Re: xsrc/49495

[Patrick Welche <prlw1%cam.ac.uk@localhost>]

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

From: Patrick Welche <prlw1%cam.ac.uk@localhost>
To: Taylor R Campbell <riastradh%NetBSD.org@localhost>
Cc: gnats-bugs%NetBSD.org@localhost
Subject: Re: xsrc/49495
Date: Mon, 1 Jun 2015 16:28:53 +0100

 On Thu, May 14, 2015 at 12:23:19AM +0000, Taylor R Campbell wrote:
 > [resent to gnats-bugs, hoping that's the right address for PR followup]
 > 
 > Can you please try running the attached program and seeing whether
 > anything shows up on your display?
 > 
 > make writefb
 > ./writefb /dev/ttyE0 0xff350053
 > 
 > (Run as root; this will permanently set ttyE0 into dumbfb mode, unless
 > you write another program that puts it back into text mode.)
 > 
 > This will determine whether the problem is just with the kernel
 > driver, or whether X is actually involved too.
 
 I reproduced the no X with serial console problem on a Dell OptiPlex GX620
 without extra radeon card, i.e., with a
 
   i915drmkms0 at pci0 dev 2 function 0: Intel 82945G/P Integrated Graphics Device (rev. 0x02)
 
 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 the same as the output of xdpyinfo on this particular setup.
 
 (With serial console, I can't get to ttyE0 - all is black (Out of Range
 on this monitor), if I ssh in, I get the same result)