https://bugzilla.kernel.org/show_bug.cgi?id=79541
Bug ID: 79541
Summary: backlight in console changes to minimum when switching
from xorg to console
Product: ACPI
Version: 2.5
Kernel Version: 3.15.3-gentoo.2014-07-05_13-00
Hardware: x86-64
OS: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: Power-Video
Assignee: [email protected]
Reporter: [email protected]
Regression: No
After updating kernel to 3.15.x backlight in console changes to minimum when
switching from xorg to console.
But when switching back from console to xorg, brightness goes back to max as it
was before switching.
Initial boot keeps maximum brightness in console through the boot process.
Fn+brightness keys (ThinkPad T410) are functional to increase and decrease
brightness, both in console and in xorg.
kernel commandline "acpi_backlight=vendor" keeps brightness level the same in
console and in xorg, but disable brightness buttons (Fn+Home and Fn+End in my
case).
zcat /proc/config.gz | grep -i think
CONFIG_THINKPAD_ACPI=m
CONFIG_THINKPAD_ACPI_ALSA_SUPPORT=y
# CONFIG_THINKPAD_ACPI_DEBUGFACILITIES is not set
# CONFIG_THINKPAD_ACPI_DEBUG is not set
CONFIG_THINKPAD_ACPI_UNSAFE_LEDS=y
CONFIG_THINKPAD_ACPI_VIDEO=y
CONFIG_THINKPAD_ACPI_HOTKEY_POLL=y
$ zgrep -i fb_backlight /proc/config.gz
# CONFIG_FB_BACKLIGHT is not set
# lsmod | grep think
thinkpad_ec 3503 2 hdaps,tp_smapi
thinkpad_acpi 53325 0
# lsof -r1 /sys/class/backlight/acpi_video0/
# lsof -r1 /sys/class/backlight/intel_backlight/
# auditctl -w /sys/class/backlight/acpi_video0/ -p war -k blwatch
# auditctl -w /sys/class/backlight/intel_backlight/ -p war -k blwatch
could not not pinpoint the responsible process
I have started a discussion on http://forums.gentoo.org/viewtopic-t-993600.html
and was advised to file a bug report.
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