[Bug 64583] New: [regression] Xv vsync not working after disabling monitor

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=64583

          Priority: medium
            Bug ID: 64583
          Assignee: xorg-driver-ati at lists.x.org
           Summary: [regression] Xv vsync not working after disabling
                    monitor
        QA Contact: xorg-team at lists.x.org
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: thomas.lindroth at gmail.com
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: unspecified
         Component: Driver/Radeon
           Product: xorg

Steps to reproduce this bug:
Boot a system with two monitors connected using HDMI & DVI on an HD6770 card.
Run a dual head setup in xorg without using composition (xrandr output below).
At this point vsync in xv works on both monitors. Disable the HDMI monitor by
xrandr --output HDMI-0 --off. Xvideos on the DVI monitor are now not vsynced.
Reenable the HDMI with xrandr --output HDMI-0 --auto --output DVI-1 --auto
--right-of HDMI-0. After that xv vsync doesn't work on any of the monitors.
xvattr show XV_VSYNC is 1. After an unknown amount of time vsync will start
working again. It takes a few hours like leaving it over night.

I usually disable the HDMI monitor because I'm unplugging it. After unplugging
it an error message will show up in syslog:

[drm:drm_edid_block_valid] *ERROR* EDID checksum is invalid, remainder is 216
Raw EDID:
    00 ff ff ff ff ff ff 00 1e 6d 57 56 59 a6 00 00
    01 12 01 03 80 34 20 78 ea 5a d5 a7 56 4b 9b 24
    13 50 54 a5 4b 00 a9 40 81 8f b3 00 81 4f 81 80
    01 01 01 01 01 01 28 3c 80 a0 70 b0 23 40 30 20
    36 00 b0 44 11 00 00 1a 48 3f 40 30 62 b0 32 40
    40 c1 ff ff ff ff ff ff ff ff ff ff ff ff ff ff
    ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
    ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[drm:radeon_dvi_detect] *ERROR* HDMI-A-1: probed a monitor but no|invalid EDID

I don't know if this error is related to the vsync problem but they started at
about the same time. Unplugging the monitor is not required for the vsync
problem.

Looking at timestamps in syslog I upgraded xf86-video-ati from 7.0.0 to 7.1.0
and the kernel from 3.7.5 to 3.8.0 a few days before the first EDID checksum is
invalid message. I should bisect but bisecting the DDX is a pita.

xorg.conf only got a section with
Identifier      "ATI"
Driver          "radeon"
Option "ColorTiling" "true"
Option "ColorTiling2D" "true"
Option "SwapbuffersWait" "false"
Option "EnablePageFlip" "true"


Screen 0: minimum 320 x 200, current 3600 x 1200, maximum 8192 x 8192
DisplayPort-0 disconnected (normal left inverted right x axis y axis)
HDMI-0 connected 1920x1200+0+0 (normal left inverted right x axis y axis) 432mm
x 324mm
   1920x1200      60.0*+
   1920x1080      50.0     60.0     50.0  
   1920x1080i     25.0     30.0  
   1600x1200      60.0  
   1680x1050      59.9  
   1280x1024      75.0     60.0  
   1280x960       75.0  
   1280x720       50.0     60.0  
   1024x768       75.1     60.0  
   800x600        75.0     60.3  
   720x576        50.0  
   720x480        59.9     59.9  
   640x480        75.0     60.0     59.9  
   720x400        70.1  
DVI-0 disconnected (normal left inverted right x axis y axis)
DVI-1 connected 1680x1050+1920+0 (normal left inverted right x axis y axis)
434mm x 270mm
   1680x1050      60.0*+
   1280x1024      75.0     60.0  
   1280x960       60.0  
   1152x864       75.0  
   1024x768       75.1     60.0  
   832x624        74.6  
   800x600        75.0     60.3     56.2  
   640x480        75.0     60.0  
   720x400        70.1

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