XO Self Test/Display
Jump to navigation
Jump to search
The display test of the XO laptop goes through several steps. Each step pauses for a short time while the display is switched between frozen and live several times, as a test of the display controller and display memory.
| step | screenshot | note | method |
|---|---|---|---|
| 1 | 
|
Horizontal colour bars. You should check that the colours are all present, and look normal and clear. | .horizontal-bars16 |
| 2 | 
|
Vertical colour bars. You should check that the colours are all present, and look normal and clear. | .vertical-bars16 |
| 3 | 
|
A diagonal gradient between green and red colours. The most likely to show display noise as a result of EMI components on an XO-4. | gvsr |
| 4 | 
|
A diagonal gradient between green and blue. | gvsb |
| 5 | 
|
A horizontal gradient; black on left, white on right. Look for non-linearities. | hgradient |
| 6 | 
|
A vertical gradient; black on top, white on bottom. | vgradient |
| 7 | 
|
A crosshatch, white lines on black background. Look for lines that are not straight. The test also dims the backlight in steps at this point. | crosshatch |
| 8 |  
|
A series of filled rectangles are drawn in random positions with random colours. | random-selftest |
The method column above can be used to lock a test on screen; for example to show the gvsr test image;
ok select /display gvsr key page unselect
Press a key and the test will end.