Changing brightness have no effect with kernel 3.15.10
Posted: 24 September 2014, 15:25
I can not change backlight brightness when I boot with kernel 3.15.10. I can change the value without any problem, but nothing happens. Even keyboard shortcuts still work fine (Fn + Up arrow and Fn + Down arrow), but without effect on brightness.
After some experimenting I figured out that if I boot with 3.15.8, everything works fine.
If I remove acpi_backlight=vendor and boot with 3.15.10 I can change brightness again.
I can use changed boot line as workaround, but I think this should be fixed in some other way.
[viking@delta ~]$ uname -a
Linux delta.sbb.local 3.15.10-nrjQL-desktop-1omv #1 SMP PREEMPT Tue Sep 16 15:54:07 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux
Bug report can be found here
After some experimenting I figured out that if I boot with 3.15.8, everything works fine.
If I remove acpi_backlight=vendor and boot with 3.15.10 I can change brightness again.
I can use changed boot line as workaround, but I think this should be fixed in some other way.
[viking@delta ~]$ uname -a
Linux delta.sbb.local 3.15.10-nrjQL-desktop-1omv #1 SMP PREEMPT Tue Sep 16 15:54:07 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux
Bug report can be found here