Re: [PATCH 1/1 2.6.15-rc4-git1] Fixing switch to KD_TEXT, enhanced version

Knut Petersen wrote:

Every framebuffer driver relies on the assumption that the
set_par() function of the driver is called before drawing
functions and other functions dependent on the hardware
state are executed.

Whenever you switch from X to a framebuffer console for the
very first time, there is a chance that a broken X system has
_not_ set the mode to KD_GRAPHICS, thus the vt and framebuffer
code executes a screen redraw and several other functions
before a set_par() is executed. This is believed to be not a
bug of linux but a bug of X/xdm. At least some X releases
used by SuSE and Debian show this behaviour.

There was a 2nd case, but that has been fixed by Antonino
Daplas on 10-dec-2005.

This patch allows drivers to set a flag to inform fbcon_switch()
that they prefer a set_par() call on every console switch,
working around the problems caused by the broken X releases.

The flag will be used by the next release of cyblafb and might
help other drivers that assume a hardware state different to
the one used by X.

As the default behaviour does not change, this patch should
be acceptable to everybody.

Signed-off-by: Knut Petersen <redacted>

Acked-by: Antonino Daplas <redacted>

+#define FBINFO_MISC_ALLWAYS_SETPAR   0x40000

                       ^^^^^^^
Please post a follow up patch to fix the spelling.

Tony


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