[elongl@elons-machine ~]$ sudo mhwd -i pci video-ati
Error: config 'video-ati' does not exist!
[elongl@elons-machine ~]$ sudo pacman -S lxdm xfce4-session
warning: xfce4-session-4.12.1-8.1 is up to date -- reinstalling
resolving dependencies...
looking for conflicting packages...

Packages (2) lxdm-0.5.3-6  xfce4-session-4.12.1-8.1

Total Download Size:   0.69 MiB
Total Installed Size:  2.85 MiB
Net Upgrade Size:      0.33 MiB

:: Proceed with installation? [Y/n] y
:: Retrieving packages...
 xfce4-session-4.12.1-8.1-x86_64                    606.0 KiB  47.4K/s 00:13 [############################################] 100%
 lxdm-0.5.3-6-x86_64                                 99.0 KiB  38.5K/s 00:03 [############################################] 100%
(2/2) checking keys in keyring                                               [############################################] 100%
(2/2) checking package integrity                                             [############################################] 100%
(2/2) loading package files                                                  [############################################] 100%
(2/2) checking for file conflicts                                            [############################################] 100%
(2/2) checking available disk space                                          [############################################] 100%
:: Processing package changes...
(1/2) installing lxdm                                                        [############################################] 100%
Optional dependencies for lxdm
    iso-codes: show language names in language chooser [installed]
    gnome-themes-standard: default GTK+ theme [installed]
(2/2) reinstalling xfce4-session                                             [############################################] 100%
:: Running post-transaction hooks...
(1/6) Updating icon theme caches...
(2/6) Reloading system manager configuration...
(3/6) Creating system user accounts...
(4/6) Creating temporary files...
(5/6) Arming ConditionNeedsUpdate...
(6/6) Updating the desktop file MIME type cache...