[Intel-gfx] [i915 BUG] Hard freeze on i5-5xxxU with kernel 4.9+

[Lukas Erlacher]

Hello,

I don't know if this is a known bug, but it affects all kernels from 4.9
upwards (tested also with 4.11-rc1) and probably also 4.8 (there was one
report of someone using a 4.8 kernel).

The bug does not occur on 4.4.

It has been observed to affect Intel Core i5-5257U, i5-5200U and
i5-5300U CPUs, mainly on Dell Latitude E5450 Laptops.

Since it leads to a complete system freeze, I have not been able to get
any debug information out. If anyone has any advice how to get dmesg /
kernel panic information out, I'd be very happy to try.

I have tried setting i915.enable_psr=0 on the kernel bootline. That did
not help.

You can find some more information here:
https://bbs.archlinux.org/viewtopic.php?id=221252

Best,
Luke