iceamber@localhost:~ $ grep NOUVEAU /usr/src/linux/.config
CONFIG_DRM_NOUVEAU=m
CONFIG_NOUVEAU_DEBUG=5
CONFIG_NOUVEAU_DEBUG_DEFAULT=3
CONFIG_DRM_NOUVEAU_BACKLIGHT=y

iceamber@localhost:~ $ grep -E 'nvidia|VIDEO_CARDS' /etc/portage/make.conf
VIDEO_CARDS="nouveau"

here is the `grep -si nouveau /var/log/*`

I have rebuilt the xorg-server, it is built for kernel 4.12.5 now.
And I have set the USEs of "gallium" and "video_cards_nouveau"

On Sun, Aug 27, 2017 at 4:54 PM, Alexander Kapshuk <alexander.kapshuk@gmail.com> wrote:
On Sun, Aug 27, 2017 at 5:49 PM, Alexander Kapshuk
<alexander.kapshuk@gmail.com> wrote:
> On Sun, Aug 27, 2017 at 5:45 PM, Alexander Kapshuk
> <alexander.kapshuk@gmail.com> wrote:
>> On Sun, Aug 27, 2017 at 2:27 PM, IceAmber <iceamber2015@gmail.com> wrote:
>>> I have tried, but the same result
>>>
>>> On Sun, Aug 27, 2017 at 10:04 AM, Adam Carter <adamcarter3@gmail.com> wrote:
>>>>>
>>>>> yes, here is the eselect
>>>>
>>>>
>>>> When i have X problems i can resolve i run emerge -av @x11-module-rebuild
>>>> xorg-server mesa but its generally an act of desperation after running out
>>>> of intelligent options.
>>>
>>>
>>
>> Your xorg-server was built for kernel 4.9.34.
>> [    24.014] Build Operating System: Linux 4.9.34-gentoo x86_64 Gentoo
>> [    24.014] Current Operating System: Linux localhost 4.12.5-gentoo
>> #10 SMP Sat Aug 26 13:15:20 UTC 2017 x86_64
>>
>> Might be a good idea to rebuild x11-base/xorg-server for your current kernel.
>>
>> What's the output of the command lines below?
>> grep NOUVEAU linux/.config
>> grep -E 'nvidia|VIDEO_CARDS' /etc/portage/make.conf
>
> This one too please:
> grep -si nouveau /var/log/*

Also, let's make sure mesa has the USE flags below enabled:

equery -q u mesa | grep -E 'gallium|nouveau'
+gallium
+video_cards_nouveau