** Summary changed: - gnome-rr: Adjust the minimum brightness level when the maximum >= 100. + gnome-rr: Normalize the minimum brightness level.
** Description changed: - If the maximum brightness is equal to or bigger than 100, it has higher - possibility that zero is off. So adjusting the minimum brightness to avoid the problem. + This patch is aimed to normalize the minimum brightness level for 20 + brightness steps used in gnome-settings-daemon and bring a better and + consistent user experience for the brigtness control in + gnome-settings-daemon and gnome-control-center. + + For example, most Intel Haswell/Broadwell UMA laptops have the same 937 + value as their maximum brightness level on Linux kernel 3.16 by default. + + By this patch, the minimum brightness level will be changed to 17 + because 937 / 20 == 46 and 937 % 46 == 17, and 17 is a reasonable and + visible brightness level as the minimum brightness level on these laptops. + If we set 0 to /sys/class/backlight/intel_backlight/brightness, it makes + the screen off. + If we set 1 to /sys/class/backlight/intel_backlight/brightness, the + screen becomes hard to see the content. + So 17 is a better brightness level. + + This patch should not affect existing ACPI brightness control especially + for those laptops having the maximum brightness level under 20. + + This also avoided the screen off when using the minimum brightness level + under some condition. Quotes from http://cgit.freedesktop.org/xorg/proto/randrproto/tree/randrproto.txt "This property controls the brightness on laptop panels and equivalent displays with a backlight controller. The driver specific maximum value MUST turn the backlight to full brightness, 1 SHOULD turn the backlight to minimum brightness, 0 SHOULD turn the backlight off." Quotes from http://msdn.microsoft.com/en- us/library/windows/hardware/ff569755(v=vs.85).aspx "Brightness levels are represented as single-byte values in the range from zero to 100 where zero is off and 100 is the maximum brightness that a laptop computer supports. Every laptop computer must report a maximum brightness level of 100; however, a laptop computer is not required to support a level of zero. The only requirement for values from zero to 100 is that larger values must represent higher brightness levels." -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to gnome-desktop3 in Ubuntu. https://bugs.launchpad.net/bugs/1340544 Title: gnome-rr: Normalize the minimum brightness level. Status in GNOME Desktop Common Files: New Status in Gnome Settings Daemon: New Status in Unity Settings Daemon: New Status in “gnome-desktop3” package in Ubuntu: New Bug description: This patch is aimed to normalize the minimum brightness level for 20 brightness steps used in gnome-settings-daemon and bring a better and consistent user experience for the brigtness control in gnome-settings-daemon and gnome-control-center. For example, most Intel Haswell/Broadwell UMA laptops have the same 937 value as their maximum brightness level on Linux kernel 3.16 by default. By this patch, the minimum brightness level will be changed to 17 because 937 / 20 == 46 and 937 % 46 == 17, and 17 is a reasonable and visible brightness level as the minimum brightness level on these laptops. If we set 0 to /sys/class/backlight/intel_backlight/brightness, it makes the screen off. If we set 1 to /sys/class/backlight/intel_backlight/brightness, the screen becomes hard to see the content. So 17 is a better brightness level. This patch should not affect existing ACPI brightness control especially for those laptops having the maximum brightness level under 20. This also avoided the screen off when using the minimum brightness level under some condition. Quotes from http://cgit.freedesktop.org/xorg/proto/randrproto/tree/randrproto.txt "This property controls the brightness on laptop panels and equivalent displays with a backlight controller. The driver specific maximum value MUST turn the backlight to full brightness, 1 SHOULD turn the backlight to minimum brightness, 0 SHOULD turn the backlight off." Quotes from http://msdn.microsoft.com/en- us/library/windows/hardware/ff569755(v=vs.85).aspx "Brightness levels are represented as single-byte values in the range from zero to 100 where zero is off and 100 is the maximum brightness that a laptop computer supports. Every laptop computer must report a maximum brightness level of 100; however, a laptop computer is not required to support a level of zero. The only requirement for values from zero to 100 is that larger values must represent higher brightness levels." To manage notifications about this bug go to: https://bugs.launchpad.net/gnome-desktop/+bug/1340544/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
