Solution to the line problem after the screen is moved during ubuntu7.04

Last month I installed Ubuntu7.04 (ubuntu-7.04-alternate-i386.iso) with hard drive, but while using it, I found that when I quickly drag the window, web page quickly drag browse and some software drop-down menu, will leave obvious lines on the screen (someone is also called "LED screen burning !), It can be removed only after a window is dragged from the line, just like an eraser. At first I suspected there was a problem with the graphics card driver, but it was not like it, and then on a foreign website occasionally saw an article about ubu last month with a hard disk mounted Ubuntu7.04 (ubuntu-7.04-alternate-i386.iso ), however, during the use process, I found that when I quickly drag the window, the web page quickly drag browse and some software drop-down menus, will leave obvious lines on the screen (someone is also called "LED screen burning !), It can be removed only after a window is dragged from the line, just like an eraser. At first, I suspected there was a problem with the graphics card driver, but it was not like this. Later, I occasionally saw an article about ubuntu testing on a foreign website (delllatitude csx ht500, graphics card 4 MB, in the article, the maximum display color is 24 bits. It turns out that the computer's video card is not configured enough. We recommend that you change the color to 16 bits, So we changed the color to 16 bits in the environment variable. Then, restart the system and the drag line disappears, there is no such situation when you drag it quickly.

Now we will teach you how to change from 32bit or 24bit to lower 16bit or 8bit: