[Bug 663642] [NEW] DVI doesn't work at BeagleBoard xM rev A3

[Ricardo Salveti]

Public bug reported:

DVI doesn't turn on when using Maverick at Beagleboard xM rev A3.

>From the list of changes, comparing A2 to A3:
 * Slightly modified PCB layout (Rev B) to correct the following
 * Changed silkscreen on L12 to R159 to reflect the usage of a resistor instead of an inductor. Resistor was used on Rev A2. No electrical difference.
 * Changed routing on R66 and R68 to make them separate paths instead of parallel. No electrical difference.
 * Added 33 ohm resistor R157 in series with MMC clock line. Not used on board, only for expansion. No electrical difference.
 * Added R158 to allow isolation of drain pin on TPS2141. Loaded with zero ohm resistor. No electrical difference.
 * Moved DVI_PUP pin to the TPS65950. No SW impact, however, updated SW can be used to turn of the DVI interface. Electrical change from A2.
 * Added R160 and R155 as a possible future option. Not populated on Rev A3. No electrical difference.
 * Changed R120 to 0603 package to align with arts purchased. No electrical difference.
 * Added R156 to remove the required lifting of U18 pin 4. Resistor is not loaded on Revision A3. No electrical difference.

Checking at the schematics, the DVI_PU is now used and connected to GPIO
2 on TPS65950, so we need to turn on this GPIO in order to have DVI
working again.

ProblemType: Bug
DistroRelease: Ubuntu 10.10
Package: linux-image-2.6.35-22-omap 2.6.35-22.33 [modified: boot/vmlinuz-2.6.35-22-omap]
Regression: No
Reproducible: Yes
ProcVersionSignature: Ubuntu 2.6.35-22.33-omap 2.6.35.4
Uname: Linux 2.6.35-22-omap armv7l
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.23.
AplayDevices:
 **** List of PLAYBACK Hardware Devices ****
 card 0: omap3beagle [omap3beagle], device 0: TWL4030 twl4030-0 []
   Subdevices: 0/1
   Subdevice #0: subdevice #0
Architecture: armel
ArecordDevices:
 **** List of CAPTURE Hardware Devices ****
 card 0: omap3beagle [omap3beagle], device 0: TWL4030 twl4030-0 []
   Subdevices: 1/1
   Subdevice #0: subdevice #0
Date: Wed Oct 20 00:00:51 2010
Lspci:
 Error: command ['lspci', '-vvnn'] failed with exit code 1: pcilib: Cannot open /proc/bus/pci
 lspci: Cannot find any working access method.
ProcCmdLine: quiet splash ro elevator=noop vram=12M omapfb.mode=dvi:1280x720MR-16 at 60 root=UUID=7952bb3d-fbb7-424b-9aa0-a4213602eec4 fixrtc
ProcEnviron:
 LANG=en_US.utf8
 SHELL=/bin/bash
SourcePackage: linux

** Affects: linux (Ubuntu)
     Importance: Undecided
     Assignee: Ricardo Salveti (rsalveti)
         Status: New


** Tags: apport-bug armel kernel-uncat maverick ubuntu-une

-- 
DVI doesn't work at BeagleBoard xM rev A3
https://bugs.launchpad.net/bugs/663642
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