Bug 32522

After some suspend/resume cycles on my Samsung N210 netbook with Atom N450 CPU, graphics become very slow/unusable, and my dmesg is full om errors like this:

[43373.908075] [drm:i915_hangcheck_ring_idle] *ERROR* Hangcheck timer elapsed... render ring idle [waiting on 222265, at 222266], missed IRQ?
[43375.476057] [drm:i915_hangcheck_ring_idle] *ERROR* Hangcheck timer elapsed... render ring idle [waiting on 222400, at 222411], missed IRQ?
[43377.232050] [drm:i915_hangcheck_ring_idle] *ERROR* Hangcheck timer elapsed... render ring idle [waiting on 222624, at 222624], missed IRQ?
[43378.760071] [drm:i915_hangcheck_ring_idle] *ERROR* Hangcheck timer elapsed... render ring idle [waiting on 222655, at 222657], missed IRQ?
[43380.416061] [drm:i915_hangcheck_ring_idle] *ERROR* Hangcheck timer elapsed... render ring idle [waiting on 222835, at 222837], missed IRQ?

00:02.1 Display controller [0380]: Intel Corporation N10 Family Integrated Graphics Controller [8086:a012]

I'm running Debian testing/unstable with:
Linux netbook 2.6.38-2-amd64 #1 SMP Tue Mar 29 16:45:36 UTC 2011 x86_64 GNU/Linux
(2.6.38.2 based kernel, also happened with 2.6.38.0 kernel but dit not happen with 2.6.37).

ii  libdrm-intel1                                2.4.23-3                          Userspace interface to intel-specific kernel DRM services -- runtime
ii  libdrm-nouveau1a                             2.4.23-3                          Userspace interface to nouveau-specific kernel DRM services -- runtime
ii  libdrm-radeon1                               2.4.23-0.0                        Userspace interface to radeon-specific kernel DRM services -- runtime
ii  libdrm2                                      2.4.23-0.0                        Userspace interface to kernel DRM services -- runtime
ii  libegl1-mesa                                 7.10-4                            A free implementation of the EGL API -- runtime
ii  libgl1-mesa-dri                              7.10-4                            A free implementation of the OpenGL API -- DRI modules
ii  libgl1-mesa-glx                              7.10-4                            A free implementation of the OpenGL API -- GLX runtime
ii  libglu1-mesa                                 7.10-4                            The OpenGL utility library (GLU)
ii  mesa-utils                                   8.0.1-2                           Miscellaneous Mesa GL utilities
ii  xserver-xorg                                 1:7.5+8                           the X.Org X server
ii  xserver-xorg-core                            2:1.9.5-1                         Xorg X server - core server
ii  xserver-xorg-input-all                       1:7.5+8                           the X.Org X server -- input driver metapackage
ii  xserver-xorg-input-evdev                     1:2.6.0-2                         X.Org X server -- evdev input driver
ii  xserver-xorg-input-synaptics                 1.4.0-1                           Synaptics TouchPad driver for X.Org server
ii  xserver-xorg-input-wacom                     0.10.10+20110203-1                X.Org X server -- Wacom input driver
ii  xserver-xorg-video-all                       1:7.6+5                           the X.Org X server -- output driver metapackage
ii  xserver-xorg-video-apm                       1:1.2.3-2                         X.Org X server -- APM display driver
ii  xserver-xorg-video-ark                       1:0.7.3-2                         X.Org X server -- ark display driver
ii  xserver-xorg-video-ati                       1:6.14.0-1                        X.Org X server -- AMD/ATI display driver wrapper
ii  xserver-xorg-video-chips                     1:1.2.4-1                         X.Org X server -- Chips display driver
ii  xserver-xorg-video-cirrus                    1:1.3.2-4                         X.Org X server -- Cirrus display driver
ii  xserver-xorg-video-fbdev                     1:0.4.2-4                         X.Org X server -- fbdev display driver
ii  xserver-xorg-video-i128                      1:1.3.4-2                         X.Org X server -- i128 display driver
ii  xserver-xorg-video-intel                     2:2.14.0-4                        X.Org X server -- Intel i8xx, i9xx display driver
ii  xserver-xorg-video-mach64                    6.8.2-5                           X.Org X server -- ATI Mach64 display driver
ii  xserver-xorg-video-mga                       1:1.4.13.dfsg-3                   X.Org X server -- MGA display driver
ii  xserver-xorg-video-neomagic                  1:1.2.5-2                         X.Org X server -- Neomagic display driver
ii  xserver-xorg-video-nouveau                   1:0.0.16+git20101210+8bb8231-2    X.Org X server -- Nouveau display driver (experimental)
ii  xserver-xorg-video-openchrome                1:0.2.904+svn918-1                X.Org X server -- VIA display driver
ii  xserver-xorg-video-r128                      6.8.1-5                           X.Org X server -- ATI r128 display driver
ii  xserver-xorg-video-radeon                    1:6.14.0-1                        X.Org X server -- AMD/ATI Radeon display driver
ii  xserver-xorg-video-rendition                 1:4.2.4-2                         X.Org X server -- Rendition display driver
ii  xserver-xorg-video-s3                        1:0.6.3-4                         X.Org X server -- legacy S3 display driver
ii  xserver-xorg-video-s3virge                   1:1.10.4-4                        X.Org X server -- S3 ViRGE display driver
ii  xserver-xorg-video-savage                    1:2.3.2-3                         X.Org X server -- Savage display driver
ii  xserver-xorg-video-siliconmotion             1:1.7.5-1                         X.Org X server -- SiliconMotion display driver
ii  xserver-xorg-video-sis                       1:0.10.3-3                        X.Org X server -- SiS display driver
ii  xserver-xorg-video-sisusb                    1:0.9.4-2                         X.Org X server -- SiS USB display driver
ii  xserver-xorg-video-tdfx                      1:1.4.3-4                         X.Org X server -- tdfx display driver
ii  xserver-xorg-video-trident                   1:1.3.4-2                         X.Org X server -- Trident display driver
ii  xserver-xorg-video-tseng                     1:1.2.4-2                         X.Org X server -- Tseng display driver
ii  xserver-xorg-video-vesa                      1:2.3.0-5                         X.Org X server -- VESA display driver
ii  xserver-xorg-video-vmware                    1:11.0.3-2                        X.Org X server -- VMware display driver
ii  xserver-xorg-video-voodoo                    1:1.2.4-2                         X.Org X server -- Voodoo display driver