[Bug 39882] New: Regression: Plugging in a HDMI connector makes the LCD of X120e go dark

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Sat Aug 6 06:27:10 PDT 2011


           Summary: Regression: Plugging in a HDMI connector makes the LCD
                    of X120e go dark
           Product: DRI
           Version: XOrg CVS
          Platform: x86-64 (AMD64)
        OS/Version: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Radeon
        AssignedTo: dri-devel at lists.freedesktop.org
        ReportedBy: gottfried.haider at gmail.com

When I plug in my external TFT monitor while my X120e is in use, the laptop's
internal LCD immediately goes dark - yet I don't have a picture on the TFT.

I first noticed this with kernel 3.0.0, this is fully reproducible also on
3.0.1. Since I did not remember this happening before, I tested with an older
kernel (Ubuntu's 2.6.38, but should not make a difference), and indeed: with
2.6.38 the internal LCD stays on (which is the expected behavior).

The TFT is connected via a HDMI-to-DVI cable. Userspace is Xubuntu 11.04 with
xorg-edgers PPA.

At a first glance, I do not see anything interesting in either dmesg or
Xorg.log when this happens. Note: the machine does not hang, since I can still
(blindly) launch a terminal and make the machine restart - for which I briefly
get a picture on the LCD again after XOrg shutdown.

I am attaching lspci and a dmesg/Xorg.log below - please let me know if I can
help with anything else (I can easily test kernel patches).

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