Re: kern/56648: i915drmkms fails to detect output

[Emmanuel Dreyfus <manu%netbsd.org@localhost>]

The following reply was made to PR kern/56648; it has been noted by GNATS.

From: Emmanuel Dreyfus <manu%netbsd.org@localhost>
To: gnats-bugs%netbsd.org@localhost
Cc: 
Subject: Re: kern/56648: i915drmkms fails to detect output
Date: Sat, 22 Jan 2022 02:19:38 +0000

 On Fri, Jan 21, 2022 at 01:33:50PM +0000, Emmanuel Dreyfus wrote:
 > On Fri, Jan 21, 2022 at 10:20:01AM +0000, Martin Husemann wrote:
 > >  Duplicate of kern/56608 ?
 > 
 > Note quite: in my case it finds the display connected to eDP1.
 
 I made some progress!
 
 The external HDMI1 actually works, it is just unable to probe the 
 output for a connected screen. Configuring the mode manually using cvt
 and xrandr produces a working HDMI1 output for X11. 
 
 Mode data obtained using cvt 1920 1080
 
 xrandr --output HDMI1 --newmode "1920x1080_60.00"  \
         173.00  1920 2048 2248 2576  1080 1083 1088 1120 -hsync +vsync
 xrandr --output HDMI1 --addmode HDMI1 "1920x1080_60.00" 
 xrandr --output HDMI1 --mode "1920x1080_60.00" 
 
 This produces a mirrored output. xrandr --output HDMI1 --left-of eDP1
 caused a panic:
 panic: kernel diagnostic assertion "!(vma->ggtt_view.type)" failed: file "/home2/manu/netbsd-src/sys/external/bsd/drm2/dist/drm/i915/gt/intel_ggtt.c", line 1769
 
 -- 
 Emmanuel Dreyfus
 manu%netbsd.org@localhost