Re: xsrc/49495

[Taylor R Campbell <riastradh%NetBSD.org@localhost>]

The following reply was made to PR kern/49495; it has been noted by GNATS.

From: Taylor R Campbell <riastradh%NetBSD.org@localhost>
To: Patrick Welche <prlw1%cam.ac.uk@localhost>
Cc: gnats-bugs%NetBSD.org@localhost
Subject: Re: xsrc/49495
Date: Mon, 1 Jun 2015 17:16:40 +0000

    Date: Mon, 1 Jun 2015 16:28:53 +0100
    From: Patrick Welche <prlw1%cam.ac.uk@localhost>
 
    I reproduced the no X with serial console problem on a Dell OptiPlex GX6=
 20
    without extra radeon card, i.e., with a
 
      i915drmkms0 at pci0 dev 2 function 0: Intel 82945G/P Integrated Graphi=
 cs Device (rev. 0x02)
 
 Great, thanks!
 
    >From ttyE0, without serial console, without X running:
 
    # ./writefb /dev/ttyE0 0xff350053
    writefb: width    1024
    writefb: height   768
    writefb: depth    32
    writefb: cmsize   256
    writefb: mod    0
 
    and the background went purple (!)
 
 This is intentional.  Intentional purple is the best kind.
 
 
 ...I think I see the problem: when console is serial, genfb steals the
 display registers for some reason.  If you disable genfb at pci, does
 it work?
 
 (I'm not yet sure why this is happening: I don't think I ever needed
 to disable genfb at pci.  But I haven't had a setup like this to test
 in a while.)