[Linux-fbdev-users] intelfb on Thinkpad R60

[Marcus B. <ma...@be...>]

Hi,

I'm trying to use a framebuffer console with intelfb on my Thinkpad R60 with
Intel 945GM chipset and kernel 2.6.20-rc6. I cannot make out from this
thread [1] if it's supported at all.

First the kernel command line:

~$ cat /proc/cmdline
root=/dev/mapper/root ro exec-shield=1 resume=/dev/mapper/swap
video=intelfb:mode=1024x768 fbcon=scrollback:64k vga=792

I tried several kernel configuration options:

*First, if I compile intelfb and fbcon into the kernel, and no other frame
buffer modules, I don't think the "vga" parameter is ever processed. I get a
blank console and the famous message
  intelfb: Video mode must be programmed at boot time.
in the log.

*If I also select CONFIG_VIDEO_SELECT (which forces me to also include
CONFIG_VGA_CONSOLE), then it appears to switch to video mode at boot, but
the screen is garbled with horizontal multi-coloured stripes and the system
locks up before even booting.

(Side question: Should CONFIG_VIDEO_SELECT really depend on
CONFIG_VGA_CONSOLE?)

*If I additionally compile in the vesafb driver, then it seems to grab the
console despite the "video=intelfb:..." command line argument, and I get a
working vesafb console.

~$ dmesg|grep ^[a-z]*fb:
vesafb: framebuffer at 0xd0000000, mapped to 0xf8880000, using 6144k, total
7872k
vesafb: mode is 1024x768x32, linelength=4096, pages=1
vesafb: protected mode interface info at 00ff:44f0
vesafb: scrolling: redraw
vesafb: Truecolor: size=8:8:8:8, shift=24:16:8:0
intelfb: intelfb_init
intelfb: Framebuffer driver for Intel(R)
830M/845G/852GM/855GM/865G/915G/915GM/945G/945GM chipsets
intelfb: Version 0.9.4
intelfb: intelfb_setup
intelfb: options: mode=1024x768
intelfb: intelfb_pci_register
intelfb: fb aperture: 0xd0000000/0x10000000, MMIO region: 0xee100000/0x80000
intelfb: Cannot reserve FB region.
intelfb: cleanup

(This is with the same command line as above.)

Regards,

Marcus

[1] http://thread.gmane.org/gmane.linux.fbdev.devel/9264/focus=9285