Question

8

How can I get my monitor's maximum resolution without the proprietary AMD graphic driver installed?

rated 0 times [ 8] [ 0] / answers: 1 / hits: 11857 / 2 Years ago, sat, october 29, 2022, 6:29:19

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 1024x768 and 800x600 . 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 1366x768 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!)

Answers

Only authorized users can answer the question. Please sign in first, or register a free account.

llianconclad

Add To Favorites

Follow

Total Points: 65

Total Questions: 109

Total Answers: 127

Location: Mali

Member since Fri, Dec 3, 2021

2 Years ago

llianconclad questions

1 Problem with software updating - package conflicts

Sun, May 1, 22, 08:47, 2 Years ago

1 Ubuntu 21.10 switched to nftables, so why is iptables still available?

Sun, Apr 3, 22, 22:27, 2 Years ago

1 kdeconnect-app fails to startup

Tue, Nov 8, 22, 02:33, 2 Years ago

1 How to install Sagemath on Ubuntu 20.04?

Mon, Aug 23, 21, 15:58, 3 Years ago

1 What does "Memory unclaimed" mean in lshw output?

Sun, Jul 25, 21, 18:19, 3 Years ago

View All

answered 2 Years ago istmasted · Accepted 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:

cvt 1366 768

It should return:

# 1368x768 59.88 Hz (CVT) hsync: 47.79 kHz; pclk: 85.25 MHz

Modeline "1368x768_60.00"   85.25  1368 1440 1576 1784  768 771 781 798 -hsync +vsync

Now try to create a new mode for xrandr using this Modeline:

xrandr --newmode "1368x768_60.00"   85.25  1368 1440 1576 1784  768 771 781 798 -hsync +vsync

Finally apply the new mode to your desired output:

xrandr --addmode DVI-0 1368x768_60.00

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:

#!/bin/sh

xrandr --newmode "1368x768_60.00"   85.25  1368 1440 1576 1784  768 771 781 798 -hsync +vsync

xrandr --addmode DVI-0 1368x768_60.00

xrandr --output DisplayPort-0 --off --output DVI-0 --mode 1368x768_60.00 --pos 0x0 --rotate normal --output HDMI-0 --off

Make /usr/bin/lightdmxrandr.sh executable:

sudo chmod +x /usr/bin/lightdmxrandr.sh

Modify your lightdm settings:
```
sudo gedit /usr/share/lightdm/lightdm.conf.d/50-ubuntu.conf
```
to add the following line:
```
display-setup-script=/usr/bin/lightdmxrandr.sh
```
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.