[Bug 75491] New: radeon 0000:05:00.0: Invalid ROM contents (Radeon HD7750 no Monitors connected)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=75491

          Priority: medium
            Bug ID: 75491
          Assignee: dri-devel at lists.freedesktop.org
           Summary: radeon 0000:05:00.0: Invalid ROM contents (Radeon
                    HD7750 no Monitors connected)
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: freedesktop at donewell.de
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: unspecified
         Component: DRM/Radeon
           Product: DRI

Created attachment 94711
  --> https://bugs.freedesktop.org/attachment.cgi?id=94711&action=edit
bios_dump

I've bought a radeon HD 7750 with 4 mini-DP Connectors and use passive hdmi
adapters to connect my 3 Monitors.

kernel version is 3.13.5

on bootup kernel reports:

Feb 25 10:42:32 barfoos24 kernel: radeon 0000:05:00.0: Invalid ROM contents
Feb 25 10:42:32 barfoos24 kernel: ATOM BIOS: C44501

After init of drm the montiors goto black.

After reading a lot i managed to get them working by following kernel params:

radeon.modeset=1 radeon.dpm=1 video=DP-1:1920x1200-24 at 60D
video=DP-2:1920x1200-24 at 60D video=DP-3:1920x1200-24 at 60D
rm_kms_helper.edid_firmware=edid/1920x1200.bin

edid/1920x1200.bin is self compiled edid.

i've attached the dumped bios.

in this configuration the card is working with all 3 monitors, but after
screenlog or a console change the screens remain dark.

the kernel log reads:

Feb 25 10:44:01 barfoos24 kernel: [drm:radeon_dp_link_train_cr] *ERROR* clock
recovery failed
Feb 25 10:44:01 barfoos24 kernel: [drm:radeon_dp_link_train_cr] *ERROR*
displayport link status failed
Feb 25 10:44:01 barfoos24 kernel: [drm:radeon_dp_link_train_cr] *ERROR* clock
recovery failed
Feb 25 10:44:01 barfoos24 kernel: [drm:radeon_dp_link_train_cr] *ERROR*
displayport link status failed
Feb 25 10:44:01 barfoos24 kernel: [drm:radeon_dp_link_train_cr] *ERROR* clock
recovery failed
Feb 25 10:44:01 barfoos24 kernel: [drm:radeon_dp_link_train_cr] *ERROR*
displayport link status failed

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