https://bugzilla.kernel.org/show_bug.cgi?id=42726
Summary: Software backlight controls don't work
Product: ACPI
Version: 2.5
Kernel Version: 3.1.10
Platform: All
OS/Version: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: Power-Video
AssignedTo: acpi_power-vi...@kernel-bugs.osdl.org
ReportedBy: kel...@inbox.lv
Regression: No
Created an attachment (id=72276)
--> (https://bugzilla.kernel.org/attachment.cgi?id=72276)
Dmesg boot output.
I have 2 laptops Emachine e725 and e525 , both with Intel Corporation Mobile 4
Series Chipset Integrated Graphics Controller using i915 with kernel
modsetting.
After the kernel has loaded the i915 driver on both laptops, the backlight
turns off.
There are 2 ways to get it back: 1st is to use brightness control keys (Turn
the backlight 1 step down and then 1 step up) on keyboard which only work if
there is an acpi_osi="Linux" option in the boot parammetrs, the second is using
setpci -s 00:02.0 F4.B=00. The backlight turns off too when a switch between
tty7 and tty8 happens (if xorg is running on both).
Attached dmesg output on boot and lspci -v
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