Comment # 27 on bug 109628 from Mirek Kratochvil

Confirming the posted X driver workaround fixes it on 2700U. Debian 5.2.*
kernels and vanilla 5.3.1 work perfectly now.

Anyway, the latest X driver from git is broken as well. Should the issue be
reported there, or is it better to fix it in kernel layer?

Thanks again,
-mk