Hide Forgot
After booting Fedora-16-TC-x86_64-Live-Desktop, I have tried the brightness control using keyboard shortcut. I can set brightness down only to the "lower" level of brightness. When setting brightness up, I can set it to "a little higher than lower", then "high" lever. On Fedora F15 with updated kernel, I was able to choose brighness level, step by step.
Created attachment 529637 [details] Little video to demonstrate the brightness setting problem
After looking at bug #745977 I have found the different brightness values reported by kernel At high level (default) 8 /sys/devices/platform/samsung/backlight/samsung/actual_brightness 12421 /sys/devices/pci0000:00/0000:00:02.0/drm/card0/card0-LVDS-1/intel_backlight/actual_brightness 7 /sys/devices/pci0000:00/0000:00:02.0/backlight/acpi_video0/actual_brightness When lowering the brightness 0 /sys/devices/platform/samsung/backlight/samsung/actual_brightness 12421 /sys/devices/pci0000:00/0000:00:02.0/drm/card0/card0-LVDS-1/intel_backlight/actual_brightness 7 /sys/devices/pci0000:00/0000:00:02.0/backlight/acpi_video0/actual_brightness When increasing the brightness 1 /sys/devices/platform/samsung/backlight/samsung/actual_brightness 12421 /sys/devices/pci0000:00/0000:00:02.0/drm/card0/card0-LVDS-1/intel_backlight/actual_brightness 7 /sys/devices/pci0000:00/0000:00:02.0/backlight/acpi_video0/actual_brightness After increasing the brightness 8 /sys/devices/platform/samsung/backlight/samsung/actual_brightness 12421 /sys/devices/pci0000:00/0000:00:02.0/drm/card0/card0-LVDS-1/intel_backlight/actual_brightness 7 /sys/devices/pci0000:00/0000:00:02.0/backlight/acpi_video0/actual_brightness I have later found some information in bug 737108 comment 2 https://bugzilla.redhat.com/show_bug.cgi?id=737108#c2 https://lkml.org/lkml/2011/4/20/1 https://lkml.org/lkml/2011/5/11/548 So this seems to be a kernel bug
There are a number of fixes in the latest rawhide kernel in this area. Would you be willing to install that and let us know if the issue is resolved?