https://bugzilla.kernel.org/show_bug.cgi?id=153401
--- Comment #20 from Zhang Rui <[email protected]> --- (In reply to Luca Viggiani from comment #17) > (In reply to Zhang Rui from comment #15) > > > > (In reply to Luca Viggiani from comment #13) > > > Ok I have found a solution... > > > In BIOS settings of the laptop I have disabled "Load Legacy Boot Options" > > > from the Boot menu. > > > That setting was required to be enabled before kernel 4.7.x in order to > > > make > > > the fn keys to work. Now it must be disabled. > > > > why it must be disabled? > > Otherwise you get the flash effect (see my original report) with kernel 4.7 > > > > > > As a side effect now brightness changes in steps; before it was changing > > > in > > > a smooth way. But this is very minor thing. > > > > > how does it change in steps? > > For example if you are at 100% and set it at 90% it jumps immediately to > 90%. The old behavior (kernel 4.6 + BIOS setting enabled) it changes > smoothly from 100% to 90% in about one second. > > > > I'm still confused. > > some questions: > > 1. in 4.6 kernel, with BIOS option disabled, what it behaves like? > fn keys to adjust brightness do not work > > > 1. in 4.6 kernel, with BIOS option enabled, what it behaves like? > brightness can be adjusted; smooth transition between current and new value > > > 1. in 4.7 kernel, with BIOS option disabled, what it behaves like? > brightness can be adjusted; step transition > > > 1. in 4.7 kernel, with BIOS option enabled, what it behaves like? > Flash effect (smooth changes): for example if I set it to 50% it starts > "bouncing" from 100% to 50% and back in a smooth way. so you mean the brightness changes, then restores back? If the BIOS option keeps enabled, but you got different behavior in 4.6 and 4.7 kernel, this does sounds like a regression. BTW, can you please provide the kernel config you're using so that gazza can try the same configuration with you? -- You are receiving this mail because: You are watching the assignee of the bug. ------------------------------------------------------------------------------ _______________________________________________ acpi-bugzilla mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/acpi-bugzilla
