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On 2009-06-05T00:29:20+00:00 Leio-gentoo wrote:

Since the RANDR1.2 port in xf86-video-geode-2.11 the driver crashes on
X.org startup immediately if the firmware has set up the DDC/UART muxed
GPIO to serial port (UART) mode.

Before there was code made to detect the GPIO mode and not do any DDC
queries if it is in serial port mode. But while that checking still
exists and the fact that it is in UART mode gets reported in Xorg.0.log,
DDC calls are still made through RANDR impementation vfunc regardless of
that, and Xorg crashes on the results that gets to in UART mode.

This bug is the primary reason 2.11 is not packaged in Gentoo Linux yet,
as it breaks things for my own geode platform development :(

Reply at: https://bugs.launchpad.net/xorg-server/+bug/873942/comments/0

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On 2010-04-20T02:34:49+00:00 Leio-gentoo wrote:

A workaround is Option "NoDDC" in xorg.conf. Probably just need to add some checks in the right place of the randr1.2 interface implementation to not call into EDID xserver code when we have figured out we are in serial mode.
(and 2.11 series has been packaged in gentoo for quite a long while now)

Reply at: https://bugs.launchpad.net/xorg-server/+bug/873942/comments/1

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On 2010-08-23T16:24:57+00:00 Martin-Éric Racine wrote:

Does this bug still apply to Geode 2.11.9 or not?

Reply at: https://bugs.launchpad.net/xorg-server/+bug/873942/comments/2

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On 2010-10-27T07:53:08+00:00 Martin-Éric Racine wrote:

AMD might be willing to fix this, since this involves a standard Geode
feature, but additional details might need to be provided to this bug
report.

Reply at: https://bugs.launchpad.net/xorg-server/+bug/873942/comments/3

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On 2010-11-05T20:18:25+00:00 Martin-Éric Racine wrote:

One solution could be to make our driver bit-bang the GPIO into DDC
mode, early in the driver startup pahse, to ensure that DDC probing will
always work.

Reply at: https://bugs.launchpad.net/xorg-server/+bug/873942/comments/4

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On 2011-01-04T07:14:59+00:00 Priit Laes wrote:

The crash only happens on LX hardware.

Reply at: https://bugs.launchpad.net/xorg-server/+bug/873942/comments/5

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On 2011-01-10T11:53:30+00:00 Martin-Éric Racine wrote:

LX hardware happens to be the majority of what's left of the Geode
market.

Reply at: https://bugs.launchpad.net/xorg-server/+bug/873942/comments/6


** Changed in: xorg-server
       Status: Unknown => Confirmed

** Changed in: xorg-server
   Importance: Unknown => Medium

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https://bugs.launchpad.net/bugs/873942

Title:
  xf86-video-geode: driver initialization fails on Geode LX if DDC pins
  are configured for serial console

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