Hi Tony,

thanks for the quick reply.

Try this patch.

fb_save_state() will be called when going from KD_GRAPHICS to KD_TEXT. The
driver has the opportunity here to save the current state of the hardware
before it's touched by fbdev.
fb_restore_state() will be called when going from KD_TEXT to KD_GRAPHICS
mode.  The driver has the opportunity to set the hardware back to something
recognizable by the graphics application.
 

Are you sure? I added a save_state and restore_state function to 
cyblafb, both
including nothing but a printk and return. I also added a printk at the 
start of
both the check_var and set_par functions of cyblafb. The "Scrollmode= 
..." lines
originate from a printk in updatescrollmode:

Loading of cyblafb and switching to it using the following commands:

    echo -n "0" > /sys/class/graphics/fb0/con_rotate
    echo -n "0" > /sys/class/graphics/fb1/con_rotate
    con2fb /dev/fb0 /dev/tty1
    rmmod cyblafb
    sync
    modprobe cyblafb scalign=4
    con2fb /dev/fb1 /dev/tty1
    echo -n "0" > /sys/class/graphics/fb0/con_rotate
    echo -n "0" > /sys/class/graphics/fb1/con_rotate
    setfont ~/lat9w-16.psfu.gz
    rcgpm restart
    echo -e '\033[?2c'

dmesg output:

    [ 4910.034508] cyblafb: CyblaFB version 0.55 normal exit.
    [ 4910.086590] cyblafb: CyblaFB version 0.55 initializing
    [ 4910.088746] cyblafb: Pixmap size = 8188, alignement = 4
    [ 4910.090688] ACPI: PCI Interrupt 0000:01:00.0[A] -> Link [LNKA] -> 
GSI 11 (level, low) -> IRQ 11
    [ 4910.094348] cyblafb: region 0x3c0/0x20 already reserved
    [ 4910.096321] cyblafb: region 0xe1800000/0x800000 already reserved
    [ 4910.098374] cyblafb: check_var
    [ 4910.106050] cyblafb: set_par
    [ 4910.108224] Scrollmode = SCROLL_PAN_MOVE
    [ 4910.121050] Scrollmode = SCROLL_PAN_MOVE
    [ 4910.138671] Scrollmode = SCROLL_PAN_MOVE
    [ 4910.138763] Scrollmode = SCROLL_PAN_MOVE
    [ 4910.180336] Scrollmode = SCROLL_PAN_MOVE

now switching to X:

    [ 4921.533936] Scrollmode = SCROLL_PAN_REDRAW

now switching back to framebuffer console:

    [ 4929.167382] cyblafb: set_par
    [ 4929.169506] Scrollmode = SCROLL_PAN_MOVE
    [ 4929.181895] cyblafb: save_state has been called, switching from 
KD_GRAPHICS to KD_TEXT
    [ 4929.181917] cyblafb: check_var
    [ 4929.181929] cyblafb: set_par
    [ 4929.184695] Scrollmode = SCROLL_PAN_MOVE

no switching to X again:

    [ 4933.273261] Scrollmode = SCROLL_PAN_REDRAW

1. restore_state is never called
2. there is a set_par prior to the call to save_state, but that´s 
irrelevant for me as
    there is a check_var and set_par call after save_state.

cu,
 Knut


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