Is there a way to have a finer control of the screen brightness? I have been using the kamal~mjgbacklight kernels for the /sys/class/backlight/intel_backlight control in my Dell Studio 1558 since last spring. I now have the kamal~mjgbacklight kernel in my Sony Vaio All-in-One with 22" display. Both systems have the 1920x1080 screens and Core i3 CPU with the i915 driver and the Sony has the same issue with the backlight as the Dell.
Both of these systems have a blinding bright screen and the intel_backlight control solves those problems. Now I have tried the acpi_video0 control on the newer kernels and the result is not good enough. My current kernel is linux 3.0 and I have both intel_backlight and acpi_video0. The maximum brightness on the Dell is 4882 for the intel_backlight and 15 for the acpi_video0 except the acpi_video0 doesn't seem to work for the Dell. The Sony has maximum brightness of 4687 with the intel_brightness and maximum of 8 with the acpi_video0 and both can used at the same time. Here is the problem with the Sony: ACPI INTEL 0 1066 1 1396 2 1874 3 2334 . . 8 4687 The settings for acpi_video0 at 4,5,6,7 are too bright for my eyes to check the numbers and cause a type of blindness after a while. Most of the time I use the brightness setting of between 300 and 500 with the intel_backlight control because the setting for 0 or 1 on the acpi_video0 control is just too bright for my eyes. The problem is the same with Windows 7 where the minimum brightness is too bright. I think the acpi configuration might be finding the same settings as for Windows and that is the problem. My solution is to continue to use the intel_backlight control from the kamal~mjgbacklight kernel. Am I missing something here? Are there going to be any more fixes to the brightness control? I am about to try the linux 3.1 kernel except doubt the acpi_video0 will give a fine enough control of the brightness. Should I continue to use the kamal~mjgbacklight fixing kernel forever? I really like my Dell and my Sony when using the intel_backlight brightness control and can't stand them with the acpi_video0 control. Double thanks for Kamal- -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/568611 Title: Screen brightness control fails on Dell Studio 1558 To manage notifications about this bug go to: https://bugs.launchpad.net/null/+bug/568611/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
