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    Subject[REGRESSION, i915]: Periodic stalls with 2.6.36-rc2

    With 2.6.36-rc2 I see periodic stalls when running with a stock Ubuntu
    10.04 userspace. These stalls were not present in 2.6.36-rc1 on an EeePC
    900 with an i915.

    Attempts to bisect the issue are not successful - most kernels in
    between rc1 and rc2 just make the system come up with a black screen
    which takes minutes between showing messages (rather than finishing in
    two seconds). bc584c5107bfd97e2aa41c798e3b213bcdd4eae7 seems to be good
    but 45d7f32c7a43cbb9592886d38190e379e2eb2226 is not.

    Warnings like:

    [ 64.227046] [drm:intel_calculate_wm] *ERROR* Insufficient FIFO for plane, expect flickering: entries required = 36, available = 31.
    [ 82.953011] [drm:i915_hangcheck_elapsed] *ERROR* Hangcheck timer elapsed... GPU idle, missed IRQ.

    appear frequently in the dmesg and the stalls are most visible when
    playing fullscreen video. The first warning message (Insufficient
    FIFO...) is present in 2.6.36-rc1 but not 2.6.35.

    One additional quirk is that a more recent X userspace
    2:2.12.0+git20100810.19c48d3b-0ubuntu0sarvatt2~lucid, libdrm-intel1
    xorg 1:7.5+6ubuntu1) now has major tearing (when watching video) and
    refresh (in general at least when using compiz) issues which were not
    seen with 2.6.36-rc1.

    Sitsofe |

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