[SOLVED] Kernel 4.0 with Radeon HD problem: Purple Line

Question

Hi All,
This is my first post on the Arch forums! and probably going to get flamed a bit too as this is not an Arch specific problem. I am just hoping you guys will be able to help point me in to the right direction. The reason I am posting here on the Arch forums as it does affect Arch Linux now the kernel package has ticked over to 4.0.
The problem, is that after updating to Kernel 4.0, there is now a vertical purple line on the left hand side of my screen as soon as X is started - when using HDMI. I believe the problem lies in the Kernel, how would I go about reporting a potential kernel bug and what kind of logs (and how) would they expect me to provide?
My hardware (Radeon HD 6570):
01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Turks PRO [Radeon HD 6570/7570/8550]
It works perfectly on 3.19 but 4.0 and 4.1-rc the purple line is present. In addition to the purple line, the display is not quite as crisp - slightly blurry.
I am using open source drivers - I have tried Mesa 10.5 and 10.6 (development) makes no difference.
Have tried on both Arch Linux and Linux Mint - again distro makes no difference.
Only happens when using HDMI out, VGA is fine.
Image: https://lh3.googleusercontent.com/-i_dX … 203014.jpg
Any help would be greatly appreciated
RESOLUTION: Bug Report @ kernel.org https://bugzilla.kernel.org/show_bug.cgi?id=97561
WORKAROUND:
xrandr --output HDMI-0 --auto --set audio off
PS. I learnt a lot moving to Arch... great distro!!
Last edited by rlees85 (2015-04-30 21:11:10)

Answer 1

I'm also having video issues since updating to kernel 4.0.1.  A lot of video tearing and "glitching".  I have a Radeon card as well:
$ lspci | grep Radeon
05:00.0 Display controller: Advanced Micro Devices, Inc. [AMD/ATI] Venus XTX [Radeon HD 8890M / R9 M275X] (rev ff)
I'm going to try and downgrade my kernel to confirm if that's the cause.  There weren't many other packages that upgraded, though...
**EDIT**  The kernel is definitely the issue, or at least something conflicting with the kernel.  I'm having bad luck.  This is the second package upgrade in a week to make my system screwy (wpa_supplicant being the first). 
Unfortunately, I'm not real sure myself on how to go about filing an effective bug report.  Once more info on that is forthcoming, I'll re-upgrade my kernel and provide any relevant logs, etc.  Or file a separate report if the issues aren't closely related.  Thanks!
Last edited by Forgotten Path (2015-04-29 20:48:07)