tags 655377 + patch moreinfo quit Jonathan Nieder wrote: > Artem X wrote:
>> Hello, there's patch available to fix the kernel panic when 'turning >> off screen backlight' >> which me and other people experienced (on various distros including >> debian testing on lenovo). > > Might be fixed by v3.2-rc1~111^2~22 (ideapad: Check if acpi already > handle backlight power to avoid a page fault, 2011-10-23). Could you > try a 3.2.y release candidate from experimental to check? Even better, please try this patch against a 3.1.y kernel.org kernel. Instructions for testing a patched kernel are at [1]. If it works, we can send it to Greg to consider applying to the 3.1.y branch. Luckily the ideapad-laptop backlight driver was only introduced in v3.1-rc1~14^2~29, so older kernels do not have this bug. Many thanks, Jonathan [1] http://kernel-handbook.alioth.debian.org/ch-common-tasks.html#s-kernel-org-package -- >8 -- From: Rene Bollford <xsec...@googlemail.com> Date: Sun, 23 Oct 2011 09:56:42 +0200 Subject: ideapad: Check if acpi already handle backlight power to avoid a page fault commit d4afc7754a60b885b63ef23fd194984e2d53a4e6 upstream. This patch avoid a page fault in the ideapad-laptop extras when turning the backlight power on or off. Signed-off-by: Rene Bolldorf <xsec...@googlemail.com> Signed-off-by: Matthew Garrett <m...@redhat.com> Signed-off-by: Jonathan Nieder <jrnie...@gmail.com> --- drivers/platform/x86/ideapad-laptop.c | 2 ++ 1 files changed, 2 insertions(+), 0 deletions(-) diff --git a/drivers/platform/x86/ideapad-laptop.c b/drivers/platform/x86/ideapad-laptop.c index 0c595410e788..0d94eec00f4d 100644 --- a/drivers/platform/x86/ideapad-laptop.c +++ b/drivers/platform/x86/ideapad-laptop.c @@ -493,6 +493,8 @@ static void ideapad_backlight_notify_power(struct ideapad_private *priv) unsigned long power; struct backlight_device *blightdev = priv->blightdev; + if (!blightdev) + return; if (read_ec_data(ideapad_handle, 0x18, &power)) return; blightdev->props.power = power ? FB_BLANK_UNBLANK : FB_BLANK_POWERDOWN; -- 1.7.8.3 -- To UNSUBSCRIBE, email to debian-kernel-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org Archive: http://lists.debian.org/20120110201508.GG22184@burratino
