[Bug 97914] Redraw lag on Ivy Bridge since 1f6dfc9df678

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=97914

--- Comment #36 from Jean Delvare <jdelvare at suse.de> ---
For reference, I am seeing this bug on SLED 12 SP2, on an Ivy Bridge CPU,
running:

kernel-default-4.4.49-92.11.1.x86_64
kernel-firmware-20160516git-19.4.noarch
xorg-x11-server-7.6_1.18.3-64.1.x86_64
Mesa-11.2.1-103.9.x86_64

My laptop is running Gnome 3.20, no compton here. Xorg.0.log says I use DRI2.

I have to admit I'm a bit puzzled. This bug only seems to happen on Ivy Bridge
processors, using the updated intel ddx driver. It was reported on different
kernel versions, using different desktop environments, and different Mesa
versions. However you blame Mesa for it, even though it was working just fine
before the intel driver optimization.

Can you explain why other hardware is not affected by the problem? The same
optimizations were applied to the ati and amdgpu ddx drivers, shouldn't they
hit the same problem in Mesa?

I looked at the Mesa git repository and I can't see any reference to this bug.
It does not look like Chris' patches were ever applied there.

It's been almost 8 months since the regression was introduced, what's the plan?

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