I looked some more into this setpci workaround to see where that magical F4 address comes from: sudo setpci -s 00:02.0 F4.B=a1 writes the brightness value (a1 in this example) directly into a register called "Legacy Backlight Brightness" (at address F4) of the [8086:2a42] hardware. The fact that there is such a register at that address can be found in the manufacturers documentation http://www.intel.com/Assets/PDF/datasheet/320122.pdf for that ([8086:2a42]) hardware. (btw. my other notebook with same graphics id where backlight setting works out of the box does ignore values written into the F4 register)
@maxwel cecato mavigno, I assume that lspci -nn|grep VGA gives you [8086:0044] as identification for your hardware. I looked into http://download.intel.com/design/processor/datashts/322812.pdf http://download.intel.com/design/processor/datashts/322813.pdf which is the datasheet intel published for the mobile i3 ([8086:0044]). I could not find a "Legacy Backlight Brightness" register there, so that workaround should not work here. In short, you have a different hardware, so I recommend that you file a new bug report with "ubuntu-bug linux". -- lucid extensa 5635z backlight dimming not working at all https://bugs.launchpad.net/bugs/518002 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
