Hezekiah Carty wrote:
> When I "echo 20 > /proc/acpi/video/VID/LCD0/brightness" as root, the
> contents of /proc/acpi/video/VID/LCD0/brightness update, but the screen
> brightness does not. There is a delay before the bash prompt comes
> back, comparable to the delay after hitting the Fn-key combo to change
> brightness.
>
Ok, this seems consistent with other reports (the delay seems new to me). That
we get the right generic interface but without any effect.
> I have to do the above "echo" command as root ("sudo su -" then the
> echo). Using "sudo echo ..." is not enough, as it tells me permission
> denied.
Right, this is because with sudo echo the output file redirection still uses
the normal user. There are some clever alternatives, but I usually fall back to
getting root before because I forget them too quickly.
When the thinkpad_acpi module is loaded, there should be an alternate control
location: /proc/acpi/ibm/brighness
This will have fewer different levels (0-7 here) but they work. Likely those
are used with your keys in conjunction with the other interface. So you get the
delays. Probably the best work-around for you would be the combination of the
thinkpad_acpi option and the "acpi_backlight=vendor" on the grub/kernel
commandline.
Could you please also attach a dump of your acpi tables:
sudo acpidump -o r61-acpi.dmp
--
the brightness applet and function key do not work on my thinkpad x61s
https://bugs.launchpad.net/bugs/324061
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