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I've installed fglrx driver on my Asus k52je laptop with mobility radeon hd 5470 using additional drivers window in ubuntu. I get black screen after reboot. When I hold power button i can barely see shutdown, restart, lock and suspend icons and I am able to choose one. I've also tried building driver from sources and installing from xorg-edgers. None of those worked. Is there any workaround?

EDIT:

It seems I can use external monitor without issues

Try adding acpi_backlight=legacy or acpi_backlight=vendor (not both) as a kernel parameter.

If it doesn't help, you could look into this Wiki-Article for more information.

Good luck!

Try

1.

sudo apt-get install xbacklight, then

xbacklight -set xx

(0-100 as far as I remember)

2.

Updating ATI driver to the newest >>HERE<<

3.

Downgrade fglrx to 13.1 (Reported to work several times in similar cases)

You should try installing the driver from the AMD website itself, I suppose. I will tell you how to do that below :-

1. Update your OS completely.


2. Go to this website.


3. Now select the appropriate options there. Note that you must select Linux x86_64 for 64 bit OS and Linux x86 for 32 bit OS.


4. Now if you proceed by selectin 'Display results' there you will find your drivers.


5. 
   

   Before you begin downloading check the release notes and installer notes without fail. See if your system meets all the system requirements mentioned.(This way we can know if any of your system requirements are not met and then start answering according to that too. Added advantage for you, you know!) To check the system requirements, use the following commands:-

   
   
   

   uname -a - To know your kernel version
   
   ldd --version - To know your eglibc version
   
   Xorg -version - To know your Xorg version

   
   



6. Now if all those requirements are met then proceed to downloading the driver.



7. Then follow the installer notes for successful installation.

PS:-

• Don't think that your OS isn't supported by the driver just because the OS is not mentioned in the release notes of the driver! If you meet the system requirements its fine.


• Also don't worry if your driver installer shows up like this without any text! :-

Just see the screen shots given in the installer notes, click accordingly and you can install.

• And don't forget to edit your question if any system requirement is not met or even if all are met but you can't make it work properly. Users will answer accordingly then.

There is one thing to try that usually fixes this. Open /etc/default/grub in your favourite editor and find the line that starts with GRUB_CMDLINE_LINUX. Insert the following within the double quotes:

acpi_backlight=vendor

and run : sudo-mkconfig -o /boot/grub/grub.cfg

Changes take place on reboot.

If you can see the shutdown or restart other options it means the drivers installed properly but they also reduced your LCD brightness(not the brightness value in system settings)

open terminal and run the below command

xrandr --output LVDS1 --brightness 0.9

Its range 0.0(lowest) to 1.0(highest)

Here is another command that changes the display brightness value

sudo setpci -s 00:02.0 F4.B=xx

Where xx is the desired brightness in hexadecimal ranging from 00 (brightest) to FF (no brightness at all).

I hope that helps