[SOLVED]some questions about ODROID-X video card resolution

[wgs13579]

hi,
i'm a new ODROIX-X user.
i have installed the Arch Linux image ,X11 and Xfce follow the site:
http://archlinuxarm.org/platforms/armv7/odroid-xx2

and my monitor display the Xfce Destop Environment.

but, the resolution is fixed(1920x1080), that is to say, i can't change my resolution from the Destop Environment.

and then i try to change it from the console by changing the /etc/X11/xorg.conf:

$this->bbcode_second_pass_code('', '
Section "Monitor"
Identifier "Monitor0"
Modeline "1600x1200_60.00" 160.96 1600 1704 1880 2160 1200 1201 1204 1242
-HSync +Vsync
EndSection

Section "Screen"
Identifier "Default Screen"
Device "HDMI"
SubSection "Display"
Depth 16
Modes "1920x1080" "1600x1200"
EndSubSection
EndSection
')

that has no effect. any one have some ideas to solve this question?

thanks.

[xenoxaos]

That's because the SoC only supports 1080p and 720p.

[wgs13579]

today, I study the framebuffer driver more closely and find that if want to change the resolution, the video driver must supply two special functions in struct fb_info->struct fb_ops:
$this->bbcode_second_pass_code('', '
int (*fb_check_var)(struct fb_var_screeninfo *var, struct fb_info *info);
int (*fb_set_par)(struct fb_info *info);
')


so, I check the Arch linux kernel. Indeed it doesn't supply the functions in Mixer driver which register the framebuffer deivce.

above is my personally opinion. But seems to explain my problems.