[Bug 104195] New: [i915] [Device 591b] Backlight not working - wake from suspend not turning on monitor.

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=104195

            Bug ID: 104195
           Summary: [i915] [Device 591b] Backlight not working - wake from
                    suspend not turning on monitor.
           Product: xorg
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/intel
          Assignee: chris at chris-wilson.co.uk
          Reporter: michael.pihlblad at gmail.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org

Hello.

i have a Thinkpad T470-P which is equipped with Intel HD graphics 630

00:02.0 VGA compatible controller: Intel Corporation Device 591b (rev 04)

I tried upgrading graphics drivers with intel graphics update tool 2.06:
https://01.org/linuxgraphics/downloads/intel-graphics-update-tool-linux-os-v2.0.6

But it caused waking up from suspend to not work, seems the screen is not
enabled, 

Also the adjusting of the backlight stops working. 

/sys/class/backlight is empty. Default there was a link to intel_backlight,
after playing with kernel option parameter backlight= set to "vendor" i get a
link to lenovo_backlight, but it does not work.



Backround info:

I have installed Kubuntu 17.04, It works almost fine out of the box.

The size of everything on the screen was very small so i scaled it to 1.1 in
KDE settings. Increased fonts sizes and forced DPI to 120.

I have a big issue with text getting corrupt, complete rows get messed up, 
most problem in Qtcreator but also noticed it in Konsole.

kernel module loaded for the graphics card is i915.

Xorg is default using fbdevhw when booting stock kernel and with kernel
4.14.4-041404.
 it is using modesetting driver with submodule fb.

I tried changing font, changing font settings like anti aliasing, sub pixel
rendering e.t.c. without any luck.

I tried upgrading the kernel to 4.14.4-041404, upgrading the bios. 

So what needs to be done?

What is the correct setup? i.e:
    -which kernel module and version to use for intel HD graphics 630?
    - Any special kernel option parameter to set during boot?
    - which Xorg driver to use ?
    - Any special Xorg config options?
    - Any special KDE settings for fonts e.t.c. ?


Thank you.

// Michael

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