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DL580 Debian 4.0 Wavy right side of screen

markwheeler
Occasional Contributor

DL580 Debian 4.0 Wavy right side of screen

I have 2 DL580's: a Gen 1 and Gen 2. Linux is installed on both. Display is fine for G2. Compaq Proliant banner and POST display OK on G1, but when the Linux desktop loads, the left 1/3 of screen is OK but the right 2/3 is a wavy transposed image that is not readable. 2 different monitor give the identical result.

What is wrong with the displayed image? How can I fix it?
2 REPLIES
markwheeler
Occasional Contributor

Re: DL580 Debian 4.0 Wavy right side of screen

They are DL380's; not DL580's.
Matti_Kurkela
Honored Contributor

Re: DL580 Debian 4.0 Wavy right side of screen

What type of monitor it is (CRT or LCD)?

It sounds like the computers may have been originally configured with a higher-specification monitor (higher maximum resolution and/or refresh rate) than the ones you're using now.

Most Linux distributions, including Debian, configure a set of "virtual consoles" by default. These are accessible using Ctrl-Alt- keystrokes. The standard convention is to have the graphical desktop at Ctrl-Alt-: it automatically becomes the default virtual console when the graphical desktop starts up.

The first six virtual consoles (Ctrl-Alt- to Ctrl-Alt-) normally have a text-mode login prompt. If you select the first virtual console, you may even see the tail end of the boot messages still on screen.

Switch to any of the text-mode virtual consoles, log in and become root. Now you can temporarily shut down the graphical desktop system and reconfigure it:

ls /etc/init.d/?dm
(find out whether the program that manages your graphical login screen is named xdm, kdm, gdm, wdm or something else. I'll assume you're using gdm after this point; substitute as appropriate)

sh /etc/init.d/gdm stop
(This stops the desktop system. This may cause an automatic switch to virtual console 1: if you were using another virtual console, simply use Ctrl-Alt- to return to the one you were using and continue.)

dpkg-reconfigure xserver-xorg
(This is one of the ways to reconfigure the graphics settings. The user interface is fairly self-descriptive.)

sh /etc/init.d/gdm start
(This re-starts the desktop system and automatically switches you to the virtual console 7. Remember to go back to the text-mode console you were using and log out, otherwise you will be offering free root access to anyone who can get at the console and knows something about Linux.)

MK
MK