[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 #22 from HuangRan <huangran at iscas.ac.cn> ---
Hi Kevin,
(In reply to Kevin Brace from comment #19)
> 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.).
IGA should be VIA's display engine(I asked this from VIA's engineer before). As
I worked for RADEON driver, each IGA should has its HW cursor and as you said,
the IGA engine do the HW cursor show/hide/content changing.

> 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.
So can I understand that current UMS driver does not enable HW cursor? So why
not enable SW cursor instead before HW one is working?


Thanks,
Frank

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