[Nouveau] [Bug 30086] New: Nouveau fails with unreadable EDID

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=30086

           Summary: Nouveau fails with unreadable EDID
           Product: xorg
           Version: unspecified
          Platform: x86-64 (AMD64)
        OS/Version: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/nouveau
        AssignedTo: nouveau at lists.freedesktop.org
        ReportedBy: alci at mecadu.org
         QAContact: xorg-team at lists.x.org


On a Sony VPCCW2S1E laptop, EDID seems to be somehow unreadable:

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 0x11100 "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 does not support 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
Error: output block unchanged


Video card is a GT 330 M:

01:00.0 VGA compatible controller: nVidia Corporation GT216 [GeForce GT 330M]
(rev a2) (prog-if 00 [VGA controller])
    Subsystem: Sony Corporation Device 9072
    Flags: bus master, fast devsel, latency 0, IRQ 16
    Memory at e2000000 (32-bit, non-prefetchable) [size=16M]
    Memory at d0000000 (64-bit, prefetchable) [size=256M]
    Memory at e0000000 (64-bit, prefetchable) [size=32M]
    I/O ports at d000 [size=128]
    Expansion ROM at e3000000 [disabled] [size=512K]
    Capabilities: <access denied>
    Kernel driver in use: nvidia
    Kernel modules: nvidia-current, nouveau, nvidiafb


When loading, nouveau driver can't find the laptop's LCD screen, and display is
black.
Notice that proprietary NVidia driver has the same problem, but it offers a
workaround with the customEDID option:

Option "CustomEDID" "DFP-0:/etc/X11/SNY05FA.bin"


Nouveau does not seem to have such an option... Is there a workaround for
nouveau? Or is there a way to find why the EDID cannot be read?

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