Wrong Screen resolution - lost use of monitor even on rebooting

[newtusmaximus]

My main desktop on LL3.2 64 bit. Integrated video intel as per main profile.  Was happily running on 1024 x 768.    Opted to try higher resolution via display settings and screen went into x/y oscillations.  Did emergency shut down - holding down off button.  On rebooting, screen still in x/y oscillations totally unusable.

Any ideas please welcomed on how I can change screen resolution back to 1024 x 768  when I can not use screen.  Can it be done via grub and if so how.  Thank you

[firenice03]

How did you change resolution?
- terminal or file manipulation or GUI (display)??
- How recent of a system restore??

If terminal - you can access TTY to change things back as well as use CLI for Systemback to restore...

Perhaps xrandr to the resolution you prefer if changed via GUI.. (again TTY)

Code:

xrandr -s 1024x768

To access a TTY display, press: CTRL+ALT+F1.. to go back to desktop CTRL+ALT+F7
Will need to logo in to access..

[newtusmaximus]

CRT Monitor is iiyama vision master pro 451  19 inch
Screen resolution altered via menu/settings/display –  monitor identified as iiyama North America  18” no model named.  However  In previous ll2.8 32 bit  monitor identifed as iiyama 19 inch with maximum resoltion option 1024 x 768.

The only difference is that I have added extra RAM and matched  ram on each channel so achieving proper channel pairing.  This might have improved video capability??

Recent  fresh install of ll 3.2 64 bit.  So no recovery point other than default.

Confirm monitor is working still – not monitor fault  by using live DVD.

AS can’t get a screen so that I can log on, but can get live DVD working, is there a way to alter screen resolution of the LL set up on the HDD from the live DVD screen?

[firenice03]

Boot to HDD... after LL loads (to login) press CTRL+ALT+F1 you'll be at a TTY screen (terminal)

Login

With out a systemback up... I would try the following commands to force a resolution..

Code:

xrandr -s 1024x768

after entering code..
CTRL+ALT+F7 to return to desktop (login)
screen should hopefully return to a usable resolution..
Then using GUI confirm and/or set.. Test with a reboot..

[newtusmaximus]

firenice03 thank you for your perseverance
response to xrandr -s 1024x768  is can't open display.

[bitsnpcs]

Hello,

does the monitor have a button for degauss (it can be button at rear of monitor), or reset button ?
Or to unplug it from the power short time.

[newtusmaximus]

bitsnpcs I don't think it is a monitor issue,.  The Live dvd works OK .  Believe it must be a software settings issue.

Also booting from an external drive with LL2.8 32 bit also works OK  However the monitor has always had to be switched on once the boot up process has completed and awaiting log in.  Believe it is something to do with the loading order of drivers.

When loading from puppy linux usb, the monitor problem does not occur.

So somehow I need to change the display settings on the HDD back to 1024x768.  Terminal +xrandr does not appear to be the way.

[bitsnpcs]

newtusmaximus,

I had thought if the +xrandr had worked but did not appear it worked because the monitor stuck in oscillate then degauss makes a oscillate strong, and that is to reset the mask.
Also where you explain boot sequence and monitor - the monitor is a cold (crt type) and it is the power switched on, then it also does an auto degauss, usually it is of the lower amount oscillate, so the degauss and the monitor working, v/s boot in OS, it is having a direct relationship in this instances etc.

But how you describe the Live disc is working then you are right it needs the edit back in software.

Have you tried to do this Grub edit - "nomodeset"  it tells the kernel not to start video drivers until the system is running.
You problem is not for its intended use, but my idea being, without the video drivers loading the OS will default to a lower resolution and get you to the desktop to change the resolution in the Menu>Settings>display, then on reboot nomodeset does not "hold/remain" but
the resolution changes will, and so it could solve it etc. (hopefully so)

Update -

How to set display resolution from Grub

But can you please test the nomodeset theory first, I am interested to know if it can work, because it could help someone else reading the thread in future.

[newtusmaximus]

Agree have to stick with solving this as others may suffer this problem in the future.
So
a) Boot up - on switch, stabbing continuously on escape key - brings up GRUB screen
b) highlighting linux 4.4.0-71 generic press "e" key and into edit mode.  Insert "nomodeset"  in the correct line as per the link in previous post and then press F10.
c) turned off monitor until all boot up activity settled and then turned on monitor again.
d) Login flash screen displayed. Logged in
e) Sound and screen displays welcoming page - however display very large -
f) menu/settings/display  shows "default"  set at 640 x 480  .  This can not be changed  closed.
g) Terminal xrandr -s 1024x768  still states can't be accessed.
h) Back to main screen and close down via screen
i) Wait for a few minutes then reboot with screen off, wait until boot activity has quietened down, turn screen on and login screen displayed - login  and  x/y oscillations recur.  i.e nomodeset  and subsequent stab at changing display settings via menu has not worked.

[bitsnpcs]

Hello,

yes it seems "nomodeset" has done exactly as I had hoped, it has not loaded the drivers and has defaulted to a lower resolution.
eg - you can now access the desktop without having the oscillating display and are able to work with that further in wider range of ways, a couple of these see below, hopefully others can add more now you can access desktop.

On rebooting, nomodeset edited in Grub will not hold, eg; needs to be done again on each boot.
Or
You need to edit grub with nomodeset to get to the desktop, then edit grub file to make that hold after rebooting, LL-user explained to me how to do this correctly here,  - 

Then it will reboot each time without the oscillations, but it will still be at 640x480 resolution.
In this respect it is only a partial solution -
+ve= 1/ you can now get to your desktop
-ve= 2/ you cannot yet alter the resolution because the drivers are not being used to allow that.

Once the above edits are completed -
I am only theory/experimental, not using links of experienced users below here, so please take care -

Options 1 to try -

a/ purge and remove the previously used driver, if it's a package need to remove and purge that, as it 
    holds the incorrect resolution setting and cannot be changed, so it needs to be gone from your system.
b/ reboot (helps with ram clear)
c/ Lite Tweaks - clear ram (yes I know b), cache, packages
d/ install the driver again, hopefully it has amnesia and now is - Fresh & clean settings.
e/ use the Menu>Settings>Display option and set the 1024 resolution.
f/ not to reboot after b before f, reboot see if resolution settings hold
g/ optional remove nomodeset edit in grub file and replace with original, as per LL -user instructions.
h/ reboot see if settings hold, if no replace nomodeset settings in grub from desktop, so it holds.

Options 2 to try -

a/ a thru c
d/ Terminal xrandr -s 1024x768 

I have not used xrandr and cannot try and help with it yet.