On 17.07.2019 3:52, ho...@rumormillnews.com wrote:
>> On 14.07.2019 12:02, ho...@rumormillnews.com wrote:
>>>> On 14.07.2019 4:20, Felix Miata wrote:
>>>>> ho...@rumormillnews.com composed on 2019-07-13 18:07 (UTC-0400):
>>>>>
>>>>>> Thanks for the tip.  Looks like a lot of information here but I don't
>>>>>> really understand it.  Xorg seems to have unloaded the radeon
>>>>>> driver...?
>>>>>> Graphics:  Device-1: AMD Kaveri [Radeon R7 Graphics] vendor: ASUSTeK
>>>>>> driver: N/A
>>>>>>            bus ID: 00:01.0 chip ID: 1002:130f
>>>>>>            Display: x11 server: X.Org 1.20.4 driver: ati,vesa
>>>>>>            unloaded: fbdev,modesetting,radeon resolution:
>>>>>> 1600x900~N/A
>>>>>>            OpenGL: renderer: llvmpipe (LLVM 7.0 128 bits) v: 3.3 Mesa
>>>>>> 18.3.6
>>>>>>            compat-v: 3.1 direct render: Yes
>>>>>> Where would I find "AMDGPU" and how would I get Xorg to use it?
>>>>> These should cover it:
>>>>> apt purge xserver-xorg-video-ati xserver-xorg-video-radeon
>>>>> apt install xserver-xorg-video-amdgpu firmware-amd-graphics
>>>> To install "firmware-amd-graphics" package is a good suggestion.
>>>> But chances are high that removal of *-ati and *-radeon packages will
>>>> also remove Desktop Environment, because those packages are part of
>>>> "xserver-xorg-video-all" package.
>>>> I'd suggest a less radical approach and simply "tell" the system what
>>>> driver to use via modprobe config files. [1]
>>> Thanks. :)  I find old files in /etc/modprobe.d:
>>>
>>> -rw-r--r-- 1 root root  154 Nov 29  2016 amd64-microcode-blacklist.conf
>>> -rw-r--r-- 1 root root   23 Apr 28  2011 i915-kms.conf
>>> -rw-r--r-- 1 root root  154 May 15  2017 intel-microcode-blacklist.conf
>>> -rw-r--r-- 1 root root   51 May 10  2014 modesetting.conf
>>> -rw-r--r-- 1 root root  292 Aug  3  2012 nvidia-kernel-common.conf
>>> -rw-r--r-- 1 root root  119 Nov 12  2013 oss-compat.conf
>>> -rw-r--r-- 1 root root   27 Jan 19  2014 radeon-kms.conf
>>>
>>> ...I find radeon-kms.conf contains: "options radeon modeset=-1".  Is
>>> that
>>> likely where my problem, or part of my problem, is coming from?
>>>
>>>
>> Kernel mode setting (modeset) is often required to be enabled with
>> recent kernels. "-1" usually means "auto".
>> "radeon-kms.conf" is not part of any package in stretch, so I assume it
>> was manually created or a leftovers of some sort from previous system
>> upgrades.
>>
>> The safest approach to test if switching to "amdgpu" driver will help,
>> would be adding kernel module parameters at boot time.
>> Press "e" to edit grub menu entry and add parameters to "linux" line
>> after "quiet" parameter:
>>
>> amdgpu.si_support=1 amdgpu.cik_support=1 radeon.si_support=0
>> radeon.si_support=0
>>
>> and continue to boot your system by pressing F10.
> I did the edit you suggested - changing the *.si to *.cik on that second
> readeon reference - but can't tell if anything was affected by it. 
> Psychedelic colors still return on leaving the desktop and coming back to
> it, and output of inxi -Gxxxz also appears the same:
>
> Graphics:
>   Device-1: AMD Kaveri [Radeon R7 Graphics] vendor: ASUSTeK
>   driver: N/A bus ID: 00:01.0 chip ID: 1002:130f
>   Display: x11 server: X.Org 1.20.4 driver: ati,vesa
>   unloaded: fbdev,modesetting,radeon resolution: 1600x900~N/A
>   OpenGL: renderer: llvmpipe (LLVM 7.0 128 bits)
>   v: 3.3 Mesa 18.3.6 compat-v: 3.1 direct render: Yes
>
> Also, I've moved all files from /etc/modprobe.d to a backup directory;
> their absence does not appear to have made any difference, either.
>
> --hobie
>
Is it possible that you mistyped some of those parameters?
You can disable "radeon" kernel module from loading completely by
blacklisting it and see if that helps.

Create "amdgpu-kms.conf" file in "/etc/modprobe.d/" with contents as
described in previous email.
Also create a new "radeon-blacklist.conf" file in "/etc/modprobe.d/"
containing:
blacklist radeon

After that, update initramfs with changes you made and reboot:
    $ sudo update-initramfs -u


-- 
With kindest regards, Alexander.

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