BIOS upgrade to 10G (see #265, #269) fixed it for me too :-) As others, I can access just 5 levels by hotkeys (seems like 9 levels jumping by 2 each press, hard to prove). However, after running:
xrandr --output LVDS --set BACKLIGHT_CONTROL combination # no KMS, YMMV I can access all 9 levels by hotkeys! What's strange, it keeps working for all BACKLIGHT_CONTROL values, even when I set it back to the original "kernel" value! So I'm now unable to reproduce the 5 levels situation (will experiment more next time I reboot). Of the possible BACKLIGHT_CONTROL modes, "kernel" seems best because it allows to read and set the brightness through xrandr: xrandr -v --verbose | grep -A1 BACKLIGHT xrandr --output LVDS --set BACKLIGHT 5 # 0..8 inclusive (again, I'm running with nomodeset => KMS off; xrandr interface details seem to depend on this so YMMV.) However, with all BACKLIGHT_CONTROL modes, I can read and set the brightness through: cat /proc/acpi/video/IGD/LCD/brightness echo 70 | sudo tee /proc/acpi/video/IGD/LCD/brightness # 20..100 inclusive, in steps of 10 The brightness applet is also independent of BACKLIGHT_CONTROL - for all modes, can access all 9 levels but can't read the current level (sometimes its icon says it knows it can't read it, sometimes doesn't - but anyway its level never reflects changes made by hotkeys). All this leads me to guess the 5-levels issue is still some kind of keystroke-stuffing-triggering-double-adjustment, unrelated to the xrandr interface - but somehow using that xrandr interface once kills this interaction... -- brightness is broken on MSI WIND U100 https://bugs.launchpad.net/bugs/415023 You received this bug notification because you are a member of Kubuntu Bugs, which is subscribed to kdebase-workspace in ubuntu. -- kubuntu-bugs mailing list kubuntu-b...@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/kubuntu-bugs
