Strange video mode output with VESA

[paradox]

>On Wednesday 02 June 2010 04:25 pm, David DEMELIER wrote:
>> Hi there,
>>
>> I was so happy to see that VESA is available for amd64, but
>> unfortunately it does not work really well for me. Take a look at
>> this picture :
>>
>> http://img717.imageshack.us/img717/7311/dsc00399h.jpg
>>
>> My laptop is a 15,6" so the best resolution is 1366x768, I tried
>> this
>>
>> : vidcontrol MODE_496. As you can see on the picture all the lines
>> : are
>>
>> completely everywhere, if I mouse the cursor they move away (I'm
>> not drunk!).
>>
>> I have SC_PIXEL_MODE in my kernel config.
>>
>> The console terminal is okay until I don't excess 1280x960x32 video
>> mode.
>>
>> Do you have any idea to fix this ?
>
>It is kinda known problem.  If the mode has larger bytes per scan line 
>than the minimum, few characters per line are lost when the screen is 
>scrolled up or down, i.e., framebuffer copies of whole screen.  When 
>you move the mouse onto the line, entire line is redrawn and 
>restored.  That's what you are seeing.  Ed might have a better idea 
>how to fix it (CC'ed).
>
>Jung-uk Kim

this is incorrent calculate the scan lines in the vesa driver
Jung-uk Kim should to fix it