Bug 548512

Summary:	>=sys-kernel/gentoo-sources-4.0.0 break radeon HDMI output and fullscreen operation
Product:	Gentoo Linux	Reporter:	faminebadger
Component:	[OLD] Core system	Assignee:	Gentoo Kernel Bug Wranglers and Kernel Maintainers <kernel>
Status:	RESOLVED NEEDINFO
Severity:	major	CC:	nikoli
Priority:	Normal
Version:	unspecified
Hardware:	AMD64
OS:	Linux
Whiteboard:
Package list:		Runtime testing required:	---

Description faminebadger 2015-05-03 17:48:35 UTC

I have two monitors plugged into DisplayPort connectors on my Radeon HD7970, and a further HDMI connection to my amp and TV.

As of upgrading to kernel 4.0.0, the third display briefly (for ~1s or so) shows a desktop backdrop when the system is first booted, then reverts to just showing white snow.

All full-screen hardware decoding (via vdpau / vaa) operations are broken, resulting in "radeon: The kernel rejected CS" type messages on the terminal.

Inspection of dmesg shows messages like:
  May  3 19:26:40 gentoo kernel: [drm:radeon_uvd_cs_parse [radeon]] *ERROR* Failed mapping the UVD message (-22)!
  May  3 19:26:40 gentoo kernel: [drm:radeon_cs_ioctl [radeon]] *ERROR* Invalid command stream !

These effects are 100% reproducible on my system.

Rolling back to an older kernel fixes the problem (3.18.9 works fine, I haven't binary chopped all versions in between yet).


Reproducible: Always

Steps to Reproduce:
1. Boot to X with TV (3rd display) powered on & connected to HDMI
2. 
3.
Actual Results:  
White noise / snow only shown on 3rd display.

Expected Results:  
Extended desktop on 3rd display.

Comment 1 Alice Ferrazzi Gentoo Infrastructure

2017-02-04 07:27:21 UTC

is this still a problem with more recent kernel ? 

Please open a new bug if the problem persist with a more recent kernel