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Old 06-24-2020, 08:48 AM   #1
chesterbelle
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screen resolution not avaliable


fresh new install i need to change my screen resolution to a 1024x768 im tryna use the arandr but does not show me

https://ibb.co/SrK0T5H

ps i know that my monitor can use 1024x768

how can i add the desired resolution to be able to choose at any given time

Last edited by chesterbelle; 06-24-2020 at 08:50 AM.
 
Old 06-24-2020, 12:20 PM   #2
bazio101
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screen resolution not avaliable

I think that this post may help you:
https://wiki.ubuntu.com/X/Config/Resolution
Check the bottom of the page, after:
"Adding undetected resolutions"
A combination of cvt and xrandr commands is what you need.
 
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Old 06-24-2020, 07:11 PM   #3
cordx
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seconding the xrandr (a terminal command) suggestion since that is what arandr is based on. if you don't see the resolutions you are used to, it might be about the driver assigned to your display adapter.
 
Old 06-25-2020, 01:22 AM   #4
enigma9o7
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I've had to do the procedure before, one of my kids PCs comes up 1024x768 but I want 1280x1024. I followed directions to use xrandr to add the mode, after using some other tool to figure out some numbers iirc.

Once you figure out the add mode command you can put it in your startup commands, then you'll see it in arandr.
 
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Old 06-29-2020, 09:41 PM   #5
chesterbelle
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still cant change the resolution

i did what the guide says
and after the
$ xrandr --newmode "800x600_60.00" 38.25 800 832 912 1024 600 603 607 624 -hsync +vsync

i can see the desired resolution
https://ibb.co/GvgtrJv


when i select that resolution bummm

new error
https://ibb.co/pdqFR41
 
Old 06-29-2020, 09:53 PM   #6
cordx
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what is the output of xrandr. if you post that, it would be helpful to use code tags to make it easier to read. after that it would be helpful to know what steps you took when you say "i did what the guide says".
 
Old 06-29-2020, 11:40 PM   #7
chesterbelle
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the steps taken

step 1

cvt 800 600 60

the outpost was
# 800x600 59.86 Hz (CVT 0.48M3) hsync: 37.35 kHz; pclk: 38.25 MHz
Modeline "800x600_60.00" 38.25 800 832 912 1024 600 603 607 624 -hsync +vsync

step 2

xrandr --newmode "800x600_60.00" 38.25 800 832 912 1024 600 603 607 624 -hsync +vsync

the outpost its

xrandr: Failed to get size of gamma for output default

after that apear in the arndr
but i cant use it
 
Old 06-29-2020, 11:52 PM   #8
cordx
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there is one last command listed on that page after the one you ran with --newmode:
Quote:
After the mode is entered, it needs to be added to the output using the --addmode command as explained above.
 
Old 06-30-2020, 12:03 AM   #9
chesterbelle
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not sure?

im not sure if is this 1 the last

xrandr --addmode S-video 800x600


the output of that 1 its

xrandr: Failed to get size of gamma for output default
xrandr: cannot find output "S-video"
 
Old 06-30-2020, 12:09 AM   #10
cordx
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my interpretation of that sentence is that you need to run xrandr --addmode with your new modeline. xrandr --addmode S-video 800x600 was just an example/suggestion. try
Code:
xrandr --addmode "800x600_60.00" 38.25 800 832 912 1024 600 603 607 624 -hsync +vsync
edit: now it is ready

Last edited by cordx; 06-30-2020 at 12:12 AM. Reason: hit enter too soon
 
Old 06-30-2020, 12:23 AM   #11
chesterbelle
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after that comand

output
xrandr: unrecognized option '800'
Try 'xrandr --help' for more information.


remember that my step 2 was an error

xrandr: Failed to get size of gamma for output default

maybe its that??
 
Old 06-30-2020, 12:38 AM   #12
chesterbelle
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idk if its usefull

spci -k | grep -iEA5 'vga|display|3d'

01:00.0 VGA compatible controller: VIA Technologies, Inc. P4M890 [S3 UniChrome Pro] (rev 01)
Subsystem: Biostar Microtech Int'l Corp P4M890 [S3 UniChrome Pro]
Kernel modules: viafb
80:01.0 Audio device: VIA Technologies, Inc. VT8237A/VT8251 HDA Controller (rev 10)
Subsystem: Biostar Microtech Int'l Corp VT8237A/VT8251 HDA Controller
Kernel driver in use: snd_hda_intel
 
Old 06-30-2020, 12:44 AM   #13
cordx
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Quote:
Originally Posted by chesterbelle View Post
remember that my step 2 was an error

xrandr: Failed to get size of gamma for output default

maybe its that??
that is definitely possible. i thought the failure message was in reference to this:
Quote:
Originally Posted by cordx View Post
what is the output of xrandr. if you post that, it would be helpful to use code tags to make it easier to read. after that it would be helpful to know what steps you took when you say "i did what the guide says".
can you run just

Code:
xrandr
with nothing else after it?
 
Old 06-30-2020, 12:54 AM   #14
chesterbelle
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i finally found the problem


was a driver issue

ifound the answer here
https://askubuntu.com/questions/9544...-unichrome-pro

sudo apt-get update
sudo apt-get install xserver-xorg-video-openchrome

reboot and bummm i have all the screen resolution at my disposal

ty guys
 
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Old 06-30-2020, 01:05 AM   #15
cordx
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thank you for taking the time to post your solution. if you have a moment to post at least your system make and model that might also be helpful in case anyone else who tries to install on something similar wanders in with your same problem.
 
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