[Bugme-new] [Bug 4147] New: radeonfb fails with external display

bugme-daemon at osdl.org bugme-daemon at osdl.org
Wed Feb 2 02:10:21 PST 2005


http://bugme.osdl.org/show_bug.cgi?id=4147

           Summary: radeonfb fails with external display
    Kernel Version: 2.6.11-rc2
            Status: NEW
          Severity: high
             Owner: jsimmons at infradead.org
         Submitter: schiotz at fysik.dtu.dk


Distribution:  Gentoo
Hardware Environment:  IBM Thinkpad T30 model 2366 with Radeon Mobility 7500
Software Environment:
Problem Description:

I place my thinkpad in a port replicator with a digital video output to a flat
screen.  It works fine if I build the kernel without framebuffer, but if I build
with framebuffer (radeonfb) then the output goes to the internal screen instead.
 If I build radeonfb as a module, then output switches to the internal screen
when the module is loaded.

I see it in the following kernel versions:  2.6.10, 2.6.11-rc2, 2.6.11-rc2-mm2

Strangely, if I apply the "Another whitelist patch with command line option for
forcing" from bug 3022 to the 2.6.11-rc2-mm1 kernel, then the external screen
works fine - until X starts at which point I get a black screen and a locked-up
keyboard.


Steps to reproduce:

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