https://bugs.freedesktop.org/show_bug.cgi?id=109628
--- Comment #27 from Mirek Kratochvil exa.exa@gmail.com --- 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