Bug#879095: sddm flickering on login screen (white + repaint)

[Martin Steigerwald <martin@lichtvoll.de>]

Hello.

I can confirm this behavior on an IBM ThinkPad T42 with Radeon graphics.

martin@shambhala:~> lspci -nn | grep VGA
01:00.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc. [AMD/
ATI] RV350/M10 / RV360/M11 [Mobility Radeon 9600 (PRO) / 9700] [1002:4e50]

For me it appears to be related to

Flickering ATI X1300 r300 Mesa 17.2
https://github.com/sddm/sddm/issues/898

However disabling vsync for r300 driver did not help. I tried it via .drirc in 
/root and in /var/lib/sddm like this:

<driconf>
    <device screen="0" driver="r300">
        <application name="Default">
            <option name="vblank_mode" value="0" />
        </application>
    </device>
</driconf>

I also tried "dri2" as driver name.

Thanks,
-- 
Martin