patjak
commented
9 years ago Hi I promote vendor backlight over ACPI backlight in the driver and set the type to "firmware" so both i915 and ACPI should step aside (unless things have changed). Nevertheless your utils for setting the brightness could potentially pick anything in /sys/class/backlight. Can you adjust the backlight (with mba6x_bl loaded) directly with something like
echo 200 > /sys/class/backlight/mba6x_backlight/brightness?A long shot but perhaps it gets loaded too late. Have you tried putting mba6x_bl in your initramfs?
Cheers
flyingfalling
agimenez
arselzer
guikubivan
Thank you so much for your contributions.
I had great success installing the mba6x_bl driver on 3.14 and was using it for a while. The other day I tried to install xubuntu 14.10 (kernel 3.16) and adding the mba6x_bl driver caused several symptoms. I have installed all together about 5 times and tried different combinations of kernel parameters (acpi_backlight=vendor and video.somethingsomethingvendor=1) etc.. I also tried adding/removing the xorg.conf telling it to use the mba6x_backlight driver. I also tried kernel 3.17.
1) In xubuntu 14.10 (kernel 3.16.0), before installing the mba6x_bl driver, I was able to control the backlight normally with the f1/f2 keys (however it would either be all on or all off after suspending, which is what this driver is supposed to fix) 2) after installing the driver, F1/F2 no longer works to change the backlight even before I suspend (the brightness indicator "popup" correctly shows the brightness going up or down but the actual brightness does not change). 3) Furthermore, when booting, as soon as it hits the DM, the brightness seems to be set extremely low, roughly 5%. Using my keybindings, I am able to log in and use xbacklight +100 to increase it, however the F1/F2 keys do not work. 4) Trying to get around this problem by binding F1/F2 as hotkeys to xbacklight -10/xbacklight+10 in userspace does not work. I assume something else (the mba6x driver or whatever driver exists before installing that) is grabbing those keys first and taking priority... this is true either with or without the mba6x_bl driver installed. 5) These problems PERSIST even after removing the mba6x_bl driver! (no longer being able to control the brightness with F1/F2, and the low brightness at login time). The only solution I've found to get back to being able to control the backlight with F1/F2 before suspend is to do a clean install of the OS since I have no idea what has been fudged so I can reverse it.
Anyway, I have no idea if these issues are related to the kernel version or to other changes in xubuntu (e.g. now using systemd). I know that certain power-management things seem to have changed as it no longer seems to recognize i915 kernel parameters.
EDIT: by the way I tried both using the .deb package as well as installing from source from this git repo.
EDIT: xbacklight does NOT work by default after suspend, however it DOES work after installing your driver. So, I have installed your driver, and am grappling with 1) The backlight F1/F2 keys no longer work after installing your driver, the only way to change the brightness either before or after suspend is by in terminal doing xbacklight +10/-10 etc. 2) the "SUPER LOW BRIGHTNESS" by default for the "xubuntu" splash screen and then the login screen, and then after login still low, and I have to basically open a terminal blind and do xbacklight +199