Bug 210647

Summary: readeonkms black screen on amd fusion with APU + GPU
Product: Base System Reporter: jean-michel <jm.dev>
Component: kernAssignee: freebsd-bugs (Nobody) <bugs>
Status: New ---    
Severity: Affects Only Me CC: grahamperrin, jpm820
Priority: ---    
Version: 10.3-RELEASE   
Hardware: amd64   
OS: Any   
Description Flags
message log none

Description jean-michel 2016-06-27 22:37:21 UTC
Created attachment 171892 [details]
message log

Asus laptop K53TA (APU + GPU)

vgapci0@pci0:0:1:0:	class=0x030000 card=0x107c1043 chip=0x96481002 rev=0x00 hdr=0x00
    vendor     = 'Advanced Micro Devices, Inc. [AMD/ATI]'
    device     = 'Sumo [Radeon HD 6480G]'
    class      = display
    subclass   = VGA

vgapci1@pci0:1:0:0:	class=0x030000 card=0x107c1043 chip=0x67411002 rev=0x00 hdr=0x00
    vendor     = 'Advanced Micro Devices, Inc. [AMD/ATI]'
    device     = 'Whistler [Radeon HD 6630M/6650M/6750M/7670M/7690M]'
    class      = display
    subclass   = VGA

kldload radeonkms result in a blackscreen.
reproducible always
Comment 1 Joe Maloney 2016-08-26 14:47:55 UTC
I can confirm this behavior when booted using BIOS mode.  VT works fine after KMS is loaded using EFI mode.  I can confirm this with nvidia-modeset, and intelkms as well.  All work fine when using EFI.  This may be related to: