Super User is a question and answer site for computer enthusiasts and power users. Join them; it only takes a minute:

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

First let me point out that this has never occurred when booting Windows. So I don't think it's damage on the hardware.

So, I'm booting my Inspiron 1501 laptop running Debian, and the XDM (X Display Manager) loads the X Window System and it tries to display the login screen. Problem is, all I see is vertical stripes that are either green, blue or red (on a black background). To overcome the problem I do one of the follwing:

1: Enter my credentials, hit enter, the Window Manager loads (which happens to be Awesome), and the display is back to normal.


2: Close the lid to the point where the screen switches off, and then open it again. It's back to normal, and I can see the login screen.

In other words, it's not really a problem, I just want to know what is going on.

Earlier I used the GDM (Gnome Display Manager) and this problem didn't happen. I think it is somehow related to display mode, but I'm not sure.

Also, one final thing that might relate to the same problem. Sometimes, the first thing I see after the lines disappear is some distorted Windows 7 desktop :D. This happens if I rebooted my computer from Windows 7 to go into Debian. It seems like unflushed data in the video cards framebuffer.

Any clues? :)

share|improve this question
sound like a simple resolution or sync (the display h/v sync thing) problem. is this on a laptop? is this on the laptops own screen? does it have anything to do with an external screen? – Psycogeek Mar 4 '12 at 9:12
it's on the laptops own screen (inspiron 1501 from dell), no external screen is connected. – Håvard Geithus Mar 4 '12 at 13:00

You must log in to answer this question.

Browse other questions tagged .