Re: [gentoo-user] Madly flickering display

[J. Roeleveld]

On Friday, September 23, 2016 09:13:00 AM Peter Humphrey wrote:
> I've broken this out from the thread it appeared in, Problems with Xinerama
> after upgrade to Plasma (KDE5):
>
> On Friday 16 Sep 2016 11:18:18 I wrote:
>
> --->8
>
> > I upgraded yesterday from 5.7.4 to 5.7.5. I hoped the problem I have had
> > been fixed, but no. If I switch desktops too many times, or too often or
> > something, the desktop becomes unusable until I reboot (I haven't tried
> > just restarting xdm). It flickers rapidly, bits of one desktop are shown
> > in the middle of another or on a blank background, and it's hard to see
> > just which is the currently active desktop.
> >
> > This may be a bad interaction with the xorg-driver for my AMD GPU, which
> > has only been on the market for about a year. Though
> > sys-firmware/amdgpu-ucode hasn't changed since June.
>
> I found from Xorg.0.log that X11 wasn't finding an evdev module, even though
> I had INPUT_DEVICES="evdev" in make.conf. So I added USE=evdev to dev-
> qt/qtgui* and that created the module, even though kensington@gentoo said
> it had nothing to do with it.

I have the following:
$ grep INPUT /etc/portage/make.conf                                                                                                                                                                    
INPUT_DEVICES="evdev keyboard mouse joystick"

My qtgui doesn't have this USE-flag set.

According to my X-logs ( /var/log/Xorg.0.log ) it does find the evdev-module.

> I still get the rapid flickering and general confusion though, which is
> cured by logging out and in again.

I just tested on my desktop by madly switching desktops for 2 minutes using 
the keyboard bindings (CTRL + F1..4) and didn't see this happening.

> * That was the only relevant package to have such a USE flag, according to
> "equery h -p evdev".

Same on my system.
(Not counting games-emulation/dolphin :) )

--
Joost