Bug#898808: linux-image-4.16.0-0.bpo.1-amd64: Wrong 40Hz screen refresh rate at 1366x768, introduced after kernek 4.13

Package: src:linux Version: 4.16.5-1~bpo9+1 Severity: important Dear Maintainer, * What led up to the situation? Too low screen refresh rate lead to not smooth movement in HD videos at 60 fps Then glxgears shows that refresh rate is 40 Hz instead of 60 Hz There is no way to get 60 Hz back

Bug#898030: linux-image-4.15.0-0.bpo.2-amd64: 1366x768 at 40 Hz despite reporting 60 Hz

Package: src:linux Version: 4.15.11-1~bpo9+1 Severity: important Dear Maintainer, * What led up to the situation? Movement in HD videos appeared not smooth any more after a kernel update from 4.13 to 4.15. Then I checked with glgears and xrandr. Video vertical refresh rate is stuck at 40 Hz