[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 #30 from Kevin Brace <kevinbrace at gmx.com> ---
(In reply to caozong from comment #25)

Hi Zong,

> Hi Eric,
>   Recently, i've been trying to confirm this bug on Wyse V90LE. I installed
> Lubuntu-12.04-desktop with the default kernel 3.2.0-23-generic. The monitor
> is G225HQV (DVI to VGA). I've tried some version of ddx(including revision
> 8bc53d8 and revision d951436 in your logs). In older versions before
> revision 7a98f65(Using I2C bus 2 to detect a VGA monitor), VGA doesn't work.
> But in later versions(like release 0.4.0), VGA works and cursor shows up.
> Then i added some debug info in some functions to print the register value
> of Hardware Icon(VIAGETREG(PRIM_HI_POSSTART)). And it turns out that
> HWCursor works fine.

As I have explained here, I think I know the reason why DVI to VGA "broke" with
Eric's system setup, and the regression was unintentional.
Of course, I did fix the bug before OpenChrome Version 0.4.0 release as you
have correctly observed.
In general, the hardware cursor works with all UniChrome Pro or later VIA IGP
hardware.
For UniChrome IGP (pre-UniChrome Pro; CLE266, KM400(A), KN400, and P4M800),
OpenChrome appears to be using a software cursor, and there appears to be a
mouse cursor rendering bug with Lubuntu 10.04 (Ubuntu 10.04 LTS and Lubuntu
12.04 are okay).
UniChrome Pro or later IGPs are not affected by this bug even in Lubuntu 10.04.
Eventually, I plan to fix this bug.

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