I have aided a work colleague in purchasing a Lenovo G400s with i5 processor and Nvidia graphics.
I have installed Mint 14 KDE edition and all is well.... except:
When the laptop is started up the screen brightness is 0. It is black. If I press keyboard the brightness control keys to increase brightness I get a visible display. Also, once logged in the KDE settings take over and the display works 100% fine. The screen leaps into full brightness - and is really clear.
I HAVE tried the fix:
The file /etc/rc.local add before line *exit 0*:
*echo 5 > /sys/class/backlight/acpi_video0/brightness
exit 0 *
Where *5* is the brightness level from 0 to 10
In fact, you have to set your brightness as you want. Then you open the
It does NOT work on the Lenovo. However, using the command as root in konsole works! I assume this is a permissions problem because I cannot set this via the CLI if not logged in as root.
I have modified rc.local to no avail. I have installed xbacklight and confirmed that works... but not from rc.local on start up.
Not sure even where to go for diagnostics on this. I am still relatively new to Linux and my new job is BACK BREAKING - twelve hour days, weekends, 'holidays.' My wife is dragging me away from this machine to sleep. So time for fix hunting is limited.
Good news is that every thing else works fine and the SW is all there.
Got to eat and sleep. Thanks in advance. I am putting this in Mint because I suspect Mint is handling things a little differently to Unbuntu.
---------- Post added 08-18-13 at 04:28 PM ----------
Sorry - I am tired... It is mint *15* - not 14.