03 hanhi kernel: [ 4565.864000] hdd: drive not ready for command Jul 9 18:01:08 hanhi kernel: [ 4570.868000] hdd: status timeout: status=0xd0 { Busy } Jul 9 18:01:08 hanhi kernel: [ 4570.868000] ide: failed opcode was: unknown Jul 9 18:01:08 hanhi kernel: [ 4570.868000] hdd: drive not ready for command Jul 9 18:01:13 hanhi kernel: [ 4575.872000] hdd: status timeout: status=0xd0 { Busy } Jul 9 18:01:13 hanhi kernel: [ 4575.872000] ide: failed opcode was: unknown Jul 9 18:01:13 hanhi kernel: [ 4575.872000] hdd: drive not ready for command Jul 9 18:01:18 hanhi kernel: [ 4580.876000] hdd: status timeout: status=0xd0 { Busy } Jul 9 18:01:18 hanhi kernel: [ 4580.876000] ide: failed opcode was: unknown Jul 9 18:01:18 hanhi kernel: [ 4580.876000] hdd: drive not ready for command Jul 9 18:01:23 hanhi kernel: [ 4585.880000] hdd: status timeout: status=0xd0 { Busy } Jul 9 18:01:23 hanhi kernel: [ 4585.880000] ide: failed opcode was: unknown Jul 9 18:01:23 hanhi kernel: [ 4585.880000] hdd: drive not ready for command Jul 9 18:01:28 hanhi kernel: [ 4590.884000] hdd: status timeout: status=0xd0 { Busy } Jul 9 18:01:28 hanhi kernel: [ 4590.884000] ide: failed opcode was: unknown Jul 9 18:01:28 hanhi kernel: [ 4590.884000] hdd: drive not ready for command Jul 9 18:03:42 hanhi kernel: Inspecting /boot/System.map-2.6.20-16-generic