From: Sam Tygier <samtygier@yahoo.co.uk>
To: linux-kernel@vger.kernel.org
Subject: 3.1rc10 null pointer dereference ideapad_backlight_notify_power
Date: Wed, 19 Oct 2011 12:17:16 +0100 [thread overview]
Message-ID: <4E9EB1BC.9020709@yahoo.co.uk> (raw)
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
next reply other threads:[~2011-10-19 11:17 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-10-19 11:17 Sam Tygier [this message]
2011-10-19 20:20 ` 3.1rc10 null pointer dereference ideapad_backlight_notify_power David Rientjes
2011-10-20 1:32 ` Ike Panhc
2011-10-20 5:35 ` David Rientjes
2011-10-24 21:51 ` Sam Tygier
2011-10-24 23:12 ` David Rientjes
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