https://bugs.freedesktop.org/show_bug.cgi?id=63935
--- Comment #59 from Chu Viet Huong huongcvit@gmail.com --- Created attachment 84489 --> https://bugs.freedesktop.org/attachment.cgi?id=84489&action=edit create success dmesg attachment
After remove generic driver xf86-video-vesa, it work fine :)