kernel-devel-4.18.0-301.1.el8 breaks backlight control on my laptop
Posted: 2021/05/03 20:43:38
Hi All,
I have been using CentOS for a long time. For the first time I think I have found a bug I would like to report.
I run CentOS 8 stream on a Lenovo X240. I found that there is no backlight control with kernel-devel-4.18.0-301.1.el8. When I boot kernel-4.18.0-294.el8 backlight control works again.
I'm running the "Standard (X11 display server) on Xorg" gnome 3 session. Both the brightness slider in the panel in the top rightt corner and the <Fn> + <F5/F6> keys don't work and the backlight does not come on after suspend to RAM when I boot 4.18.0-301.1.el8.
I first noticed that the backlight did not turn on after suspend to RAM. This was after I had tuned my system with powertop, so at first I thought I had broken things myself, but then I found undoing the tuning changes does not solve the problem. Booting the previous kernel does.
I have been using CentOS for a long time. For the first time I think I have found a bug I would like to report.
I run CentOS 8 stream on a Lenovo X240. I found that there is no backlight control with kernel-devel-4.18.0-301.1.el8. When I boot kernel-4.18.0-294.el8 backlight control works again.
I'm running the "Standard (X11 display server) on Xorg" gnome 3 session. Both the brightness slider in the panel in the top rightt corner and the <Fn> + <F5/F6> keys don't work and the backlight does not come on after suspend to RAM when I boot 4.18.0-301.1.el8.
I first noticed that the backlight did not turn on after suspend to RAM. This was after I had tuned my system with powertop, so at first I thought I had broken things myself, but then I found undoing the tuning changes does not solve the problem. Booting the previous kernel does.