On a Lenovo 420s, running Natty (2.6.38-8-generic (64bit), xorg-server
2:1.10.1-1ubuntu1.1, NVIDIA dlloader X Driver 270.41.06 Mon Apr 18
14:55:25 PDT 2011), I can switch to a console (Ctrl-Shift-F1) and change
the brightness there.
Using Fn+Home/End (brightness up/down) changes the brightness indicator
in the top, right corner when running X11. The values of
/sys/devices/virtual/backlight/acpi_video0/{brightness,actual_brightness}
changes as one would expect. However, the builtin LCD remains at a fixed
brightness level when in X.
I noticed these error messages in /var/log/Xorg.0.log which might or
might not be related:
[ 5.073] (WW) Open ACPI failed (/var/run/acpid.socket) (No such file
or directory)
[ 6.423] (II) NVIDIA(0): ACPI: failed to connect to the ACPI event daemon;
the daemon
[ 6.423] (II) NVIDIA(0): may not be running or the "AcpidSocketPath" X
[ 6.423] (II) NVIDIA(0): configuration option may not be set correctly.
When the
[ 6.423] (II) NVIDIA(0): ACPI event daemon is available, the NVIDIA X
driver will
[ 6.423] (II) NVIDIA(0): try to use it to receive ACPI event
notifications. For
[ 6.423] (II) NVIDIA(0): details, please see the "ConnectToAcpid" and
[ 6.423] (II) NVIDIA(0): "AcpidSocketPath" X configuration options in
Appendix B: X
[ 6.423] (II) NVIDIA(0): Config Options in the README.
However, the acpid.socket file exists and is readable
# file /var/run/acpid.socket
/var/run/acpid.socket: socket
# ls -la /var/run/acpid.socket
srw-rw-rw- 1 root root 0 2011-06-24 23:15 /var/run/acpid.socket
--
You received this bug notification because you are a member of Ubuntu
Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/773710
Title:
[Lenovo T420s] Brightness keys make the indicator work, but don't
actually dim or brighten the screen
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/773710/+subscriptions
--
ubuntu-bugs mailing list
[email protected]
https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
