Wrong resolution after resuming from sleep

view story

https://bbs.archlinux.org – I started having this weird problem some time ago, it's important to note that I haven't had this problem right after installing Arch. After waking my laptop from sleep I get a brief black screen with "ACPI: unable to dock" error message and then the desktop shows up but with a resolution of 1333x750 which oddly enough does not match any mode reported by xrandr, and I can't manually switch to any other resolution untill I either log off and logon or reboot the laptop.xrandr output:Screen 0: minimum 320 x 200, current 1600 x 900, maximum 8192 x 8192 LVDS1 connected 1600 (HowTos)