Created attachment 59545 [details] [review] dmesg Hi. One of my monitors is a VGA LCD connected over DisplayPort. After startup not all resolutions are detected but only resolutions up to 1024x768. However if i disconnect the monitor and reconnect it again (at 287.472381 in the log file) all screen resolutions are detected correctly. The initial detection does not work and dmesg shows "[drm:radeon_dp_i2c_aux_ch], aux i2c too many retries, giving up" error messages. drm_helper_probe_single_connector_modes() then falls back and probes some modes up to 1024x768 that is why higher resolutions are missing. No idea why it works after reconnecting the monitor. dmesg log is "dmesg | grep drm" with drm.debug=0x0e from a 3.4-rc1 kernel but the problem already happend in earlier versions. The problem also happens if only the VGA monitor is connected.
This bug is finally fixed for me with kernel 3.15.
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