Antonino Daplas wrote:

quoted

quoted

2. do not refresh unless var changed - fasted but can result in
corruption/crash if registers were changed behind the back of fbdev

I think one can rely on tidyness of applications changing the registers. 
Like X does.

 
Unfortunately, this is what we are trying to prevent.  X assumes that
the console is in text mode, so only registers that affect text mode are
restored.  Frequently, cursor registers and bitmaps, as an example, are
not refreshed.  There's probably more, ie accel engine, etc.

That surprises me. The X drivers I looked at (quite a bunch) restore all 
registers (that need to be restored, that is)

quoted

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3. selective refresh - do not refresh if switching between "trusted"
consoles, refresh if switching from "untrusted" consoles.

I actually prefer #3, and I already have working code for this.  We can
also make this driver switchable (ie, drivers that are not affected by X
can disable this, and only drivers that are affected such as the riva,
aty, radeon, etc can turn this on).

What exactly is a "trusted" console?

Thomas


-- 
Thomas Winischhofer
Vienna/Austria
mailto:thomas@winischhofer.net          *** http://www.winischhofer.net



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