FS#52666 - [linux] 4.8.13 macbook screen flickers badly

Attached to Project: Arch Linux
Opened by Joshua Houghton (jjhoughton) - Saturday, 21 January 2017, 22:43 GMT
Last edited by Doug Newgard (Scimmia) - Sunday, 22 January 2017, 00:23 GMT
Task Type Bug Report
Category Packages: Core
Status Closed
Assigned To No-one
Architecture All
Severity High
Priority Normal
Reported Version
Due in Version Undecided
Due Date Undecided
Percent Complete 100%
Votes 0
Private No

Details

This was a problem on my 2015 macbook pro with cape_verde gpu.

The screen would flicker and the image would sort of wobble up and down on kernels later than 4.8.6. I can confirm that the upstream patch mentioned in the attached patch is in kernel 4.9.5 so this is not super high priority assuming we'll be using kernel 4.9.5 sometime soon.

I didn't write the upstream patch but i couldn't simply cherry pic it as all the radeon code has been moved to the new amdgpu driver upstream.

You can see reports of this problem on the aur
https://aur.archlinux.org/pkgbase/linux-macbook/?comments=all

I have tested this patch on aforementioned linux-macbook kernel. It looked like this is the commit that caused the regression in 4.8.7
commit e136de5d733161fdfd203f23b448434170d189ea

   0001-drm-radeon-drop-verde-dp... (1.4 KiB)
This task depends upon

Closed by  Doug Newgard (Scimmia)
Sunday, 22 January 2017, 00:23 GMT
Reason for closing:  Fixed
Additional comments about closing:  Already in 4.9.5
Comment by Joshua Houghton (jjhoughton) - Saturday, 21 January 2017, 23:18 GMT
I should probably mention that this is a not just a problem on the aur/linux-macbook kernel but also on the core/linux kernel and that despite a patched kernel being available for the macbook there's no big reason I for one couldn't use the stock core/linux kernel.

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