[Bug 538377] [NEW] HD3450 HDMI output intermittently turns off

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Binary package hint: xserver-xorg-video-ati

1) lsb_release -rd
Description:	Ubuntu lucid (development branch)
Release:	10.04

2) apt-cache policy xserver-xorg-video-radeon
xserver-xorg-video-radeon:
  Installed: 1:6.12.191+git20100306.e7b41f8c-0ubuntu0sarvatt
  Candidate: 1:6.12.191+git20100306.e7b41f8c-0ubuntu0sarvatt
  Version table:
 *** 1:6.12.191+git20100306.e7b41f8c-0ubuntu0sarvatt 0
        500 http://ppa.launchpad.net lucid/main Packages
        100 /var/lib/dpkg/status
     1:6.12.191-1ubuntu2 0
        500 http://archive.ubuntu.com lucid/main Packages

3) The HD3450 DVI-HDMI output is connected by HDMI cable to an ASUS
MK241H monitor.  It should provide a 1920x1200 display + audio via the
monitor.  When it does so, xrandr reports:

xrandr -q
Screen 0: minimum 320 x 200, current 1920 x 1200, maximum 8192 x 8192
DIN disconnected (normal left inverted right x axis y axis)
VGA-0 disconnected (normal left inverted right x axis y axis)
DVI-0 connected 1920x1200+0+0 (normal left inverted right x axis y axis) 518mm x 324mm
   1920x1200      60.0*+
   1920x1080      60.0  
   1600x1200      60.0  
   1680x1050      60.0  
   1600x1024      60.2  
   1400x1050      70.0     60.0     60.0  
   1280x1024      75.0     60.0  
   1440x900       75.0     59.9  
   1280x960       60.0  
   1360x765       59.8  
   1360x768       60.0     59.8  
   1280x800       74.9     59.8  
   1152x864       75.0     75.0     70.0     60.0  
   1280x768       74.9     59.9  
   1280x720       60.0  
   1024x768       75.1     75.0     70.1     60.0  
   832x624        74.6  
   800x600        72.2     75.0     60.3     56.2  
   720x576        50.0  
   848x480        60.0  
   720x480        59.9  
   640x480        75.0     72.8     72.8     72.8     75.0     60.0     59.9     59.9  
   720x400        70.1  


4) The display generally starts fine, but intermittently, after apparently random times and with random programs running, the display turns off and the monitor reports no HDMI output.  Logging in from another machine, everything appears to be normal and xrandr reports the same as above.  However, there is no HDMI output to the monitor.  This can be fixed by xrandr, using first:

xrandr -d :0 --output DVI-0 --mode 1024x768

which makes the display visible again, in the lower resolution, then

xrandr -d :0 --output DVI-0 --mode 1920x1200

which restores the original display.  Things then function normally
until the next random HDMI output failure.

** Affects: xserver-xorg-driver-ati
     Importance: Unknown
         Status: Confirmed

** Affects: linux (Ubuntu)
     Importance: Medium
         Status: New


** Tags: lucid tv-out xorg-needs-kernel-fix
-- 
HD3450 HDMI output intermittently turns off
https://bugs.edge.launchpad.net/bugs/538377
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