I am using Ubuntu 14.04. I have an AMD Radeon 5570 HD graphic card. Actually, the default open source REDWOOD drivers aren't allowing me to choose my monitor's maximum screen resolution(which is 1366 x 768). I just have two resolutions displayed which are 1024×768 and 800×600 . If I give the command :
xrandr -s 1366x768
then the output is:
Size 1366x768 not found in available modes
So just for the sake of getting 1366×768 resolution I am forced to install the proprietary graphic driver that AMD gives me from its site. But if I install it(which itself is quite a problem-prone process), I undergo a lot of 'inconvenience'. Sometimes after an OS update, the driver crashes unity. Then I will have to uninstall that driver from a tty
and google around for a solution. Also I encounter screen tearing problems occasionally. In addition I also cant see my login screen(See this question which states this particular problem). The main problem is AMD does not update its driver as quick as Ubuntu updates its OS. This is quite irritating.
So, I want the maximum resolution(and performance) that my graphics card and monitor can give me without installing the 'problematic' proprietary graphic card driver that AMD gives. Is this possible? Suggestions please. Thanks in advance.
PS :-
More system specs details:-
- Intel i3 2100 processor
- AMD P8H61-M PLUS2 motherboard
- AMD Radeon 5570 HD graphic card
- DELL monitor
(BTW, Thank you for reading through my elaborate description!)
Best Answer
I didn't see any errors in the
Xorg.0.log
file the radeon driver seems to work well so try to create a Modeline for the unsupported resolution. Open a terminal with Ctrl+Alt+t and type:It should return:
Now try to create a new mode for
xrandr
using this Modeline:Finally apply the new mode to your desired output:
Note: Change DVI-0 by your current active output, check the result of the
xrandr
command to know which one to choose.EDIT: How to force lightdm to use this specific resolution:
Create a shell script in /usr/bin called
lightdmxrandr.sh
containing:Make
/usr/bin/lightdmxrandr.sh
executable:Modify your lightdm settings:
to add the following line:
This will set the login screen resolution. To set the desktop resolution, do the following:-
Open Startup Applications. One can do so from the dash.
In the startup applications window select "Add". Then give a name of your choice. Then press browse and select lightdmxrandr.sh from /usr/bin. Now select "Add". Make sure there is a tick mark before the entry you just added and then close the window.
Now reboot. Both your login screen and desktop must have the 1366x768 resolution.
PS:- Credits for the last part of the answer go to this question here.