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 ls -1 /sys/class/backlight/ acpi_video0 intel_backlight When in X mode, turn on backlight debug message by: # cd /sys/kernel/debug/dynamic_debug # echo 'module backlight +pft' > control # dmesg [ 179.294484] [3209] brightness_store: backlight: set brightness to 0 [ 179.606036] [3209] brightness_store: backlight: set brightness to 15 [ 183.627956] [3209] brightness_store: backlight: set brightness to 15 ps aux | grep 3209 root 3098 0.0 0.0 12380 2260 pts/0 S+ 15:51 0:00 grep --colour=auto 3209 root 3209 1.1 0.8 228012 33208 tty7 Ssl+ 15:30 0:15 /usr/bin/X -nolisten tcp -br -deferglyphs 16 vt07 -auth /var/run/slim.auth initial workup done at https://bugzilla.kernel.org/show_bug.cgi?id=79541
x11-base/xorg-server-1.15.99.903 sys-kernel/gentoo-sources-3.15.3
I'm having the same issue, except that the screen stays dark after going back to X, as well as after resuming from suspend. I'm running Arch Linux with a hybrid graphics setup using the open source intel and radeon drivers. I have three interfaces in /sys/class/backlight. $ ls /sys/class/backlight acpi_video0 acpi_video1 intel_backlight The issue appeared when upgrading xf86-video-intel from version 2.9.11 to 2.9.12.
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