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I just installed a fresh Natty on my brand new Thinkpad X220. Everything
works quite fine, except for that I'm experiencing "micro hangs" in the
X server: Every few seconds, the system seems to hang for about 0.5-1
seconds, but then resumes normal operation, filling in typed characters
from the buffer or completing the current mouse movement.

Whenever this phenomenon occurs, I get the following line in
/var/log/syslog:

Jun  8 17:36:31 tango kernel: [19380.993923] [drm:i915_hangcheck_ring_idle] *ERROR* Hangcheck timer elapsed... blt ring idle [waiting on 7717165, at 7717165], missed IRQ?
Jun  8 17:36:41 tango kernel: [19390.990968] [drm:i915_hangcheck_ring_idle] *ERROR* Hangcheck timer elapsed... blt ring idle [waiting on 7724235, at 7724235], missed IRQ?
Jun  8 17:36:55 tango kernel: [19404.493498] [drm:i915_hangcheck_ring_idle] *ERROR* Hangcheck timer elapsed... blt ring idle [waiting on 7739750, at 7739750], missed IRQ?
Jun  8 17:36:57 tango kernel: [19406.990282] [drm:i915_hangcheck_ring_idle] *ERROR* Hangcheck timer elapsed... blt ring idle [waiting on 7740994, at 7740994], missed IRQ?
…

The issue occurs through the whole runtime of the system with an interval between 1 and 10 seconds. Hangs are between 0.5 and 2 seconds. Any input that occurs during the hang (typing, mouse movement) is processed as soon as the hang is over. For every hang, I register a log entry as shown above. There are no further log entries in a similar direction.
--- 
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.23.
Architecture: amd64
ArecordDevices:
 **** List of CAPTURE Hardware Devices ****
 card 0: PCH [HDA Intel PCH], device 0: CONEXANT Analog [CONEXANT Analog]
   Subdevices: 1/1
   Subdevice #0: subdevice #0
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC0:  dotxp      2030 F.... pulseaudio
 /dev/snd/pcmC0D0p:   dotxp      2030 F...m pulseaudio
CRDA: Error: [Errno 2] No such file or directory
Card0.Amixer.info:
 Card hw:0 'PCH'/'HDA Intel PCH at 0xd2620000 irq 48'
   Mixer name	: 'Intel CougarPoint HDMI'
   Components	: 'HDA:14f1506e,17aa21da,00100000 HDA:80862805,80860101,00100000'
   Controls      : 20
   Simple ctrls  : 8
Card29.Amixer.info:
 Card hw:29 'ThinkPadEC'/'ThinkPad Console Audio Control at EC reg 0x30, fw unknown'
   Mixer name	: 'ThinkPad EC (unknown)'
   Components	: ''
   Controls      : 1
   Simple ctrls  : 1
Card29.Amixer.values:
 Simple mixer control 'Console',0
   Capabilities: pswitch pswitch-joined penum
   Playback channels: Mono
   Mono: Playback [on]
DistroRelease: Ubuntu 11.04
EcryptfsInUse: Yes
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release amd64 (20110427.1)
MachineType: LENOVO 4287CTO
Package: linux (not installed)
ProcEnviron:
 LANGUAGE=en_US:en
 PATH=(custom, user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.38-8-generic root=UUID=a75d277a-fe48-407e-8aeb-9459042f48c5 ro quiet splash vt.handoff=7
ProcVersionSignature: Ubuntu 2.6.38-8.42-generic 2.6.38.2
RelatedPackageVersions:
 linux-restricted-modules-2.6.38-8-generic N/A
 linux-backports-modules-2.6.38-8-generic  N/A
 linux-firmware                            1.52
Tags:  natty running-unity
Uname: Linux 2.6.38-8-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare
dmi.bios.date: 04/01/2011
dmi.bios.vendor: LENOVO
dmi.bios.version: 8DET42WW (1.12 )
dmi.board.asset.tag: Not Available
dmi.board.name: 4287CTO
dmi.board.vendor: LENOVO
dmi.board.version: Not Available
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Not Available
dmi.modalias: dmi:bvnLENOVO:bvr8DET42WW(1.12):bd04/01/2011:svnLENOVO:pn4287CTO:pvrThinkPadX220:rvnLENOVO:rn4287CTO:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
dmi.product.name: 4287CTO
dmi.product.version: ThinkPad X220
dmi.sys.vendor: LENOVO

** Affects: xserver-xorg-video-intel (Ubuntu)
     Importance: Undecided
         Status: Confirmed


** Tags: apport-collected natty running-unity
-- 
Microhangs of Xorg: drm:i915_hangcheck_ring_idle
https://bugs.launchpad.net/bugs/794658
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