[Bug 73530] Asus U38N: Black screen with Radeon driver in Linux 3.10, 3.11 and 3.12

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=73530

--- Comment #52 from Paul Menzel <paulepanter at users.sourceforge.net> ---
Created attachment 93042
  --> https://bugs.freedesktop.org/attachment.cgi?id=93042&action=edit
`/var/log/kern.log` from 3.13 with debug and delay patch

Here are the errors.

    [  297.778990] [drm:radeon_dp_link_train], Before train_cr
    [  297.794470] [drm:radeon_process_aux_ch], dp_aux_ch timeout
    [  297.796597] [drm:radeon_dp_get_link_status], link status 00 00 80 00 00
00
    [  297.796604] [drm:dp_get_adjust_train], requested signal parameters: lane
0 voltage 0.4V pre_emph 0dB
    [  297.796609] [drm:dp_get_adjust_train], using signal parameters: voltage
0.4V pre_emph 0dB
    [  297.798313] [drm:radeon_dp_get_link_status], link status 00 00 00 00 00
00
    [  297.798318] [drm:dp_get_adjust_train], requested signal parameters: lane
0 voltage 0.4V pre_emph 0dB
    [  297.798322] [drm:dp_get_adjust_train], using signal parameters: voltage
0.4V pre_emph 0dB
    [  297.800044] [drm:radeon_dp_get_link_status], link status 00 00 00 00 00
00
    [  297.800048] [drm:dp_get_adjust_train], requested signal parameters: lane
0 voltage 0.4V pre_emph 0dB
    [  297.800052] [drm:dp_get_adjust_train], using signal parameters: voltage
0.4V pre_emph 0dB
    [  297.801762] [drm:radeon_dp_get_link_status], link status 00 00 00 00 00
00
    [  297.801766] [drm:dp_get_adjust_train], requested signal parameters: lane
0 voltage 0.4V pre_emph 0dB
    [  297.801770] [drm:dp_get_adjust_train], using signal parameters: voltage
0.4V pre_emph 0dB
    [  297.803490] [drm:radeon_dp_get_link_status], link status 00 00 00 00 00
00
    [  297.803494] [drm:dp_get_adjust_train], requested signal parameters: lane
0 voltage 0.4V pre_emph 0dB
    [  297.803496] [drm:dp_get_adjust_train], using signal parameters: voltage
0.4V pre_emph 0dB
    [  297.805187] [drm:radeon_dp_get_link_status], link status 00 00 00 00 00
00
    [  297.805190] [drm:radeon_dp_link_train_cr] *ERROR* clock recovery tried 5
times
    [  297.805194] [drm:radeon_dp_link_train_cr] *ERROR* clock recovery failed

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