I have had the same problem. I am not sure if is related to this bug or is the same. However I am sure it has made lucid unstable on my computer. None of the solutions listed above has worked for me. Sometimes when I'm doing nothing particular in lucid, I get a black screen and the system completely freezes, or it enters an endless loop as if it is about to reboot or shutoff, but never does it. Here's what lspci says, 00:00.0 Host bridge: Intel Corporation 82845G/GL[Brookdale-G]/GE/PE DRAM Controller/Host-Hub Interface (rev 01) 00:02.0 VGA compatible controller: Intel Corporation 82845G/GL[Brookdale-G]/GE Chipset Integrated Graphics Device (rev 01) 00:1d.0 USB Controller: Intel Corporation 82801DB/DBL/DBM (ICH4/ICH4-L/ICH4-M) USB UHCI Controller #1 (rev 01) 00:1d.1 USB Controller: Intel Corporation 82801DB/DBL/DBM (ICH4/ICH4-L/ICH4-M) USB UHCI Controller #2 (rev 01) 00:1d.2 USB Controller: Intel Corporation 82801DB/DBL/DBM (ICH4/ICH4-L/ICH4-M) USB UHCI Controller #3 (rev 01) 00:1d.7 USB Controller: Intel Corporation 82801DB/DBM (ICH4/ICH4-M) USB2 EHCI Controller (rev 01) 00:1e.0 PCI bridge: Intel Corporation 82801 PCI Bridge (rev 81) 00:1f.0 ISA bridge: Intel Corporation 82801DB/DBL (ICH4/ICH4-L) LPC Interface Bridge (rev 01) 00:1f.1 IDE interface: Intel Corporation 82801DB (ICH4) IDE Controller (rev 01) 00:1f.5 Multimedia audio controller: Intel Corporation 82801DB/DBL/DBM (ICH4/ICH4-L/ICH4-M) AC'97 Audio Controller (rev 01) 05:08.0 Ethernet controller: Intel Corporation 82801DB PRO/100 VE (LOM) Ethernet Controller (rev 81) 05:09.0 Communication controller: Conexant Systems, Inc. HSF 56k HSFi Modem (rev 01) Here's what kern.log says, and the same goes for the xorg log (this is the log of the last bug event), May 9 16:54:34 oscar-desktop kernel: [ 418.992019] [drm:i915_hangcheck_elapsed] *ERROR* Hangcheck timer elapsed... GPU hung May 9 16:54:34 oscar-desktop kernel: [ 418.992038] render error detected, EIR: 0x00000000 May 9 16:54:34 oscar-desktop kernel: [ 418.992060] [drm:i915_do_wait_request] *ERROR* i915_do_wait_request returns -5 (awaiting 44302 at 44294) May 9 16:54:37 oscar-desktop kernel: [ 421.888019] [drm:i915_gem_idle] *ERROR* hardware wedged May 9 16:54:43 oscar-desktop kernel: [ 427.915019] [drm:i915_gem_entervt_ioctl] *ERROR* Reenabling wedged hardware, good luck May 9 16:54:43 oscar-desktop kernel: [ 428.248012] [drm:i915_hangcheck_elapsed] *ERROR* Hangcheck timer elapsed... GPU hung May 9 16:54:43 oscar-desktop kernel: [ 428.248022] render error detected, EIR: 0x00000000 May 9 16:54:43 oscar-desktop kernel: [ 428.248921] [drm:i915_do_wait_request] *ERROR* i915_do_wait_request returns -5 (awaiting 44304 at 44294) May 9 16:54:45 oscar-desktop kernel: [ 430.348017] [drm:i915_gem_idle] *ERROR* hardware wedged May 9 16:54:46 oscar-desktop kernel: [ 431.682383] [drm:i915_gem_entervt_ioctl] *ERROR* Reenabling wedged hardware, good luck May 9 16:54:47 oscar-desktop kernel: [ 432.016012] [drm:i915_hangcheck_elapsed] *ERROR* Hangcheck timer elapsed... GPU hung May 9 16:54:47 oscar-desktop kernel: [ 432.016023] render error detected, EIR: 0x00000000 May 9 16:54:47 oscar-desktop kernel: [ 432.016917] [drm:i915_do_wait_request] *ERROR* i915_do_wait_request returns -5 (awaiting 44306 at 44294) May 9 16:54:49 oscar-desktop kernel: [ 434.072017] [drm:i915_gem_idle] *ERROR* hardware wedged May 9 16:54:50 oscar-desktop kernel: [ 435.206266] [drm:i915_gem_entervt_ioctl] *ERROR* Reenabling wedged hardware, good luck May 9 16:54:50 oscar-desktop kernel: [ 435.540012] [drm:i915_hangcheck_elapsed] *ERROR* Hangcheck timer elapsed... GPU hung May 9 16:54:50 oscar-desktop kernel: [ 435.540024] render error detected, EIR: 0x00000000 May 9 16:54:50 oscar-desktop kernel: [ 435.540938] [drm:i915_do_wait_request] *ERROR* i915_do_wait_request returns -5 (awaiting 44308 at 44294) May 9 16:54:52 oscar-desktop kernel: [ 437.604017] [drm:i915_gem_idle] *ERROR* hardware wedged May 9 16:54:54 oscar-desktop kernel: [ 438.938936] [drm:i915_gem_entervt_ioctl] *ERROR* Reenabling wedged hardware, good luck May 9 16:54:54 oscar-desktop kernel: [ 439.272012] [drm:i915_hangcheck_elapsed] *ERROR* Hangcheck timer elapsed... GPU hung May 9 16:54:54 oscar-desktop kernel: [ 439.272023] render error detected, EIR: 0x00000000 May 9 16:54:54 oscar-desktop kernel: [ 439.272921] [drm:i915_do_wait_request] *ERROR* i915_do_wait_request returns -5 (awaiting 44310 at 44294) May 9 16:54:56 oscar-desktop kernel: [ 441.328017] [drm:i915_gem_idle] *ERROR* hardware wedged May 9 16:54:57 oscar-desktop kernel: [ 442.657953] [drm:i915_gem_entervt_ioctl] *ERROR* Reenabling wedged hardware, good luck May 9 16:54:58 oscar-desktop kernel: [ 442.992012] [drm:i915_hangcheck_elapsed] *ERROR* Hangcheck timer elapsed... GPU hung May 9 16:54:58 oscar-desktop kernel: [ 442.992023] render error detected, EIR: 0x00000000 May 9 16:54:58 oscar-desktop kernel: [ 442.992931] [drm:i915_do_wait_request] *ERROR* i915_do_wait_request returns -5 (awaiting 44312 at 44294) May 9 16:55:00 oscar-desktop kernel: [ 445.048018] [drm:i915_gem_idle] *ERROR* hardware wedged May 9 16:55:01 oscar-desktop kernel: [ 446.381567] [drm:i915_gem_entervt_ioctl] *ERROR* Reenabling wedged hardware, good luck May 9 16:55:01 oscar-desktop kernel: [ 446.716012] [drm:i915_hangcheck_elapsed] *ERROR* Hangcheck timer elapsed... GPU hung May 9 16:55:01 oscar-desktop kernel: [ 446.716024] render error detected, EIR: 0x00000000 May 9 16:55:01 oscar-desktop kernel: [ 446.716929] [drm:i915_do_wait_request] *ERROR* i915_do_wait_request returns -5 (awaiting 44314 at 44294) May 9 16:55:04 oscar-desktop kernel: [ 448.772017] [drm:i915_gem_idle] *ERROR* hardware wedged May 9 16:55:05 oscar-desktop kernel: [ 450.105272] [drm:i915_gem_entervt_ioctl] *ERROR* Reenabling wedged hardware, good luck May 9 16:55:05 oscar-desktop kernel: [ 450.436012] [drm:i915_hangcheck_elapsed] *ERROR* Hangcheck timer elapsed... GPU hung May 9 16:55:05 oscar-desktop kernel: [ 450.436023] render error detected, EIR: 0x00000000 May 9 16:55:05 oscar-desktop kernel: [ 450.436948] [drm:i915_do_wait_request] *ERROR* i915_do_wait_request returns -5 (awaiting 44316 at 44294) May 9 16:55:07 oscar-desktop kernel: [ 452.492017] [drm:i915_gem_idle] *ERROR* hardware wedged May 9 16:55:08 oscar-desktop kernel: [ 453.628968] [drm:i915_gem_entervt_ioctl] *ERROR* Reenabling wedged hardware, good luck May 9 16:55:09 oscar-desktop kernel: [ 453.960012] [drm:i915_hangcheck_elapsed] *ERROR* Hangcheck timer elapsed... GPU hung May 9 16:55:09 oscar-desktop kernel: [ 453.960024] render error detected, EIR: 0x00000000 May 9 16:55:09 oscar-desktop kernel: [ 453.960937] [drm:i915_do_wait_request] *ERROR* i915_do_wait_request returns -5 (awaiting 44318 at 44294) May 9 16:55:11 oscar-desktop kernel: [ 456.020016] [drm:i915_gem_idle] *ERROR* hardware wedged May 9 16:55:12 oscar-desktop kernel: [ 457.352666] [drm:i915_gem_entervt_ioctl] *ERROR* Reenabling wedged hardware, good luck May 9 16:55:12 oscar-desktop kernel: [ 457.684012] [drm:i915_hangcheck_elapsed] *ERROR* Hangcheck timer elapsed... GPU hung May 9 16:55:12 oscar-desktop kernel: [ 457.684022] render error detected, EIR: 0x00000000 May 9 16:55:12 oscar-desktop kernel: [ 457.684927] [drm:i915_do_wait_request] *ERROR* i915_do_wait_request returns -5 (awaiting 44320 at 44294) May 9 16:55:14 oscar-desktop kernel: [ 459.744016] [drm:i915_gem_idle] *ERROR* hardware wedged May 9 16:55:16 oscar-desktop kernel: [ 460.881743] [drm:i915_gem_entervt_ioctl] *ERROR* Reenabling wedged hardware, good luck May 9 16:55:16 oscar-desktop kernel: [ 461.216011] [drm:i915_hangcheck_elapsed] *ERROR* Hangcheck timer elapsed... GPU hung May 9 16:55:16 oscar-desktop kernel: [ 461.216021] render error detected, EIR: 0x00000000 May 9 16:55:16 oscar-desktop kernel: [ 461.216923] [drm:i915_do_wait_request] *ERROR* i915_do_wait_request returns -5 (awaiting 44322 at 44294) May 9 16:55:18 oscar-desktop kernel: [ 463.272016] [drm:i915_gem_idle] *ERROR* hardware wedged May 9 16:55:19 oscar-desktop kernel: [ 464.408768] [drm:i915_gem_entervt_ioctl] *ERROR* Reenabling wedged hardware, good luck May 9 16:55:19 oscar-desktop kernel: [ 464.740012] [drm:i915_hangcheck_elapsed] *ERROR* Hangcheck timer elapsed... GPU hung May 9 16:55:19 oscar-desktop kernel: [ 464.740021] render error detected, EIR: 0x00000000 May 9 16:55:19 oscar-desktop kernel: [ 464.740914] [drm:i915_do_wait_request] *ERROR* i915_do_wait_request returns -5 (awaiting 44324 at 44294) May 9 16:55:22 oscar-desktop kernel: [ 466.796017] [drm:i915_gem_idle] *ERROR* hardware wedged May 9 16:55:23 oscar-desktop kernel: [ 468.126776] [drm:i915_gem_entervt_ioctl] *ERROR* Reenabling wedged hardware, good luck May 9 16:55:23 oscar-desktop kernel: [ 468.460012] [drm:i915_hangcheck_elapsed] *ERROR* Hangcheck timer elapsed... GPU hung May 9 16:55:23 oscar-desktop kernel: [ 468.460023] render error detected, EIR: 0x00000000 May 9 16:55:23 oscar-desktop kernel: [ 468.460933] [drm:i915_do_wait_request] *ERROR* i915_do_wait_request returns -5 (awaiting 44326 at 44294) May 9 16:55:25 oscar-desktop kernel: [ 470.516020] [drm:i915_gem_idle] *ERROR* hardware wedged May 9 16:55:27 oscar-desktop kernel: [ 471.845688] [drm:i915_gem_entervt_ioctl] *ERROR* Reenabling wedged hardware, good luck May 9 16:55:27 oscar-desktop kernel: [ 472.176011] [drm:i915_hangcheck_elapsed] *ERROR* Hangcheck timer elapsed... GPU hung May 9 16:55:27 oscar-desktop kernel: [ 472.176022] render error detected, EIR: 0x00000000 May 9 16:55:27 oscar-desktop kernel: [ 472.176937] [drm:i915_do_wait_request] *ERROR* i915_do_wait_request returns -5 (awaiting 44328 at 44294) May 9 16:55:29 oscar-desktop kernel: [ 474.232016] [drm:i915_gem_idle] *ERROR* hardware wedged May 9 16:55:30 oscar-desktop kernel: [ 475.565103] [drm:i915_gem_entervt_ioctl] *ERROR* Reenabling wedged hardware, good luck May 9 16:55:31 oscar-desktop kernel: [ 475.896012] [drm:i915_hangcheck_elapsed] *ERROR* Hangcheck timer elapsed... GPU hung May 9 16:55:31 oscar-desktop kernel: [ 475.896023] render error detected, EIR: 0x00000000 May 9 16:55:31 oscar-desktop kernel: [ 475.896927] [drm:i915_do_wait_request] *ERROR* i915_do_wait_request returns -5 (awaiting 44330 at 44294) May 9 16:55:33 oscar-desktop kernel: [ 477.952017] [drm:i915_gem_idle] *ERROR* hardware wedged May 9 16:55:34 oscar-desktop kernel: [ 479.086988] [drm:i915_gem_entervt_ioctl] *ERROR* Reenabling wedged hardware, good luck May 9 16:55:34 oscar-desktop kernel: [ 479.420011] [drm:i915_hangcheck_elapsed] *ERROR* Hangcheck timer elapsed... GPU hung May 9 16:55:34 oscar-desktop kernel: [ 479.420021] render error detected, EIR: 0x00000000 May 9 16:55:34 oscar-desktop kernel: [ 479.420933] [drm:i915_do_wait_request] *ERROR* i915_do_wait_request returns -5 (awaiting 44332 at 44294) May 9 16:55:34 oscar-desktop kernel: [ 479.800063] usb 2-1: USB disconnect, address 2 May 9 16:55:36 oscar-desktop kernel: [ 481.280022] usb 2-1: new low speed USB device using uhci_hcd and address 3 May 9 16:55:36 oscar-desktop kernel: [ 481.454501] usb 2-1: configuration #1 chosen from 1 choice May 9 16:55:36 oscar-desktop kernel: [ 481.480042] [drm:i915_gem_idle] *ERROR* hardware wedged May 9 16:55:36 oscar-desktop kernel: [ 481.536957] input: PIXART USB OPTICAL MOUSE as /devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1:1.0/input/input5 May 9 16:55:36 oscar-desktop kernel: [ 481.537246] generic-usb 0003:093A:2510.0002: input,hidraw0: USB HID v1.11 Mouse [PIXART USB OPTICAL MOUSE] on usb-0000:00:1d.0-1/input0 May 9 16:55:38 oscar-desktop kernel: [ 482.866154] [drm:i915_gem_entervt_ioctl] *ERROR* Reenabling wedged hardware, good luck May 9 16:55:38 oscar-desktop kernel: [ 483.200012] [drm:i915_hangcheck_elapsed] *ERROR* Hangcheck timer elapsed... GPU hung May 9 16:55:38 oscar-desktop kernel: [ 483.200022] render error detected, EIR: 0x00000000 May 9 16:55:38 oscar-desktop kernel: [ 483.200945] [drm:i915_do_wait_request] *ERROR* i915_do_wait_request returns -5 (awaiting 44334 at 44294) May 9 16:55:40 oscar-desktop kernel: [ 485.256027] [drm:i915_gem_idle] *ERROR* hardware wedged May 9 16:55:41 oscar-desktop kernel: [ 486.586990] [drm:i915_gem_entervt_ioctl] *ERROR* Reenabling wedged hardware, good luck May 9 16:55:42 oscar-desktop kernel: [ 486.920012] [drm:i915_hangcheck_elapsed] *ERROR* Hangcheck timer elapsed... GPU hung May 9 16:55:42 oscar-desktop kernel: [ 486.920022] render error detected, EIR: 0x00000000 May 9 16:55:42 oscar-desktop kernel: [ 486.920949] [drm:i915_do_wait_request] *ERROR* i915_do_wait_request returns -5 (awaiting 44336 at 44294) May 9 16:55:44 oscar-desktop kernel: [ 488.980015] [drm:i915_gem_idle] *ERROR* hardware wedged May 9 16:55:45 oscar-desktop kernel: [ 490.311654] [drm:i915_gem_entervt_ioctl] *ERROR* Reenabling wedged hardware, good luck May 9 16:55:45 oscar-desktop kernel: [ 490.648010] [drm:i915_hangcheck_elapsed] *ERROR* Hangcheck timer elapsed... GPU hung May 9 16:55:45 oscar-desktop kernel: [ 490.648021] render error detected, EIR: 0x00000000 May 9 16:55:45 oscar-desktop kernel: [ 490.648928] [drm:i915_do_wait_request] *ERROR* i915_do_wait_request returns -5 (awaiting 44338 at 44294) May 9 16:55:47 oscar-desktop kernel: [ 492.708015] [drm:i915_gem_idle] *ERROR* hardware wedged May 9 16:55:49 oscar-desktop kernel: [ 493.846743] [drm:i915_gem_entervt_ioctl] *ERROR* Reenabling wedged hardware, good luck May 9 16:55:49 oscar-desktop kernel: [ 494.180012] [drm:i915_hangcheck_elapsed] *ERROR* Hangcheck timer elapsed... GPU hung May 9 16:55:49 oscar-desktop kernel: [ 494.180022] render error detected, EIR: 0x00000000 May 9 16:55:49 oscar-desktop kernel: [ 494.180928] [drm:i915_do_wait_request] *ERROR* i915_do_wait_request returns -5 (awaiting 44340 at 44294) May 9 16:55:51 oscar-desktop kernel: [ 496.240016] [drm:i915_gem_idle] *ERROR* hardware wedged May 9 16:55:52 oscar-desktop kernel: [ 497.569971] [drm:i915_gem_entervt_ioctl] *ERROR* Reenabling wedged hardware, good luck May 9 16:55:53 oscar-desktop kernel: [ 497.904012] [drm:i915_hangcheck_elapsed] *ERROR* Hangcheck timer elapsed... GPU hung May 9 16:55:53 oscar-desktop kernel: [ 497.904021] render error detected, EIR: 0x00000000 May 9 16:55:53 oscar-desktop kernel: [ 497.904942] [drm:i915_do_wait_request] *ERROR* i915_do_wait_request returns -5 (awaiting 44342 at 44294) May 9 16:55:55 oscar-desktop kernel: [ 499.960019] [drm:i915_gem_idle] *ERROR* hardware wedged May 9 16:55:56 oscar-desktop kernel: [ 501.290520] [drm:i915_gem_entervt_ioctl] *ERROR* Reenabling wedged hardware, good luck May 9 16:55:56 oscar-desktop kernel: [ 501.628009] [drm:i915_hangcheck_elapsed] *ERROR* Hangcheck timer elapsed... GPU hung May 9 16:55:56 oscar-desktop kernel: [ 501.628020] render error detected, EIR: 0x00000000 May 9 16:55:56 oscar-desktop kernel: [ 501.628939] [drm:i915_do_wait_request] *ERROR* i915_do_wait_request returns -5 (awaiting 44344 at 44294) May 9 16:55:58 oscar-desktop kernel: [ 503.684016] [drm:i915_gem_idle] *ERROR* hardware wedged May 9 16:55:59 oscar-desktop kernel: Kernel logging (proc) stopped. May 9 16:56:37 oscar-desktop kernel: imklog 4.2.0, log source = /proc/kmsg started. I hope you can give a solution to this bug, because it has made the use of ubuntu lucid very annoying. Thanks.