[Kernel-packages] [Bug 1870971] Re: [amdgpu] (X)ubuntu 20.04 boots to black screen on Lenovo Ideapad L340-17API when in battery mode

I have experienced the problem with the black screen in battery mode in all my (fairly new) AMD notebooks (bought this year; all AMD Ryzen 5 3500U), running Kubuntu 20.04. As of today the status is as follows: - Lenovo Ideapad L340-17API (81LY000KGE) (possibly identical to the one in #21). Kernel

[Kernel-packages] [Bug 1870971] Re: [amdgpu] (X)ubuntu 20.04 boots to black screen on Lenovo Ideapad L340-17API when in battery mode

... further to # 30: it would have been nice, but actually the Lenovo Ideapad L340-17API (81LY000KGE) still occasionally gets a "black screen". Weird: after numerous positive attempts (something like 10), the odd boot goes to black screen. Then a "series" of black screens seems to start. -- You r

[Kernel-packages] [Bug 1870971] Re: [amdgpu] (X)ubuntu 20.04 boots to black screen on Lenovo Ideapad L340-17API when in battery mode

I had difficulties installing Kernel 5.8-rc3. But I tested 5.8.1: https://kernel.ubuntu.com/~kernel-ppa/mainline/v5.8.1/ Lenovo Ideapad L340-17API (81LY000KGE): No black screen in 6 attempts. The notebook also booted much faster. Before, there had always been a kind of "pause", during which it ma