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envycontrol.py
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envycontrol.py
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#!/usr/bin/env python3
import argparse
import logging
import os
import re
import subprocess
import sys
from contextlib import contextmanager
# begin constants definition
VERSION = '3.5.1'
# Note: Do NOT remove this in cleanup!
CACHE_FILE_PATH = '/var/cache/envycontrol/cache.json'
BLACKLIST_PATH = '/etc/modprobe.d/blacklist-nvidia.conf'
BLACKLIST_CONTENT = '''# Automatically generated by EnvyControl
blacklist nouveau
blacklist nvidia
blacklist nvidia_drm
blacklist nvidia_uvm
blacklist nvidia_modeset
blacklist nvidia_current
blacklist nvidia_current_drm
blacklist nvidia_current_uvm
blacklist nvidia_current_modeset
blacklist i2c_nvidia_gpu
alias nouveau off
alias nvidia off
alias nvidia_drm off
alias nvidia_uvm off
alias nvidia_modeset off
alias nvidia_current off
alias nvidia_current_drm off
alias nvidia_current_uvm off
alias nvidia_current_modeset off
alias i2c_nvidia_gpu off
'''
UDEV_INTEGRATED_PATH = '/etc/udev/rules.d/50-remove-nvidia.rules'
UDEV_INTEGRATED = '''# Automatically generated by EnvyControl
# Remove NVIDIA USB xHCI Host Controller devices, if present
ACTION=="add", SUBSYSTEM=="pci", ATTR{vendor}=="0x10de", ATTR{class}=="0x0c0330", ATTR{power/control}="auto", ATTR{remove}="1"
# Remove NVIDIA USB Type-C UCSI devices, if present
ACTION=="add", SUBSYSTEM=="pci", ATTR{vendor}=="0x10de", ATTR{class}=="0x0c8000", ATTR{power/control}="auto", ATTR{remove}="1"
# Remove NVIDIA Audio devices, if present
ACTION=="add", SUBSYSTEM=="pci", ATTR{vendor}=="0x10de", ATTR{class}=="0x040300", ATTR{power/control}="auto", ATTR{remove}="1"
# Remove NVIDIA VGA/3D controller devices
ACTION=="add", SUBSYSTEM=="pci", ATTR{vendor}=="0x10de", ATTR{class}=="0x03[0-9]*", ATTR{power/control}="auto", ATTR{remove}="1"
'''
UDEV_PM_PATH = '/etc/udev/rules.d/80-nvidia-pm.rules'
UDEV_PM_CONTENT = '''# Automatically generated by EnvyControl
# Remove NVIDIA USB xHCI Host Controller devices, if present
ACTION=="add", SUBSYSTEM=="pci", ATTR{vendor}=="0x10de", ATTR{class}=="0x0c0330", ATTR{remove}="1"
# Remove NVIDIA USB Type-C UCSI devices, if present
ACTION=="add", SUBSYSTEM=="pci", ATTR{vendor}=="0x10de", ATTR{class}=="0x0c8000", ATTR{remove}="1"
# Remove NVIDIA Audio devices, if present
ACTION=="add", SUBSYSTEM=="pci", ATTR{vendor}=="0x10de", ATTR{class}=="0x040300", ATTR{remove}="1"
# Enable runtime PM for NVIDIA VGA/3D controller devices on driver bind
ACTION=="bind", SUBSYSTEM=="pci", ATTR{vendor}=="0x10de", ATTR{class}=="0x030000", TEST=="power/control", ATTR{power/control}="auto"
ACTION=="bind", SUBSYSTEM=="pci", ATTR{vendor}=="0x10de", ATTR{class}=="0x030200", TEST=="power/control", ATTR{power/control}="auto"
# Disable runtime PM for NVIDIA VGA/3D controller devices on driver unbind
ACTION=="unbind", SUBSYSTEM=="pci", ATTR{vendor}=="0x10de", ATTR{class}=="0x030000", TEST=="power/control", ATTR{power/control}="on"
ACTION=="unbind", SUBSYSTEM=="pci", ATTR{vendor}=="0x10de", ATTR{class}=="0x030200", TEST=="power/control", ATTR{power/control}="on"
'''
XORG_PATH = '/etc/X11/xorg.conf'
XORG_INTEL = '''# Automatically generated by EnvyControl
Section "ServerLayout"
Identifier "layout"
Screen 0 "nvidia"
Inactive "intel"
EndSection
Section "Device"
Identifier "nvidia"
Driver "nvidia"
BusID "{}"
EndSection
Section "Screen"
Identifier "nvidia"
Device "nvidia"
Option "AllowEmptyInitialConfiguration"
EndSection
Section "Device"
Identifier "intel"
Driver "modesetting"
EndSection
Section "Screen"
Identifier "intel"
Device "intel"
EndSection
'''
XORG_AMD = '''# Automatically generated by EnvyControl
Section "ServerLayout"
Identifier "layout"
Screen 0 "nvidia"
Inactive "amdgpu"
EndSection
Section "Device"
Identifier "nvidia"
Driver "nvidia"
BusID "{}"
EndSection
Section "Screen"
Identifier "nvidia"
Device "nvidia"
Option "AllowEmptyInitialConfiguration"
EndSection
Section "Device"
Identifier "amdgpu"
Driver "amdgpu"
EndSection
Section "Screen"
Identifier "amd"
Device "amdgpu"
EndSection
'''
EXTRA_XORG_PATH = '/etc/X11/xorg.conf.d/10-nvidia.conf'
EXTRA_XORG_CONTENT = '''# Automatically generated by EnvyControl
Section "OutputClass"
Identifier "nvidia"
MatchDriver "nvidia-drm"
Driver "nvidia"
'''
FORCE_COMP = ' Option "ForceCompositionPipeline" "true"\n'
COOLBITS = ' Option "Coolbits" "{}"\n'
MODESET_PATH = '/etc/modprobe.d/nvidia.conf'
MODESET_CONTENT = '''# Automatically generated by EnvyControl
options nvidia-drm modeset=1
options nvidia NVreg_UsePageAttributeTable=1 NVreg_InitializeSystemMemoryAllocations=0
'''
MODESET_CURRENT_CONTENT = '''# Automatically generated by EnvyControl
options nvidia-current-drm modeset=1
options nvidia-current NVreg_UsePageAttributeTable=1 NVreg_InitializeSystemMemoryAllocations=0
'''
MODESET_RTD3 = '''# Automatically generated by EnvyControl
options nvidia-drm modeset=1
options nvidia "NVreg_DynamicPowerManagement=0x0{}"
options nvidia NVreg_UsePageAttributeTable=1 NVreg_InitializeSystemMemoryAllocations=0
'''
MODESET_CURRENT_RTD3 = '''# Automatically generated by EnvyControl
options nvidia-current-drm modeset=1
options nvidia-current "NVreg_DynamicPowerManagement=0x0{}"
options nvidia-current NVreg_UsePageAttributeTable=1 NVreg_InitializeSystemMemoryAllocations=0
'''
SDDM_XSETUP_PATH = '/usr/share/sddm/scripts/Xsetup'
SDDM_XSETUP_CONTENT = '''#!/bin/sh
# Xsetup - run as root before the login dialog appears
'''
LIGHTDM_SCRIPT_PATH = '/etc/lightdm/nvidia.sh'
LIGHTDM_CONFIG_PATH = '/etc/lightdm/lightdm.conf.d/20-nvidia.conf'
LIGHTDM_CONFIG_CONTENT = '''# Automatically generated by EnvyControl
[Seat:*]
display-setup-script=/etc/lightdm/nvidia.sh
'''
NVIDIA_XRANDR_SCRIPT = '''#!/bin/sh
# Automatically generated by EnvyControl
xrandr --setprovideroutputsource "{}" NVIDIA-0
xrandr --auto
'''
SUPPORTED_MODES = ['integrated', 'hybrid', 'nvidia']
SUPPORTED_DISPLAY_MANAGERS = ['gdm', 'gdm3', 'sddm', 'lightdm']
RTD3_MODES = [0, 1, 2, 3]
# end constants definition
def graphics_mode_switcher(graphics_mode, user_display_manager, enable_force_comp, coolbits_value, rtd3_value, use_nvidia_current):
print(f"Switching to {graphics_mode} mode")
if graphics_mode == 'integrated':
if logging.getLogger().level == logging.DEBUG:
service = subprocess.run(
["systemctl", "disable", "nvidia-persistenced.service"])
else:
service = subprocess.run(
["systemctl", "disable", "nvidia-persistenced.service"],
stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL)
if service.returncode == 0:
print('Successfully disabled nvidia-persistenced.service')
else:
logging.error("An error ocurred while disabling service")
cleanup()
# blacklist all nouveau and Nvidia modules
create_file(BLACKLIST_PATH, BLACKLIST_CONTENT)
# power off the Nvidia GPU with udev rules
create_file(UDEV_INTEGRATED_PATH, UDEV_INTEGRATED)
rebuild_initramfs()
elif graphics_mode == 'hybrid':
print(
f"Enable PCI-Express Runtime D3 (RTD3) Power Management: {rtd3_value or False}")
cleanup()
if logging.getLogger().level == logging.DEBUG:
service = subprocess.run(
["systemctl", "enable", "nvidia-persistenced.service"])
else:
service = subprocess.run(
["systemctl", "enable", "nvidia-persistenced.service"],
stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL)
if service.returncode == 0:
print('Successfully enabled nvidia-persistenced.service')
else:
logging.error("An error ocurred while enabling service")
if rtd3_value == None:
if use_nvidia_current:
create_file(MODESET_PATH, MODESET_CURRENT_CONTENT)
else:
create_file(MODESET_PATH, MODESET_CONTENT)
else:
# setup rtd3
if use_nvidia_current:
create_file(
MODESET_PATH, MODESET_CURRENT_RTD3.format(rtd3_value))
else:
create_file(MODESET_PATH, MODESET_RTD3.format(rtd3_value))
create_file(UDEV_PM_PATH, UDEV_PM_CONTENT)
rebuild_initramfs()
elif graphics_mode == 'nvidia':
print(f"Enable ForceCompositionPipeline: {enable_force_comp}")
print(f"Enable Coolbits: {coolbits_value or False}")
if logging.getLogger().level == logging.DEBUG:
service = subprocess.run(
["systemctl", "enable", "nvidia-persistenced.service"])
else:
service = subprocess.run(
["systemctl", "enable", "nvidia-persistenced.service"],
stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL)
if service.returncode == 0:
print('Successfully enabled nvidia-persistenced.service')
else:
logging.error("An error ocurred while enabling service")
cleanup()
# get the Nvidia dGPU PCI bus
nvidia_gpu_pci_bus = get_nvidia_gpu_pci_bus()
# get iGPU vendor
igpu_vendor = get_igpu_vendor()
# create the X.org config
if igpu_vendor == 'intel':
create_file(XORG_PATH, XORG_INTEL.format(nvidia_gpu_pci_bus))
elif igpu_vendor == 'amd':
create_file(XORG_PATH, XORG_AMD.format(nvidia_gpu_pci_bus))
# enable modeset for Nvidia driver
if use_nvidia_current:
create_file(MODESET_PATH, MODESET_CURRENT_CONTENT)
else:
create_file(MODESET_PATH, MODESET_CONTENT)
# extra Xorg config
if enable_force_comp and coolbits_value != None:
create_file(EXTRA_XORG_PATH, EXTRA_XORG_CONTENT + FORCE_COMP +
COOLBITS.format(coolbits_value) + 'EndSection\n')
elif enable_force_comp:
create_file(EXTRA_XORG_PATH, EXTRA_XORG_CONTENT +
FORCE_COMP + 'EndSection\n')
elif coolbits_value != None:
create_file(EXTRA_XORG_PATH, EXTRA_XORG_CONTENT +
COOLBITS.format(coolbits_value) + 'EndSection\n')
# try to detect the display manager if not provided
if user_display_manager == None:
display_manager = get_display_manager()
else:
display_manager = user_display_manager
# only sddm and lightdm require further config
if display_manager == 'sddm':
# backup Xsetup
if os.path.exists(SDDM_XSETUP_PATH):
logging.info("Creating Xsetup backup")
with open(SDDM_XSETUP_PATH, mode='r', encoding='utf-8') as f:
create_file(SDDM_XSETUP_PATH+'.bak', f.read())
create_file(SDDM_XSETUP_PATH,
generate_xrandr_script(igpu_vendor), True)
elif display_manager == 'lightdm':
create_file(LIGHTDM_SCRIPT_PATH,
generate_xrandr_script(igpu_vendor), True)
create_file(LIGHTDM_CONFIG_PATH, LIGHTDM_CONFIG_CONTENT)
rebuild_initramfs()
print('Operation completed successfully')
print('Please reboot your computer for changes to take effect!')
def cleanup():
# define list of files to remove
to_remove = [
BLACKLIST_PATH,
UDEV_INTEGRATED_PATH,
UDEV_PM_PATH,
XORG_PATH,
EXTRA_XORG_PATH,
MODESET_PATH,
LIGHTDM_SCRIPT_PATH,
LIGHTDM_CONFIG_PATH,
# legacy files
'/etc/X11/xorg.conf.d/90-nvidia.conf',
'/lib/udev/rules.d/50-remove-nvidia.rules',
'/lib/udev/rules.d/80-nvidia-pm.rules'
]
# remove each file in the list
for file_path in to_remove:
try:
if os.path.exists(file_path):
os.remove(file_path)
logging.info(f"Removed file {file_path}")
except OSError as e:
# only warn if file exists (code 2)
if e.errno != 2:
logging.error(f"Failed to remove file '{file_path}': {e}")
# restore Xsetup backup if found
backup_path = SDDM_XSETUP_PATH + ".bak"
if os.path.exists(backup_path):
logging.info("Restoring Xsetup backup")
with open(backup_path, mode="r", encoding="utf-8") as f:
create_file(SDDM_XSETUP_PATH, f.read())
# remove backup
os.remove(backup_path)
logging.info(f"Removed file {backup_path}")
def get_nvidia_gpu_pci_bus():
lspci_output = subprocess.check_output(['lspci']).decode('utf-8')
for line in lspci_output.splitlines():
if 'NVIDIA' in line and ('VGA compatible controller' in line or '3D controller' in line):
# remove leading zeros
pci_bus_id = line.split()[0].replace("0000:", "")
logging.info(f"Found Nvidia GPU at {pci_bus_id}")
break
else:
logging.error("Could not find Nvidia GPU")
print("Try switching to hybrid mode first!")
sys.exit(1)
# need to return the BusID in 'PCI:bus:device:function' format
# also perform hexadecimal to decimal conversion
bus, device_function = pci_bus_id.split(":")
device, function = device_function.split(".")
return f"PCI:{int(bus, 16)}:{int(device, 16)}:{int(function, 16)}"
def get_igpu_vendor():
lspci_output = subprocess.check_output(["lspci"]).decode('utf-8')
for line in lspci_output.splitlines():
if 'VGA compatible controller' in line or 'Display controller' in line:
if 'Intel' in line:
logging.info("Found Intel iGPU")
return 'intel'
elif 'ATI' in line or 'AMD' in line or 'AMD/ATI' in line:
logging.info("Found AMD iGPU")
return 'amd'
logging.warning("Could not find Intel or AMD iGPU")
return None
def get_display_manager():
try:
with open('/etc/systemd/system/display-manager.service', 'r', encoding='utf-8') as f:
content = f.read()
match = re.search(r'ExecStart=(.+)\n', content)
if match:
# only return the final component of the path
display_manager = os.path.basename(match.group(1))
logging.info(f"Found {display_manager} Display Manager")
return display_manager
except FileNotFoundError:
logging.warning("Display Manager detection is not available")
def generate_xrandr_script(igpu_vendor):
if igpu_vendor == 'intel':
return NVIDIA_XRANDR_SCRIPT.format('modesetting')
elif igpu_vendor == 'amd':
amd_igpu_name = get_amd_igpu_name()
if amd_igpu_name != None:
return NVIDIA_XRANDR_SCRIPT.format(amd_igpu_name)
else:
return NVIDIA_XRANDR_SCRIPT.format('modesetting')
else:
return NVIDIA_XRANDR_SCRIPT.format('modesetting')
def get_amd_igpu_name():
if not os.path.exists('/usr/bin/xrandr'):
logging.warning(
"The 'xrandr' command is not available. Make sure the package is installed!")
return None
try:
xrandr_output = subprocess.check_output(
['xrandr', '--listproviders']).decode('utf-8')
except subprocess.CalledProcessError:
logging.warning(
"Failed to run the 'xrandr' command.")
pattern = re.compile(r'(name:).*(ATI*|AMD*|AMD\/ATI)*')
if pattern.findall(xrandr_output):
return re.search(pattern, xrandr_output).group(0)[5:]
else:
logging.warning(
"Could not find AMD iGPU in 'xrandr' output.")
return None
def rebuild_initramfs():
# OSTree systems first
if any(os.path.exists(dir) for dir in ['/ostree', '/sysroot/ostree']):
print('Rebuilding the initramfs with rpm-ostree...')
command = ['rpm-ostree', 'initramfs', '--enable', '--arg=--force']
# Debian and Ubuntu derivatives
elif os.path.exists('/etc/debian_version'):
command = ['update-initramfs', '-u', '-k', 'all']
# RHEL and SUSE derivatives
elif os.path.exists('/etc/redhat-release') or os.path.exists('/usr/bin/zypper'):
command = ['dracut', '--force', '--regenerate-all']
# EndeavourOS with dracut
elif os.path.exists('/usr/lib/endeavouros-release') and os.path.exists('/usr/bin/dracut'):
command = ['dracut-rebuild']
else:
command = []
if len(command) != 0:
print('Rebuilding the initramfs...')
if logging.getLogger().level == logging.DEBUG:
p = subprocess.run(command)
else:
p = subprocess.run(
command, stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL)
if p.returncode == 0:
print('Successfully rebuilt the initramfs!')
else:
logging.error("An error ocurred while rebuilding the initramfs")
def create_file(path, content, executable=False):
try:
# create the parent folders if needed
if not os.path.exists(os.path.dirname(path)):
os.makedirs(os.path.dirname(path))
with open(path, mode='w', encoding='utf-8') as f:
f.write(content)
logging.info(f"Created file {path}")
if logging.getLogger().level == logging.DEBUG:
print(content)
# add execution privilege
if executable:
subprocess.run(['chmod', '+x', path], stdout=subprocess.DEVNULL)
logging.info(f"Added execution privilege to file {path}")
except OSError as e:
logging.error(f"Failed to create file '{path}': {e}")
def assert_root():
if os.geteuid() != 0:
logging.error("This operation requires root privileges")
sys.exit(1)
def main():
# define CLI arguments
parser = argparse.ArgumentParser()
parser.add_argument('-v', '--version', action='version', version=VERSION,
help='Output the current version')
parser.add_argument('-q', '--query', action='store_true',
help='Query the current graphics mode')
parser.add_argument('-s', '--switch', type=str, metavar='MODE', action='store', choices=SUPPORTED_MODES,
help='Switch the graphics mode. Available choices: %(choices)s')
parser.add_argument('--dm', type=str, metavar='DISPLAY_MANAGER', action='store', choices=SUPPORTED_DISPLAY_MANAGERS,
help='Manually specify your Display Manager for Nvidia mode. Available choices: %(choices)s')
parser.add_argument('--force-comp', action='store_true',
help='Enable ForceCompositionPipeline on Nvidia mode')
parser.add_argument('--coolbits', type=int, nargs='?', metavar='VALUE', action='store', const=28,
help='Enable Coolbits on Nvidia mode. Default if specified: %(const)s')
parser.add_argument('--rtd3', type=int, nargs='?', metavar='VALUE', action='store', choices=RTD3_MODES, const=2,
help='Setup PCI-Express Runtime D3 (RTD3) Power Management on Hybrid mode. Available choices: %(choices)s. Default if specified: %(const)s')
parser.add_argument('--use-nvidia-current', action='store_true',
help='Use nvidia-current instead of nvidia for kernel modules')
parser.add_argument('--reset-sddm', action='store_true',
help='Restore default Xsetup file')
parser.add_argument('--reset', action='store_true',
help='Revert changes made by EnvyControl')
parser.add_argument('--cache-create', action='store_true',
help='Create cache used by EnvyControl; only works in hybrid mode')
parser.add_argument('--cache-delete', action='store_true',
help='Delete cache created by EnvyControl')
parser.add_argument('--cache-query', action='store_true',
help='Show cache created by EnvyControl')
parser.add_argument('--verbose', default=False, action='store_true',
help='Enable verbose mode')
# print help if no arg is provided
if len(sys.argv) == 1:
parser.print_help()
sys.exit(1)
args = parser.parse_args()
# log formatting
logging.basicConfig(format='%(levelname)s: %(message)s')
# set debug level for verbose mode
if args.verbose:
logging.getLogger().setLevel(logging.DEBUG)
if args.query:
mode = get_current_mode()
print(mode)
return
elif args.cache_create:
assert_root()
CachedConfig(args).create_cache_file()
return
elif args.cache_delete:
assert_root()
CachedConfig.delete_cache_file()
return
elif args.cache_query:
CachedConfig.show_cache_file()
return
if args.switch or args.reset_sddm or args.reset:
with CachedConfig(args).adapter():
if args.switch:
assert_root()
graphics_mode_switcher(
args.switch, args.dm,
args.force_comp, args.coolbits, args.rtd3, args.use_nvidia_current
)
elif args.reset_sddm:
assert_root()
create_file(SDDM_XSETUP_PATH, SDDM_XSETUP_CONTENT, True)
print('Operation completed successfully')
elif args.reset:
assert_root()
cleanup()
CachedConfig.delete_cache_file()
rebuild_initramfs()
print('Operation completed successfully')
class CachedConfig:
'''Adapter for config from CACHE_FILE_PATH'''
def __init__(self, app_args) -> None:
self.app_args = app_args
self.current_mode = get_current_mode()
@contextmanager
def adapter(self):
global get_nvidia_gpu_pci_bus
use_cache = os.path.exists(CACHE_FILE_PATH)
if self.is_hybrid(): # recreate cache file when in hybrid mode
self.create_cache_file()
if use_cache:
self.read_cache_file() # might not be in hybrid mode
# rebind function to use cached value instead of detection
get_nvidia_gpu_pci_bus = self.get_nvidia_gpu_pci_bus
yield # back to main ...
def create_cache_file(self):
if not self.is_hybrid():
raise ValueError(
'--cache-create requires that the system be in the hybrid Optimus mode')
self.nvidia_gpu_pci_bus = get_nvidia_gpu_pci_bus()
self.obj = self.create_cache_obj(self.nvidia_gpu_pci_bus)
self.write_cache_file()
def create_cache_obj(self, nvidia_gpu_pci_bus):
return {
'nvidia_gpu_pci_bus': nvidia_gpu_pci_bus
}
def is_hybrid(self):
return 'hybrid' == self.current_mode
def get_nvidia_gpu_pci_bus(self):
return self.nvidia_gpu_pci_bus
@staticmethod
def delete_cache_file():
os.remove(CACHE_FILE_PATH)
os.removedirs(os.path.dirname(CACHE_FILE_PATH))
logging.debug(f"Removed file {CACHE_FILE_PATH}")
def read_cache_file(self):
from json import loads
if os.path.exists(CACHE_FILE_PATH):
with open(CACHE_FILE_PATH, 'r', encoding='utf-8') as f:
content = f.read()
self.obj = loads(content)
self.nvidia_gpu_pci_bus = self.obj['nvidia_gpu_pci_bus']
elif self.is_hybrid():
self.nvidia_gpu_pci_bus = get_nvidia_gpu_pci_bus()
else:
raise ValueError(
'No cache present. Operation requires that the system be in the hybrid Optimus mode')
@staticmethod
def show_cache_file():
content = f'ERROR: Could not read {CACHE_FILE_PATH}'
if os.path.exists(CACHE_FILE_PATH):
with open(CACHE_FILE_PATH, 'r', encoding='utf-8') as f:
content = f.read()
print(content)
def write_cache_file(self):
from json import dump
os.makedirs(os.path.dirname(CACHE_FILE_PATH), exist_ok=True)
with open(CACHE_FILE_PATH, 'w', encoding='utf-8') as f:
dump(self.obj, fp=f, indent=4, sort_keys=False)
logging.debug(f"Created file {CACHE_FILE_PATH}")
def get_current_mode():
mode = 'hybrid'
if os.path.exists(BLACKLIST_PATH) and (os.path.exists(UDEV_INTEGRATED_PATH) or os.path.exists('/lib/udev/rules.d/50-remove-nvidia.rules')):
mode = 'integrated'
elif os.path.exists(XORG_PATH) and os.path.exists(MODESET_PATH):
mode = 'nvidia'
return mode
if __name__ == '__main__':
main()