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    Subject[BISECTED] drm: random hang since 620f378 "drm: prune modes when ..."
    After upgrading one of my machines to 2.6.32, I saw hangs after one to thirty minutes after
    booting, with random data written to parts of the frame buffer. I've bisected it down
    to 620f37811d "drm: prune modes when output is disconnected.", which was merged
    in 2.6.32-rc1. Connecting a serial console does not reveal any output at the time of
    the crash.

    The machine uses an Intel G45 chipset with the i915 kernel mode setting enabled.

    I have no clue what that patch does or why reverting it fixes the problem but 2.6.32
    with this revert applied has not shown these hangs yet.

    Signed-off-by: Arnd Bergmann <>


    --- a/drivers/gpu/drm/drm_crtc_helper.c
    +++ b/drivers/gpu/drm/drm_crtc_helper.c
    @@ -104,7 +104,8 @@ int drm_helper_probe_single_connector_modes(struct drm_connector *connector,
    if (connector->status == connector_status_disconnected) {
    DRM_DEBUG_KMS("%s is disconnected\n",
    - goto prune;
    + /* TODO set EDID to NULL */
    + return 0;

    count = (*connector_funcs->get_modes)(connector);
    @@ -132,7 +133,6 @@ int drm_helper_probe_single_connector_modes(struct drm_connector *connector,

    drm_mode_prune_invalid(dev, &connector->modes, true);

    if (list_empty(&connector->modes))

     \ /
      Last update: 2009-12-07 18:33    [W:0.020 / U:1.788 seconds]
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