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    SubjectRe: 3.1rc10 null pointer dereference ideapad_backlight_notify_power
    On 10/20/2011 04:20 AM, David Rientjes wrote:
    > On Wed, 19 Oct 2011, Sam Tygier wrote:
    >
    >> In kernels 3.1rc9 and 3.1rc10 (from the ubuntu mainline repo) I get a crash
    >> when disabling and then enabling the screen backlight with the alt+f2 key on a
    >> lenovo ideapad S12 (intel version). The crash does not occur with 3.0 kernels
    >> in ubuntu. I have not tested earlier 3.1 rcs.
    >>
    >> The crash message scrolls to fast to see, it is not writen to a log, and i
    >> dont see it on a USB serial console (I may be doing something wrong, but I do
    >> see other messages during boot). I managed to get some photos of the message.
    >> interesting parts are:
    >>
    >> BUG: unable to handle kernel NULL pointer dereference at 00000008
    >> IP: [<f807b29e>] ideapad_backlight_notify_power+0x2e/0x40 [ideapad_laptop]
    >> *pde = 00000000
    >> Oops: 0002 [#1] SMP
    >>
    >> call trace functions:
    >> ideapad_acpi_notify
    >> acpi_device_notify
    >> acpi_ev_notify_dispach
    >> acpi_os_execute_deferred
    >> process_one_work
    >> ? acpi_os_wait_events_complete
    >> ????????? can't read this one
    >> kthread
    >> kthread_bind
    >> kernel_thread_helper
    >>
    >> i put the photos at http://www.hep.manchester.ac.uk/u/sam/pub/ideapad/
    >>
    >> if it would be helpfull, i could try a few more times for sharper photos.
    >> please let me know if there is any other useful information you need.
    >>
    >
    > Looks light it may be changed via the acpi video driver where ->blight is
    > NULL. Adding Ike and Matthew to the cc.
    >

    This issue has been reported[1] and patch[2] is ready.

    [1] http://www.mail-archive.com/platform-driver-x86@vger.kernel.org/msg02340.html

    [2] http://www.mail-archive.com/platform-driver-x86@vger.kernel.org/msg02343.html
    http://www.mail-archive.com/platform-driver-x86@vger.kernel.org/msg02346.html

    Thanks for reporting this issue.


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