I finally understand what is going on. The kernel stuffs the keystrokes into the keyboard controller to change the brightness. I have not found this in the kernel source, but putting various numbers to /sys/devices/virtual/backlight/acpi_video0/brightness changes the brightness and makes the halevt -i report the keystrokes. The gnome-power-manager receives these keystrokes and tries to change the brightness, and as the levels round incorrectly, we have an infinite loop. There are two possible solutions then: - make the gnome-power-manager not attempt to change the brightness on receiving the keystrokes - use xrandr --output LVDS --set BACKLIGHT_CONTROL combination I have put this line in /etc/X11/Xsession.d/99setbacklittocombination. It works for me. I do not use KMS, for KMS you should put LVDS1 instead of LVDS
-- brightness is broken on MSI WIND U100 https://bugs.launchpad.net/bugs/415023 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
