[Bug 1754536] [NEW] Kubuntu bionic beta 1: laptop screen set to minimum brightness

[Glen Ditchfield]

Public bug reported:

I booted from a USB drive made from the Bionic Beta 1 Kubuntu Desktop AMD64 ISO.  I have powered off before booting, and also restarted from Kubuntu 17.10. Either way,
- the screen starts at normal brightness (about 50%).
- The "keyboard" screen appears, again at normal brightness.
- A couple of console messages appear, and screen brightness drops to the minimum value.
- The Kubuntu "K" splash screen and the Welcome "Try Kubuntu"/"Install Kubuntu" chooser appear, at minimum brightness.
- I choose "Try Kubuntu" and the live desktop appears, at minimum brightness.
- Strangely, the Kubuntu Desktop's "Battery and Brightness" says that the screen is at 100% brightness.  As soon as I move the brightness slider, the screen brightens up to match it.

The laptop is an HP EliteBook 8440p, with Intel graphics.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: syslinux (not installed)
ProcVersionSignature: Ubuntu 4.15.0-10.11-generic 4.15.3
Uname: Linux 4.15.0-10-generic x86_64
ApportVersion: 2.20.8-0ubuntu10
Architecture: amd64
CasperVersion: 1.389
CurrentDesktop: KDE
Date: Fri Mar  9 01:13:57 2018
LiveMediaBuild: Kubuntu 18.04 LTS "Bionic Beaver" - Alpha amd64 (20180306.1)
ProcEnviron:
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: syslinux
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: syslinux (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug bionic

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https://bugs.launchpad.net/bugs/1754536

Title:
  Kubuntu bionic beta 1: laptop screen set to minimum brightness

Status in syslinux package in Ubuntu:
  New

Bug description:
  I booted from a USB drive made from the Bionic Beta 1 Kubuntu Desktop AMD64 ISO.  I have powered off before booting, and also restarted from Kubuntu 17.10. Either way,
  - the screen starts at normal brightness (about 50%).
  - The "keyboard" screen appears, again at normal brightness.
  - A couple of console messages appear, and screen brightness drops to the minimum value.
  - The Kubuntu "K" splash screen and the Welcome "Try Kubuntu"/"Install Kubuntu" chooser appear, at minimum brightness.
  - I choose "Try Kubuntu" and the live desktop appears, at minimum brightness.
  - Strangely, the Kubuntu Desktop's "Battery and Brightness" says that the screen is at 100% brightness.  As soon as I move the brightness slider, the screen brightens up to match it.

  The laptop is an HP EliteBook 8440p, with Intel graphics.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: syslinux (not installed)
  ProcVersionSignature: Ubuntu 4.15.0-10.11-generic 4.15.3
  Uname: Linux 4.15.0-10-generic x86_64
  ApportVersion: 2.20.8-0ubuntu10
  Architecture: amd64
  CasperVersion: 1.389
  CurrentDesktop: KDE
  Date: Fri Mar  9 01:13:57 2018
  LiveMediaBuild: Kubuntu 18.04 LTS "Bionic Beaver" - Alpha amd64 (20180306.1)
  ProcEnviron:
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: syslinux
  UpgradeStatus: No upgrade log present (probably fresh install)

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