Screen Resolution

[chimi_12]

Hi all,


I have just installed Lubuntu in an old PC, at first try I used the normal iso installer, but after select the language and hit install, I could not see the installation wizard because of the screen resolution. Well, I could solve this selecting nomodeset (in F6 menu) and typing xforcevesa Then the installation wizard starts without problems but my CD had a problem and then I could not complete the installation. Then downloaded the alternate install and the installation completes perfectly, but... once again, I have the screen resolution problem and even can't log in. (see the image attached, there you can see the problem).

I looked for a solution and I found some threads about xrandr (here: https://wiki.ubuntu.com/X/Config/Res...s_persistently ) but when I type xrandr in terminal (I did Ctrl+Alt+F1 to switch from the graphical mode to terminal) I get the message: "can't open display" also I looked for a xorg.conf file and I didn't found anything.


So, now I don't know how to solve and how to search for solutions to my problem.


All the help you can bring me would be really appreciate!!


Thanks in advance!!

[matt_symes]

Hi

To get xrandr to work at a console you need to set the display environmental in the console.

DISPLAY=:0 xrandr

Kind regards

[chimi_12]

Hi matt_symes,

Thanks for your reply and your time!

You say,

set the display evironmental in the console

so, I will be able to run xrandr in console. But, will this help me to solve the problem of resolution in graphical mode? I mean, I feel that this command

DISPLAY=:0 xrandr

will make xrandr work but only in console. And my goal is change the resolution in graphical mode, because right now I cant read or see anything.

Thanks Again.

[matt_symes]

Hi

DISPLAY=:0 xrandr

The above command will get the display settings (screen resolutions) in the console.

You can then add modes (resolutions) and change the settings of the existing mode.

This will affect the GUI and it's why you need to pass the DISPLAY parameter so it know which display (X server) to use.

Kind regards

[chimi_12]

Perfect!!


Now I understand, thanks so much!!


Regards

[chimi_12]

Hi Again matt_symes,

I tried the command you said, but now I get another error:

No protocol specified
Can't open display :0

I search for it, and found some commands like:

export XAUTHORITY=/home.....

and some others similar, but I guess that these commands are for graphical environment and I'm just using a tty terminal (CTRL+ALT+F1) so, seems that these commands will not work for me.

Do you know if I'm doing something wrong or if is there another alternative to solve my problem?

Thanks!!!

[matt_symes]

Hi

Are you logging into the same console with your user name and password ?

Try this in the console.

export DISPLAY=:0
xhost +
xrandr

The last command will give you a list of screen resolutions. select one with.

xrandr -s <screen_mode>

You can then also add new modes and set them.

I think your problem is fixable.

I have been testing these commands on my machine.

Kind regards

[chimi_12]

Hi,

Yes I'm logging in with my username and password, I tried what you said me.

Try this in the console.

export DISPLAY=:0
xhost +
xrandr

But I get the same message (see the image attached)

Thanks

[humpty88]

Some tips;
Try the PC on another monitor just to see what happens.
Also have a look at /var/log/Xorg.0.log - will show what happened with the auto-detection.

[matt_symes]

Hi

If, from the console, you type

DISPLAY=:0 xauth list $DISPLAY

Does that return some along the lines of

MIT-MAGIC-COOKIE-1 xxxxxxxxxxxxxxxxxxxxxxxxxxx

where xxxxxxxxxxxxxxxxxxxxxxxxxxx is a long alpha numeric number ?

Can you also post the output of

ls -l /home/$USER/.Xauthority

We may have to try to tackle this another way.

Kind regards