Dave> Just for kicks, I removed xorg.conf completely. The Xorg.0.log
Dave> files produced were barely different: the changes mostly have to
Dave> do with autodetection of Default Screen and loss of Monitor
Dave> sections. Interestingly, the removal of the Monitor sections
Dave> causes this change in the Xorg.0.log output:
Dave> -(**) RADEON(0): Display dimensions: (593, 371) mm
Dave> -(**) RADEON(0): DPI set to (82, 82)
Dave> +(==) RADEON(0): DPI set to (96, 96)
Dave> The first two lines are expected, since I removed the monitor section
Dave> that specified the physical size of the monitor. The line replacing
Dave> them ought to be indicating a DPI of 82 since the correct resolution and
Dave> screen size are detected:
Dave> (II) RADEON(0): clock: 154.0 MHz Image Size: 593 x 371 mm
Dave> Instead, either the radeon driver or the X server is altering the
Dave> physical screen size to this:
Dave> (II) RADEON(0): Setting screen physical size to 508 x 317
Dave> This also happens with my HD 4850 (even with my old xorg.conf
Dave> being used) if I use the DVI-to-HDMI converter cable. With the
Dave> new HDMI cable being used (on HD 4850), I get the correct
Dave> physical size: 593x371.
Dave> Baffling....
Not really, look at the change in DPI. I bet that's the difference
between the 82 and 96 DPI settings.
Actually, that was my point. If I use my current xorg.conf, which
contains information identical to what the X server autodetects about
the monitor (plus some custom DPMS settings), I get the correct, desired
DPI of 82. If I remove xorg.conf, the X server detects all of the same
info about the monitor (minus the custom DPMS settings), but alters the
physical size data for some reason and give me the incorrect, undesired
DPI of 96.
As I mentioned to Alex Deucher, even leaving my own xorg.conf in place
with the HD 4850:
1. Using DVI-to-HDMI causes X to alter the physical size, resulting in
96 DPI.
2. Using the HDMI cable causes X to use the correct physical size,
giving me 82 DPI.
Still baffling (to me).
Dave W.
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