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Bug#899240: debian-installer: blank screen on boot (6th Gen. ThinkPad X1)

On Mon, 21 May 2018 15:47:20 +0300 =?UTF-8?B?TWF0dGkgUMO2bGzDpA==?= <mpo@iki.fi> wrote:
> Package: debian-installer
> Severity: normal
> Tags: d-i
> Dear Maintainer,
> booting to Debian Installer fails on a 6th Generation Lenovo ThinkPad
> X1 (type 20KH-006MMX) with the following symptoms:
> * Boot from a Debian installation media (mini.iso 2018-05-18 on a USB
>   drive). Also tested with Wheezy, Jessie, Stretch and Testing amd64
>   ISOs.
> * GRUB menu (version 2.02-2) shows options "Install", "Advanced
>   options" and "Install with speech synthesis".
> * On entering "Install", the screen goes blank. The machine is still
>   powered on and the keyboard leds respond to, e.g., the "mute"
>   button. Switching to virtual terminals does not help as the screen
>   appears dead.
> Similar problems with a blank screen have been reported on earlier
> versions of the ThinkPad X1 (see
> https://bbs.archlinux.org/viewtopic.php?id=210007) with workarounds
> involving boot parameters intel_pstate=no_hwp or
> intel_pstate=disable. In this case, this does not help. Also, the bug
> appears on several kernel versions (from 3.16 in Jessie).
> Booting to a live environment using debian-live-9.3.0-amd64-gnome.iso
> is not affected by the bug. The live system uses a full 2560x1440
> resolution on a 4.9.0-4-amd64 kernel. However, the "Install" option on
> the same ISO results in a blank screen.

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