goodmenzy at gmail.com
Sat Nov 3 07:42:25 PDT 2007
IBM T30 laptop computer,
I use kernel param vga=0317 to load kernel with framebuffer console
at resolution 1024x768 and the depth=16. The driver is vesafb in the
kernel source package.
If vga=0318 is set, the console refuse to show anything, but the
kernel can boot correctly ( I can login it with SSH ).
But the KDE can run at a resolution of 1024x768 and with 32bit depth.
when KDE run , it use Radeon driver( the one in the kernel source tree).
Who can tell me why? Why I can't use 32bit depth in console?
Suppose I have no enough Video memory, It is reasonable that the console
refuse to display anything when vag=0318 is set at grub.conf.
But why kde can run at a 32bit depth ?
In KDE, i use pseudo tty, I check th /dev/fb0, and using some code
to test it.
I found that by /dev/fb0, I can contol the top half of screen.
What push me into fuzz is : when the system run KDE, why the /dev/fb0
not change to enough size ?
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