[Bug 89901] [drm:hsw_unclaimed_reg_detect.isra.12] *ERROR* Unclaimed register detected.

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=89901

--- Comment #4 from Georgios Varisteas <yorgos.v at gmail.com> ---
So I've been running without any crash or even a dmesg entry. I even played a
Steam video game.

I did a few things and don't know which did it, maybe all of them.

1) First I noticed I had xorg compiled with glamor support and the intel driver
without. Re compiled both without glamor completely. I also removed UXA support
from the intel driver.

2) In xorg.conf I added
Option      "TearFree"          "true"
and removed
Option      "DebugFlushBatches" "true"

The complete entry now is:
Section "Device"
        Identifier  "intel5500"
        Driver      "intel"
        Option      "RenderAccel"       "true"
        Option      "AccelDFS"          "true"
        Option      "Monitor-LVDS1"     "eDP1"
        Option      "AccelMethod"       "sna"
        Option      "TearFree"          "true"
EndSection



2) I also changed some seemingly related configuration in the kernel:
Processor type and features  --->
[ ] Enable MPS table    # probably set from the stock configuration
Graphics support  --->
(1)  Maximum number of GPUs   # used to be 16 by default
     Direct Rendering Manager (XFree86 4.1.0 and higher DRI support)  --->
[ ]     Allow to specify an EDID data set instead of probing for it     # also
set by default
[ ]     Enable preliminary support for prerelease Intel hardware by default   
# set by default!
     Backlight & LCD device support  --->
<*>     Generic GPIO based Backlight Driver    # previously not set, only
generic
Sound card support  --->
     Advanced Linux Sound Architecture  --->
[*]     Dynamic device file minor numbers    # was not set



3) Finally I appended the following to my kernel options:
acpi_osi=Linux acpi_backlight=vendor

NOTE: I also tried to add i915.semaphores=1 to the kernel which every time
resulted in a quick system freeze right after submitting credentials to KDM and
before even fully loading any KDE modules.

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