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[Julien Villemure <phunkatic@xxxxxxxxxxx>]

** Attachment added: "output of dmesg"
   https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-ati/+bug/1375486/+attachment/4219659/+files/dmesg.txt

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https://bugs.launchpad.net/bugs/1375486

Title:
  Blank screen when monitor is turned on after boot

Status in “xserver-xorg-video-ati” package in Ubuntu:
  New

Bug description:
  - System:

  Ubuntu 14.04.1 amd64 (freshly installed from scratch)
  Kernel 3.13.0-24-generic #47-Ubuntu SMP
  Radeon HD 5450 sending video and audio via HDMI to an A/V receiver, which itself is connected via HDMI to a TV.

  - Steps to reproduce:

  1) With the computer off, turn on the receiver and the TV
  2) Boot computer
  3) The login screen appears correctly, everything's fine.
  4) Turn off receiver
  5) Turn on receiver
  6) Blank screen and no sound.
  7) I am able to switch to the TTYs by pressing e.g. Ctrl-Alt-F1, but if I try to go back to my X session by pressing Ctrl-Alt-F7, it's still on the blank screen.

  My setup is functional with other devices (PS3, Windows) and worked
  fine with Ubuntu 13.10. This is a new problem in Ubuntu 14.04.1.

  - Workaround:
  restart lightdm

  - Logs:
  Xorg.0.log
  dmesg.txt

  Near the bottom of dmesg.txt there are errors regarding EDID:

  [   43.320174] radeon 0000:01:00.0: HDMI-A-1: EDID block 0 invalid.
  [   43.320179] [drm:radeon_dvi_detect] *ERROR* HDMI-A-1: probed a monitor but no|invalid EDID
  [   48.554222] [drm:drm_edid_block_valid] *ERROR* EDID checksum is invalid, remainder is 226
  [   49.962580] [drm:radeon_dvi_detect] *ERROR* HDMI-A-1: probed a monitor but no|invalid EDID

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