[Bug 460471] [NEW] unable to read edid information

[Pieter H]

Public bug reported:

Binary package hint: read-edid

1) lsb_release -rd
Description:    Ubuntu 9.04
Release:        9.04

2) apt-cache policy read-edid
read-edid:
  Installed: 1.4.1-2.1ubuntu1
  Candidate: 1.4.1-2.1ubuntu1
  Version table:
 *** 1.4.1-2.1ubuntu1 0
        500 http://us.archive.ubuntu.com jaunty/universe Packages
        100 /var/lib/dpkg/status

3) i expected to be able to read the edid information from my monitor
:-)

4) with version 1.4.1-2.1 i had a segmentation fault. I tracked this down into a call to lrmi_vm86.
Then i tried to get the latest source package available and got "Source Package: read-edid (2.0.0-2) [universe]" for karmic.
After installing libx86-dev i configured the sources and made the executables. This time i could get a little bit further. This was due to switching to libx86. However i still am not able to get the edid information. I get the following output:
/get-edid: get-edid version 2.0.0

        Performing real mode VBE call
        Interrupt 0x10 ax=0x4f00 bx=0x0 cx=0x0
        Function supported
        Call successful

        VBE version 300
        VBE string at 0x2110 "NVIDIA"

VBE/DDC service about to be called
        Report DDC capabilities

        Performing real mode VBE call
        Interrupt 0x10 ax=0x4f15 bx=0x0 cx=0x0
        Function supported
        Call successful

        Monitor and video card combination does not support DDC1 transfers
        Monitor and video card combination supports DDC2 transfers
        0 seconds per 128 byte EDID block transfer
        Screen is not blanked during DDC transfer

Reading next EDID block

VBE/DDC service about to be called
        Read EDID

        Performing real mode VBE call
        Interrupt 0x10 ax=0x4f15 bx=0x1 cx=0x0
        Function supported
        Call failed

The EDID data should not be trusted as the VBE call failed
<<here was some binary data>>

information about my system:
graphics card:
lspci|grep VGA
01:00.0 VGA compatible controller: nVidia Corporation GeForce 8500 GT (rev a1)

monitor:
Apple Cinema Display 23 inch

** Affects: read-edid (Ubuntu)
     Importance: Undecided
         Status: New

-- 
unable to read edid information
https://bugs.launchpad.net/bugs/460471
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