[Bug 26865] New: [R600] LCD panel black (backlight on) with VGA screen plugged

[bugzilla-daemon at freedesktop.org]

http://bugs.freedesktop.org/show_bug.cgi?id=26865

           Summary: [R600] LCD panel black (backlight on) with VGA screen
                    plugged
           Product: xorg
           Version: 7.5
          Platform: Other
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/Radeon
        AssignedTo: xorg-driver-ati at lists.x.org
        ReportedBy: babataz at gmail.com
         QAContact: xorg-team at lists.x.org


Created an attachment (id=33727)
 --> (http://bugs.freedesktop.org/attachment.cgi?id=33727)
Xorg.conf

OS: Debian/testing
linux-image-2.6.32-trunk-686 = 2.6.32-5
firmware-linux-nonfree = 0.22
xserver-xorg-video-radeon = 1:6.12.4-2
xserver-xorg = 1:7.5+3
xserver-xorg-core = 2:1.7.5-1
x11-xserver-utils = 7.5+1+b1

Chipset: ATI Radeon Xpress 1250 (RS600M or RS690M ?)
Laptop: Samsung R20


I can't have dual head setup (LVDS/VGA-0),
LCD panel becomes black (with backlight on, xrandr thinks it is on and normal)
at any xrandr operation I tried.


== Test Cases ==

1- boot without VGA plugged

xrandr works properly, no black screen.

2- boot with VGA plugged

VGA works correctly, LCD panel is black.
xrandr works.

3- boot without VGA plugged, VGA is plugged after initialization is complete

LCD panel works, VGA is not used.
Typing "xrandr" make the LCD panel become black,
nothing happens on VGA.


for case 3, I investigated a little on xrandr,
the blanking happens on XRRGetScreenRessources(dpy, root) in xrandr.c:1086.
gdb traces following for xrandr context when XRRGetScreenRessources is called.


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