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[Pedric <pedric@xxxxxxxxxxxxxxx>]

Public bug reported:

If you setup a big desktop that spans two monitors, gnome-display-
properties is required to add a Virtual line to the subsection "Display"
in section "screen" of the xorg.conf as generated by aticonfig. If (at
least) the horizontal resolution (maybe the vertical as well) is NOT a
multiple of 64, this will render fglrx unable to report the correct
resolution of either display to xrandr.

For example, for two displays side-by-side with a physical resolution of
1680x1050 each, gnome-display-properties will insert:

                Virtual   3360 1050

however, after logging off and on, xrandr will no longer report
1680x1050 as a valid resolution (missing from xrandr -q and consequently
in the gnome-display-properties ui) for either display unless you
increase the virtual resolution to a multiple of 64:

                Virtual   3392 3392

This is on a Lenovo ThinkPad T500, using the integrated display and
DisplayPort output.

Steps to reproduce this:
a) initiate xorg.conf using sudo aticonfig --initial (if not done already by fglrx-installer; move your own customized xorg.conf away if present)
b) log off and on again, make sure you are running fglrx using fglrxinfo and that xrandr -q reports the correct physical resolution of your integrated/primary display
c) connect external/secondary display
d) make sure xrandr -q reports correct physical resolution of external display
e) go to gnome-display-properties, untick clone mode, put displays side-by-side, apply (or do that using xrandr parameters)
d) agree to the suggestion that a Virtual line needs to be added to your xorg.conf to accomodate for the larger desktop area
e) log off, log on

expected behaviour:
gnome-display-properties (or xrandr) should now be able to put the two displays in big/extended desktop mode side-by-side with their corresponding physical resolutions

actual behaviour:
xrandr does no longer detect the correct physical resolution of either display.

** Affects: fglrx-installer (Ubuntu)
     Importance: Undecided
         Status: New

** Description changed:

  If you setup a big desktop that spans two monitors, gnome-display-
  properties is required to add a Virtual line to the subsection "Display"
  in section "screen" of the xorg.conf as generated by aticonfig. If (at
  least) the horizontal resolution (maybe the vertical as well) is NOT a
  multiple of 64, this will render fglrx unable to report the correct
  resolution of either display to xrandr.
  
  For example, for two displays side-by-side with a physical resolution of
  1680x1050 each, gnome-display-properties will insert:
  
                  Virtual   3360 1050
  
  however, after logging off and on, xrandr will no longer report
  1680x1050 as a valid resolution (missing from xrandr -q and consequently
  in the gnome-display-properties ui) for either display unless you
  increase the virtual resolution to a multiple of 64:
  
                  Virtual   3392 3392
  
  This is on a Lenovo ThinkPad T500, using the integrated display and
  DisplayPort output.
  
  Steps to reproduce this:
- a) initiate xorg.conf using sudo aticonfig --initial (if not done already be fglrx-installer; move your own customized xorg.conf away if present)
+ a) initiate xorg.conf using sudo aticonfig --initial (if not done already by fglrx-installer; move your own customized xorg.conf away if present)
  b) log off and on again, make sure you are running fglrx using fglrxinfo and that xrandr -q reports the correct physical resolution of your integrated/primary display
  c) connect external/secondary display
  d) make sure xrandr -q reports correct physical resolution of external display
  e) go to gnome-display-properties, untick clone mode, put displays side-by-side, apply (or do that using xrandr parameters)
  d) agree to the suggestion that a Virtual line needs to be added to your xorg.conf to accomodate for the larger desktop area
  e) log off, log on
  
  expected behaviour:
  gnome-display-properties (or xrandr) should not be able to put the two displays in big/extended desktop mode side-by-side with their corresponding physical resolutions
  
  actual behaviour:
  xrandr does no longer detect the correct physical resolution of either display.

** Description changed:

  If you setup a big desktop that spans two monitors, gnome-display-
  properties is required to add a Virtual line to the subsection "Display"
  in section "screen" of the xorg.conf as generated by aticonfig. If (at
  least) the horizontal resolution (maybe the vertical as well) is NOT a
  multiple of 64, this will render fglrx unable to report the correct
  resolution of either display to xrandr.
  
  For example, for two displays side-by-side with a physical resolution of
  1680x1050 each, gnome-display-properties will insert:
  
                  Virtual   3360 1050
  
  however, after logging off and on, xrandr will no longer report
  1680x1050 as a valid resolution (missing from xrandr -q and consequently
  in the gnome-display-properties ui) for either display unless you
  increase the virtual resolution to a multiple of 64:
  
                  Virtual   3392 3392
  
  This is on a Lenovo ThinkPad T500, using the integrated display and
  DisplayPort output.
  
  Steps to reproduce this:
  a) initiate xorg.conf using sudo aticonfig --initial (if not done already by fglrx-installer; move your own customized xorg.conf away if present)
  b) log off and on again, make sure you are running fglrx using fglrxinfo and that xrandr -q reports the correct physical resolution of your integrated/primary display
  c) connect external/secondary display
  d) make sure xrandr -q reports correct physical resolution of external display
  e) go to gnome-display-properties, untick clone mode, put displays side-by-side, apply (or do that using xrandr parameters)
  d) agree to the suggestion that a Virtual line needs to be added to your xorg.conf to accomodate for the larger desktop area
  e) log off, log on
  
  expected behaviour:
- gnome-display-properties (or xrandr) should not be able to put the two displays in big/extended desktop mode side-by-side with their corresponding physical resolutions
+ gnome-display-properties (or xrandr) should now be able to put the two displays in big/extended desktop mode side-by-side with their corresponding physical resolutions
  
  actual behaviour:
  xrandr does no longer detect the correct physical resolution of either display.

-- 
[fglrx] fails to detect correct resolution with non-multiple of 64 virtual desktop area
https://bugs.launchpad.net/bugs/659205
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