[Openchrome-devel] [Bug 94259] No mouse cursor (invisible) with dual monitors and DVI/VGA "Y" cable, no display on DVI

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=94259

--- Comment #19 from Kevin Brace <kevinbrace at gmx.com> ---
Hi Eric,

I think I have some explanations on why the cursor does not show up on your
screen.
The way VIA Technologies Chrome family of IGP (Integrated Graphics Processor)
works is that it contains 2 display controllers internally.
They call this IGA1 and IGA2 (I do not know what IGA stands for.).
Most likely what is going on is that OpenChrome is not really using one of the
display controller, but the display controller is still functioning.
What this means is that the display controller hardware is still running, but
because OpenChrome is not really using this display controller, it is not
turning on the hardware cursor.
The hardware cursor has to be actively managed by OpenChrome like determining
the X and Y coordinate on the screen.
    Previously, I have been fairly reluctant to make extensive code changes due
to the fact that OpenChrome has had many lines of "legacy" code that did not
have to be there (i.e., known device table, legacy user mode setting, and VBE
mode setting).
Now that stuff is gone, and I have a freer hand in adding more lines of code
that does something useful.
It might take a while until the issue can be resolved to your satisfaction, so
please be patient.

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