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Date: Wed, 19 Oct 2011 12:17:16 +0100 From: Sam Tygier <samtygier@...oo.co.uk> To: linux-kernel@...r.kernel.org Subject: 3.1rc10 null pointer dereference ideapad_backlight_notify_power 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. thanks, sam -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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