Bug 210647 - readeonkms black screen on amd fusion with APU + GPU
Summary: readeonkms black screen on amd fusion with APU + GPU
Status: New
Alias: None
Product: Base System
Classification: Unclassified
Component: kern (show other bugs)
Version: 10.3-RELEASE
Hardware: amd64 Any
: --- Affects Only Me
Assignee: freebsd-bugs (Nobody)
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2016-06-27 22:37 UTC by jean-michel
Modified: 2016-08-26 16:26 UTC (History)
2 users (show)

See Also:

Attachments
message log (28.37 KB, text/plain)
2016-06-27 22:37 UTC, jean-michel 		no flags Details
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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:

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=207999