As mentioned before I am having some issues with my laptop’s hardware and controlling the screen brightness. Previously my work around was to set acpi_backlight=vender in the grub command line options. While this resulted in having full screen brightness it also removed my ability to use my keyboard function keys to adjust the screen brightness on the fly (not so good when you’re on battery). Removing this option allowed me to manually adjusted my screen brightness again but once again always started the laptop at zero brightness. What to do?
While far from a perfect solution my current work around is to use xdotool to simulate key presses on login which raise the screen brightness for me automatically. Here is the script that I run on startup:
#!/bin/bash
for i in {1..20}
do
xdotool key XF86MonBrightnessUp
done
While this works great it still isn’t perfect. Because xdotool requires an X session it means I cannot run it before one is created. If you were unaware the login screen, in my case MDM, does not run inside of X (it actually starts X when you successfully login). So while this will automatically brighten my screen it won’t do so until I type in my username and password, leaving me to type into a fully dark screen or manually adjust the brightness up enough to see what I’m doing. Hopefully I’ll have a better solution sooner rather than later…
If you’re like me you’ve been suffering through a crazy high-pitched sound emanating from your laptop speakers. Apparently this is a common issue with certain types of audio devices. Thankfully via the power of the Internet I’ve been able to finally find a solution!
It turns out that the issue actually stems from some power saving features (of all things) in the Intel HDA driver. So I simply turned it off and guess what? It worked.
1) Open up (using root) /usr/lib/pm-utils/power.d/intel-audio-powersave
2) Replace or comment out the line:
INTEL_AUDIO_POWERSAVE=${INTEL_AUDIO_POWERSAVE:-true}
3) In its place put the line:
INTEL_AUDIO_POWERSAVE=false
4) Reboot
Hopefully this also works for you but if not check out the site I found the solution at for some additional tips/things to try.
I recently upgraded my laptop to a brand new Lenovo Y410P and promptly replaced Windows 8 with a Linux install. Unfortunately I immediately ran into a very strange driver(?) issue where, on boot, the computer would default to the absolute lowest screen brightness level. This meant that I would need to manually adjust the screen brightness up just to see the login screen. Thankfully after some help from the excellent people over on the Ubuntu Forums I managed to find a very easy work around.
1) As root open up /etc/default/grub
I did this by simply issuing the following command:
sudo nano /etc/default/grub
2) Find the line that says GRUB_CMDLINE_LINUX= and add “acpi_backlight=vendor” to the list of options.
3) From a terminal run this command to update GRUB
sudo update-grub
4) Reboot!
That’s pretty much it. My computer now boots with the correct screen brightness as one would expect.
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