* Valmor de Almeida (val.gen...@gmail.com) [20.04.09 22:29]: > Sebastian Günther wrote: > > > > > This is the hint: intelfb can't change the video mode. But intelfb can > > be used if you /also/ add a vga to the kernel command line. I will post > > mine as an example: > > > > kernel /boot/vmlinuz root=/dev/ram0 real_root=/dev/mapper/system-slash \ > > ro resume=swap:/dev/mapper/system-swap vga=0x318 quiet \ > > video=intelfb:1024x768...@60,mttr,noaccel,hwcursor,vram=4 \ > > splash=silent,theme:natural_gentoo console=tty1 > > Am I understanding this correctly? vga=0x318 means 1024x768...@60. Your > line calls intelfb with almost the same mode except at 32-bit pixel > depth instead of 24. Is this the only change intelfb will make to the > video mode? or you end up with 1024x768...@60 anyway? >
vga parameter has a /colour/ depth of 24 bits and 32 bits per pixels
To clarify colour depth and bits per pixel, from man xorg.conf:
Depth depth
This entry specifies what colour depth the Display subsection is to be used
for.
This entry is usually specified, but it may be omitted to create a
match-all
Display subsection or when wishing to match only against the FbBpp
parameter.
The range of depth values that are allowed depends on the driver. Most
drivers
support 8, 15, 16 and 24. Some also support 1 and/or 4, and some may
support
other values (like 30). Note: depth means the number of bits in a pixel
that
are actually used to determine the pixel colour. 32 is not a valid depth
value.
Most hardware that uses 32 bits per pixel only uses 24 of them to hold
the
colour information, which means that the colour depth is 24, not 32.
> It seems that the mode option of intelfb does not do anything and the
> mode needs to be set with vga which has specific values.
>
intelfb is not able to to change the resolution, vga is. With KVM this
may have changed, but I didn't had the time to test 2.6.29.
> Thanks,
>
> --
> Valmor
>
>
Sebastian
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