Bad monitor's horizontal & vertical sync at boot

[pecorfr]

Hi all,
When I boot my PC under Kubuntu 7.1, directly after I've made the choice in my GRUB's menu, Kubuntu displays a screen with a progress bar but the display is not correct and my monitor displays an OSD message warning of bad horizontal and vertical sync.
When X-Window starts, the sync is OK.
I heared about linux kernel boot parameters that could fix this problem.
Any help is welcome.

Regards.

[toad]

Re: Bad monitor's horizontal & vertical sync at boot

Hi,

first of all I am glad that it is anything serious

It sounds like a simply grub parameter is at fault here - please you post the last bit of your /boot/grub/menu.lst file. Specifically the few lines below

Title Ubuntu 7.10, kernel 2.6.22-14-generic

Tell us also please what kind of display you have.

[pecorfr]

Re: Bad monitor's horizontal & vertical sync at boot

Hi,

I'm currently not in front of my PC at home but at office.
If I'm not mistaken, I think that le line "Title" sounds like "Ubuntu 7.10, kernel 2.6.22-14-generic", I'm quite sure.
I have an "old" (4 years) Medion LCD flat screen of 15 inches but as I told above I'm not in front of my PC at home and I cannot tell you what are the right values to use for these horizontal and vertical syncs.

Regards.

[toad]

Re: Bad monitor's horizontal & vertical sync at boot

yeah, the few lines below that especially the kernel one as frame buffer commands etc are appended to it

[Rog131]

Re: Bad monitor's horizontal & vertical sync at boot

Maybe this helps:

Topic: logo screen has a bad resolution
http://kubuntuforums.net/forums/index.php?topic=9455.0

Also:
BootOptions
https://help.ubuntu.com/community/BootOptions
and
HOW TO: GRUB Methods - Toolkit
http://kubuntuforums.net/forums/inde...opic=3081671.0

[pecorfr]

Re: Bad monitor's horizontal & vertical sync at boot

Hi all,

Yesterday evening, I added the boot option "vga=792" to the end of line "kernel ..." of the file /boot/grub/menu.lst (resolution of 1024*768 16millions of colors indicated in the documentation of my monitor) and, unfortunately, it doesn't change anything.

Other idea ?

Regards.

[Rog131]

Re: Bad monitor's horizontal & vertical sync at boot

Is there any difference if you:

- start with vga=791 (16 bit)
- start with vga=789 (800x600)

[pecorfr]

Re: Bad monitor's horizontal & vertical sync at boot

Hi,

No way...

[toad]

Re: Bad monitor's horizontal & vertical sync at boot

A different approach What you are not seeing is interesting boot info. Why hide it in the first place? The programme which prevents you from seeing this info is usplash.

To remove it you would have to type

sudo apt-get remove usplash

I normally do this and have therefore not tried reinstalling it. If you do, you might want to use the purge option

sudo apt-get remove --purge usplash

and then try a new usplash install

sudo apt-get install usplash

Have fun

[pecorfr]

[SOLVED] Re: Bad monitor's horizontal & vertical sync at boot

Hi all,

I finally found what was the cause of the problem.
Indeed, the system is installed by default with a usplash resolution of 1280*1024 (defined in the file /etc/usplash.conf).
I just had to modify to 1024*768.

[toad]

Re: Bad monitor's horizontal & vertical sync at boot

Glad you got it sorted. usplash is right royal pain in the behind and it is hard to understand why canonical continue to pour effort into it instead of splashy. There is a loooooong thread about this on the ubuntu forum...