Brainiarc7/clevo-dm-series-ubuntu-driver-setup.md Secret

## clevo-dm-series-ubuntu-driver-setup.md

      
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              clevo-dm-series-ubuntu-driver-setup.md
            
          
    References:

http://bazaar.launchpad.net/%7Esystem76-dev/system76-driver/trunk/view/head:/system76driver/tests/test_model.py
http://bazaar.launchpad.net/%7Esystem76-dev/system76-driver/trunk/view/head:/system76driver/products.py
http://bazaar.launchpad.net/%7Esystem76-dev/system76-driver/trunk/view/head:/system76driver/actions.py

Notes:
We will use the work above as a reference on which the work below is based upon:
For the P751DM2-G model, we can see that the matching model here is the serw10 identifier, whose workarounds are shown below:
system76-driver/products.py
'serw10': {
    'name': 'Serval WS',
    'drivers': [
        actions.backlight_vendor,
        actions.dac_fixup,
        actions.pulseaudio_hp_spdif_desc,
        actions.hidpi_scaling,
    ],
},

Armed with that knowledge, we can now infer as to what each mapped action does and what changes need to be made.
So, for the actions.backlight_vendor, all it needs is an appending of the option acpi_backlight=vendor to the kernel option line in /etc/default/grub and we're done. Regenerate the grub configuration by running:
sudo update-grub

And you're good to go.
The second action, dac_fixup, is a two-step process, inferred from the actions.py subroutine:
(a). Create a /lib/firmware/system76-audio-patch with the following entry:
[codec]
0x{vendor_id:08x} 0x{subsystem_id:08x} 0

[pincfg]
0x1b 0x01111060

[verb]
0x1b 0x707 0x0004

(b). Create an /etc/modprobe.d/system76-alsa-base.conf file with the following entries:
 options snd-hda-intel patch=system76-audio-patch

Then reboot the system. Confirm the successful override by grepping dmesg on boot:
 dmesg | grep system76

The next workaround is the pulseaudio_hp_spdif_desc , which applies the following workarounds:
(a). Create the file usr/share/pulseaudio/alsa-mixer/paths/iec958-stereo-output.conf and populate it with:
# This file is part of PulseAudio.
#
# PulseAudio is free software; you can redistribute it and/or modify
# it under the terms of the GNU Lesser General Public License as
# published by the Free Software Foundation; either version 2.1 of the
# License, or (at your option) any later version.
#
# PulseAudio is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with PulseAudio; if not, see <http://www.gnu.org/licenses/>.


[General]
description = Headphones + Digital Output (S/PDIF)

[Element IEC958]
switch = mute

When done, issue a reboot.
Optional: System76's quirk for the Nvidia driver:
Populate the file /usr/share/nvidia-common/quirks/system76-nvidia-quirks-serw10 with the content below:
Section "Quirk"
    Identifier "system76-0-serw10"
    Handler "nvidia-375"
    Match "sys_vendor" "System76, Inc.|System76"
    Match "product_version" "serw10"
    XorgSnippet
        Section "Device"
            Identifier "System76 nVidia Card"
            Driver "nvidia"
            Option "NoLogo" "True"
            Option "FlatPanelProperties" "DFP-1: Dithering = Enabled"
        EndSection
    EndXorgSnippet
EndSection

The quirk is optional, as the default Nvidia installer does it's job fairly well.
Extra troubleshooting hints:
You can view sound card pin configurations by running:
sudo cat /sys/devices/pci0000:00/0000:00:1f.3/sound/card0/hwC0D0/init_pin_configs

In my case, this is the output, useful when you need to confirm the pin configuration before applying firmware patches as shown above:
0x11 0x4004d000
0x12 0x90a60140
0x14 0x90170110
0x15 0x411111f0
0x16 0x411111f0
0x17 0x01011050
0x18 0x01a11030
0x19 0x411111f0
0x1a 0x0181103f
0x1b 0x411111f0
0x1c 0x411111f0
0x1d 0x40350d29
0x1e 0x01441120
0x1f 0x411111f0