FirePro v8800 Failure to recognize DisplayPort signal

Submitted by François Jacques

Assigned to Default DRI bug account

Link to original bug (#106191)

Description

Created attachment 139004
callstack from DRM/radeon

DRM/radeon fails with in drm_dp_link_rate_to_bw_code

Driver fails to negotiate video resolution with DP-connected monitor, on any of 4 DP ports.
Controller can drive monitor at 2048x1080 through HDMI adapter. Straight DP cable only works in console (low-res)

Disconnecting power cable from monitor for 5 minutes trick doesn't help ;)

Video controller: FirePro v8800 ChipID 0x6888 (see hardware.txt for details, 4 DPs)
DP monitor: Dell U2717DA
Workstation: HP xw8600
Kernel messages with backtrace: see var_log_messages_excerpt.txt
Max res supported by monitor: 1440p (see Xorg.0.log)

Attachment 139004, "callstack from DRM/radeon":
var_log_messages_excerpt.txt