Nouveau - May 2008 - [Bug 16033] New: [Randr12] DPI calculation ludicrously incorrect

http://bugs.freedesktop.org/show_bug.cgi?id=16033

           Summary: [Randr12] DPI calculation ludicrously incorrect
           Product: xorg
           Version: git
          Platform: x86-64 (AMD64)
        OS/Version: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/nouveau
        AssignedTo: nouveau at lists.freedesktop.org
        ReportedBy: chalserogers at gmail.com
         QAContact: xorg-team at lists.x.org


Created an attachment (id=16646)
 --> (http://bugs.freedesktop.org/attachment.cgi?id=16646)
Xorg log, showing DPI set to (230, 254)

It seems that the DPI calculation is using the Virtual line to calculate the
DPI.  Since this is substantially larger than my laptop's screen resolution
this results in a DPI value slightly under double the true DPI!

This may well not be a nouveau bug; I've had a grep through the source and
it
seems that nouveau is just setting the DPI received from the server.


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http://bugs.freedesktop.org/show_bug.cgi?id=16033


Frans Pop <elendil at planet.nl> changed:

           What    |Removed                     |Added
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                 CC|                            |elendil at planet.nl




--- Comment #1 from Frans Pop <elendil at planet.nl>  2008-08-15 14:48:40
PST ---
I'm seeing the same issue on my new laptop (HP 1510p running Debian Lenny).
Initially DPI was getting set to (96, 96), which is too low for my laptop's
LCD
screen. Apparently because the laptop's display does not provide size info.

http://bugs.freedesktop.org/show_bug.cgi?id=16033





--- Comment #2 from Pekka Paalanen <pq at iki.fi>  2009-09-23 05:12:14 PST
---
Does this problem still occur with the latest released xorg-server?

If it does, maybe this bug should be re-targeted to xorg-server?


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Elvis Pranskevichus <elprans at gmail.com> changed:

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                 CC|                            |elprans at gmail.com




--- Comment #3 from Elvis Pranskevichus <elprans at gmail.com>  2010-01-11
11:16:08 PST ---
I can confirm this happening on xorg-server-1.7.4 on my system.  I use external
monitor in a randr setup and the physical dimensions reported in xdpyinfo are
totally wrong:

dimensions: 4000x1600 pixels (331x207 millimeters)
resolution: 307x196 dots per inch

I have DisplaySize set for both monitors and apparently the server takes only
the first one.

Now, I've hit this trying to remedy a regression from xorg-server-1.6. 
Previously, physical dimensions were detected correctly and a correct DPI was
set.  Now (with 1.7.4) it just uses 96x96.  xrandr reports correct dimensions
in all cases.

Oh, and I'm on xf86-video-intel, so this is almost definitely not
nouveau-specific.


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Marcin Slusarz <marcin.slusarz at gmail.com> changed:

           What    |Removed                     |Added
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          Component|Driver/nouveau              |Server/general
         AssignedTo|nouveau at lists.freedesktop.o |xorg-team at lists.x.org
                   |rg                          |

--- Comment #4 from Marcin Slusarz <marcin.slusarz at gmail.com>
2010-07-23 16:37:32 PDT ---
probably not nouveau bug, changing component to Server/general

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