https://bugzilla.kernel.org/show_bug.cgi?id=41042
Summary: Changing the backlight brightness may freeze the
laptop
Product: ACPI
Version: 2.5
Kernel Version: 3.0.0
Platform: All
OS/Version: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: Other
AssignedTo: acpi_ot...@kernel-bugs.osdl.org
ReportedBy: joalon...@gmail.com
Regression: No
Created an attachment (id=68732)
--> (https://bugzilla.kernel.org/attachment.cgi?id=68732)
acpidump
Sometimes when pressing the keys to adjust screen brightness, the laptop
freezes.
The script below reproduces the freeze:
for (( i=1 ; i <= 100 ; i++))
do
echo 3 >/sys/class/backlight/acpi_video0/brightness
done
The screen shows the last image, no disk/net/keyboard activity, and the
processor cooler increases the air flow indicating a heavy usage of CPU
(interrupt ??, spinlock ??)
I tested with kernel version 3.0.0, 2.6.38 and fedora 15 kernels.
laptop: Dell Inspiron, i5, intel graphics
follow acpidump and lspci -vxxx
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