On 13.07.2019 13:14, ho...@rumormillnews.com wrote:
>> On 13.07.2019 12:44, ho...@rumormillnews.com wrote:
>>>> On Fri, 12 Jul 2019 20:22:55 -0400
>>>> ho...@rumormillnews.com wrote:
>>>>
>>>>>> On Fri, 12 Jul 2019 17:52:43 -0400
>>>>>> ho...@rumormillnews.com wrote:
>>>>>>
>>>>>>> Following recent 'buster' move to 'stable' I got wild psychedelic
>>>>>>> colors
>>>>>>> on my XFCE desktop, making it nearly impossible to read anything
>>>>>>> on-screen.
>>>>>>>
>>>>>>> Normally I'd have display set for 1024x768.  I've found I can get
>>>>>>> normal
>>>>>>> color on the GUI if I switch to 1600x900.  However, even then, if I
>>>>>>> switch
>>>>>>> to console (F1-F6) or if the screensaver comes on, on return the
>>>>>>> psychedelic colors are back.  If I log out / log in to the desktop,
>>>>>>> normal
>>>>>>> colors return with the 1600x900 setting only.
>>>>>>>
>>>>>>> AMD A10-7860K Radeon R7.  ASUSTEK A68HM-K motherboard.
>>>>>>> firmware-linux-free and firmware-linux-nonfree are installed.
>>>>>>>
>>>>>>> Is this a bug?  Is there a fix? I'd like to get my normal colors and
>>>>>>> normal resolution back.  Thanks in advance for any help.
>>>>>>>
>>>>>> Try a different theme. The switch from GTK-2 to GTK-3 results in a
>>>>>> mess
>>>>>> if the wrong theme is used.
>>>>>>
>>>>> Thanks. :)  Using GTK-ChTheme (which says it's for GTK+ 2, but I don't
>>>>> see
>>>>> a similar utility for GTK+ 3) I switched to Xfce 4.4 but got no
>>>>> improvement.  Should I be approaching this theme change some other
>>>>> way?
>>>>>
>>>> You have the right idea, however, perhaps try adwaita, which is a GTK-3
>>>> specific theme.
>>>>
>>> Whoa!  I tried to take screenshots so folks could see what I've been
>>> trying to describe. Shot of normal screen turns out as expected.  Shot
>>> of
>>> psychedelic screen turns out ... identical to shot of normal screen!!!
>>> In
>>> other words, what's present in graphic memory space is not the same as
>>> what's being transmitted to my display/monitor, sometimes.  Where's Rod
>>> Serling when we need him...? :)
>>>
>>>
>> What display/monitor do you use? Do you connect it using HDMI cable?
>> I remember another list user was asking same question with identical
>> symptoms sometime ago.
>>
>> --
>> With kindest regards, Alexander.
>>
> Thanks -- the brand is AOC, connected via VGA cable, there's a DVI port on
> the card but no HDMI one.  (If I plug an HDMI converter in via USB, would
> that work?)
>
This is the original thread I was talking about. [1]
See if there are any pointers that could resolve your issue.

Personally, I don't have much experience with AMD graphics (which is
sadly notorious for lacking good support on Linux), but
I would try to use different AMD drivers (use "AMDGPU" instead of
"radeon" or vice versa).
You can check what driver you currently using with this command:
    $ inxi -Gxxxz

[1] https://lists.debian.org/debian-user/2017/12/msg00203.html

-- 
With kindest regards, Alexander.

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