[Bug 17215] New: Screen resolution issues with Radeon Mobility 7500 unless NoDDC specified

[bugzilla-daemon at freedesktop.org]

http://bugs.freedesktop.org/show_bug.cgi?id=17215

           Summary: Screen resolution issues with Radeon Mobility 7500
                    unless NoDDC specified
           Product: xorg
           Version: 7.3
          Platform: Other
        OS/Version: Linux (All)
            Status: NEW
          Severity: normal
          Priority: high
         Component: Driver/Radeon
        AssignedTo: xorg-driver-ati at lists.x.org
        ReportedBy: bryce at bryceharrington.org
         QAContact: xorg-team at lists.x.org


Several Ubuntu users are reporting this issue:

https://bugs.edge.launchpad.net/ubuntu/+source/xserver-xorg-video-ati/+bug/160871

With an ATI 7500, the lcd screen shows 1400x1050, but xrandr offers no other
resolutions, although several are supported.

http://launchpadlibrarian.net/12221450/xorg.conf
http://launchpadlibrarian.net/12221452/Xorg.0.log



(II) RADEON(0): Printing DDC gathered Modelines:
(II) RADEON(0): Modeline "1400x1050"x0.0 108.00 1400 1448 1560 1688 1050 1051
1054 1068 -hsync -vsync (64.0 kHz)
(II) RADEON(0): DDC Type: 4, Detected Monitor Type: 2
(II) RADEON(0): EDID data from the display on connector: Proprietary/LVDS
----------------------
(II) RADEON(0): Manufacturer: HTC Model: 17b0 Serial#: 420189172
...
(II) RADEON(0): First detailed timing not preferred mode in violation of
standard!(II) RADEON(0): redX: 0.590 redY: 0.340 greenX: 0.320 greenY: 0.560

Looks like it's using DDC instead of EDID, and DDC is only returning the one
resolution.

Adding Option "NoDDC" to xorg.conf fixes the issue.


-- 
Configure bugmail: http://bugs.freedesktop.org/userprefs.cgi?tab=email
------- You are receiving this mail because: -------
You are the assignee for the bug.