[DragonFlyBSD - Bug #2923] (Resolved) kernel module i915 leads to frozen screen on 15" macbookpro6,2

[bugtracker-admin at leaf.dragonflybsd.org]

Issue #2923 has been updated by peeter.

Status changed from New to Resolved

Resolved by vga_switcheroo

http://gitweb.dragonflybsd.org/dragonfly.git/commit/a7d4637632ad5e829ba2f255d0edae845b680983


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Bug #2923: kernel module i915 leads to frozen screen on 15" macbookpro6,2 
http://bugs.dragonflybsd.org/issues/2923#change-13154

* Author: peeter
* Status: Resolved
* Priority: Normal
* Assignee: 
* Category: 
* Target version: 
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uname:

DragonFly 4.5.0.1285.gb3a17-DEVELOPMENT x86_64


There are two video cards:

---
1. Intel HD graphics: GPU: built-in

Vendor: Intel (0x8086)
Device ID: 0x0046
Revision ID: 0x0018
Bus: builtin
Color LCD: 
Display type: LCD
Resolution: 1680x1050
Pixel depth: 32-bit color (ARGB8888)

2. NVIDIA GeForce GT 330M: GPU: PCIe

Bus: PCIe
Revision: 
Vendor: 
VRAM: 256 MB
---

# pciconf -lv | grep vga

vgapci1 at pci0:0:2:0:  class=0x030000 card=0x00000000 chip=0x00468086 rev=0x18 hdr=0x00
vgapci0 at pci0:1:0:0:  class=0x030000 card=0x00c7106b chip=0x0a2910de rev=0xa2 hdr=0x00

--- 

# kldload i915

gives output about loading:

. . .
[drm] Initialized drm 1.1.0 20060810
[drm] pdev:   vendor=0x8086  device=0x0046 rev=0x1
[drm]           svendor=0x0000 sdevice=0x0000 irq=16
[drm] Memory usable by graphics device = 2048M
[drm] Supports vblank timestamp caching Rev 2 (21.10.2013)
[drm] Driver supports precise vblank timestamp query.
[drm] failed to find VBIOS tables
tunable drm.video.VGA-1 is not set
. . .
drm1: taking over the fictitious range 0xb0000000-0xc0000000
<6>[drm] GMBUS [gmbus bus panel] timed out, falling back to bit banging on pin 2

<3>EDID block is all zeroes
drm1: warning: VGA-1: EDID block 0 invalid.
kernel: [drm] GMBUS [gmbus bus panel] timed out, falling back to banging on pin 2
kernel: EDID block is all zeroes
drm1: info: No connectors reported connected with modes
<6>[drm] Cannot find any crtc or sizes - going 1024x768
---

After this the system becomes stuck: the keyboard seems to work (ie capslock light responds), but the screen is frozen and cannot get to another vty or type anything anymore. Might be able to ssh to the machine.





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