[Bug 17902] [830M missing dvo driver] need support for DVO-LVDS via na2501

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=17902

--- Comment #82 from thor at math.tu-berlin.de 2012-06-03 10:35:15 PDT ---
Got a step further. What one can do to get a stable picture is simply to
disable the scaler.

For this, insert: in dvo_ns2501.c, in the function

static void ns2501_mode_set

the following line:

  ns2501_writeb(dvo, 0x08, NS2501_8_PD | NS2501_8_BPAS | NS2501_8_VEN |
NS2501_8_HEN);

ns2501_dpms should also et the NS2501_8_BPAS bit.

Voila, I get a stable console at boot-up, and a 2D desktop. However, something
still seems to be seriously broken outside of the control of the DVO driver. As
soon as I start an X session, or a 3D application like tuxracer, the display
vanishes. At that point, the DVO also vanishes from the i2c bus for reasons
unclear to me. A vbetool post restores the i2cbus.

So at least there seems to be something seriously broken with the i2c
communication on this board.

It also happenes that I could start the desktop, but something was wrong with
EXA as characters were printed on top of each other (overlayed) instead of
erased properly. glxgears seemed to work (at least once).

So what is it with the i2c bus on this system?

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