[PC-BSD Testing] E machines backlight problem
ian-mcnulty at o2.co.uk
Sun Aug 26 14:40:55 PDT 2012
upgraded 9.0 to 9.1 RC1 and everything went smoothly except that the new
kernel has inherited the same problem that the version 3 Linux kernel
delivered to the E machine E525 ( and some acer laptops).
Basic problem is that the backlight is now switched off in PCBSD 9.1 which
renders the laptop unusable unless this clumsy workaround is used:----
Now, that's a bit annoying to fix, and once Ubuntu is booted, you can't
adjust your backlight. What we want to do is make ubuntu turn the
backlight on automatically when you boot it and also, allow you to adjust
your backlight once Ubuntu is booted. To do this:
gksudo gedit /etc/rc.local
and hit enter.
Above exit 0, put in:
setpci -s 00:02.0 F4.B=00
Save the file, and exit Gedit. If you get a popup message the "untitled
document" isn't save, ignore it and close without saving.
This fix will automatically make the backlight turn on upon boot.
Now to ensure you can adjust your backlight once Ubuntu has booted:
In terminal, enter the command:
gksudo gedit /etc/default/grub
In the file, find the line:
Change that line to:
Save the file. Exit gedit. If prompted to save untitled document, don't,
choose close without saving.
Now in terminal, type the command:
Wait for the process to finish then exit terminal. Reboot your PC.
Once rebooted, you will notice the purple screen, but you don't need to
adjust your backlight this time. You'll notice once you pass the boot
purple screen, the backlight will go out. Don't worry. Wait a few seconds,
then the backlight will come on, and ubuntu will boot up and you'll hear
the Ubuntu startup sound.
You will also notice that now you can also use the Fn key and use the
right and arrow keys to adjust the brightness. (Or whatever keys you use
to adjust the brightness). YAY! It's fixed.
Sorry if this should be addressed to the freebsd guys, but I hope the BSD
community will sort this out a bit quicker than the Linux folk
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