2 VIA Integration Graphic Chip Console Framebuffer Driver
5 -----------------------
6 The console framebuffer driver is for graphics chips of
7 VIA UniChrome Family(CLE266, PM800 / CN400 / CN300,
8 P4M800CE / P4M800Pro / CN700 / VN800,
9 CX700 / VX700, K8M890, P4M890,
10 CN896 / P4M900, VX800)
13 ------------------------
18 640x480(60, 75, 85, 100, 120 Hz), 720x480(60 Hz),
19 720x576(60 Hz), 800x600(60, 75, 85, 100, 120 Hz),
20 848x480(60 Hz), 856x480(60 Hz), 1024x512(60 Hz),
21 1024x768(60, 75, 85, 100 Hz), 1152x864(75 Hz),
22 1280x768(60 Hz), 1280x960(60 Hz), 1280x1024(60, 75, 85 Hz),
23 1440x1050(60 Hz), 1600x1200(60, 75 Hz), 1280x720(60 Hz),
24 1920x1080(60 Hz), 1400x1050(60 Hz), 800x480(60 Hz)
26 color depth: 8 bpp, 16 bpp, 32 bpp supports.
28 Support 2D hardware accelerator.
30 [Using the viafb module]
31 -- -- --------------------
32 Start viafb with default settings:
35 Start viafb with with user options:
36 #modprobe viafb viafb_mode=800x600 viafb_bpp=16 viafb_refresh=60
37 viafb_active_dev=CRT+DVI viafb_dvi_port=DVP1
38 viafb_mode1=1024x768 viafb_bpp=16 viafb_refresh1=60
49 8, 16, 32 (default:32)
52 60, 75, 85, 100, 120 (default:60)
55 0 : expansion (default)
59 0 : LCD panel with LSB data format input (default)
60 1 : LCD panel with MSB data format input
63 0 : Resolution: 640x480, Channel: single, Dithering: Enable
64 1 : Resolution: 800x600, Channel: single, Dithering: Enable
65 2 : Resolution: 1024x768, Channel: single, Dithering: Enable (default)
66 3 : Resolution: 1280x768, Channel: single, Dithering: Enable
67 4 : Resolution: 1280x1024, Channel: dual, Dithering: Enable
68 5 : Resolution: 1400x1050, Channel: dual, Dithering: Enable
69 6 : Resolution: 1600x1200, Channel: dual, Dithering: Enable
71 8 : Resolution: 800x480, Channel: single, Dithering: Enable
72 9 : Resolution: 1024x768, Channel: dual, Dithering: Enable
73 10: Resolution: 1024x768, Channel: single, Dithering: Disable
74 11: Resolution: 1024x768, Channel: dual, Dithering: Disable
75 12: Resolution: 1280x768, Channel: single, Dithering: Disable
76 13: Resolution: 1280x1024, Channel: dual, Dithering: Disable
77 14: Resolution: 1400x1050, Channel: dual, Dithering: Disable
78 15: Resolution: 1600x1200, Channel: dual, Dithering: Disable
79 16: Resolution: 1366x768, Channel: single, Dithering: Disable
80 17: Resolution: 1024x600, Channel: single, Dithering: Enable
81 18: Resolution: 1280x768, Channel: dual, Dithering: Enable
82 19: Resolution: 1280x800, Channel: single, Dithering: Enable
85 0 : No 2D Hardware Acceleration
86 1 : 2D Hardware Acceleration (default)
89 0 : viafb_SAMM_ON disable (default)
90 1 : viafb_SAMM_ON enable
92 viafb_mode1: (secondary display device)
99 viafb_bpp1: (secondary display device)
100 8, 16, 32 (default:32)
102 viafb_refresh1: (secondary display device)
103 60, 75, 85, 100, 120 (default:60)
106 This option is used to specify active devices.(CRT, DVI, CRT+LCD...)
107 DVI stands for DVI or HDMI, E.g., If you want to enable HDMI,
108 set viafb_active_dev=DVI. In SAMM case, the previous of
109 viafb_active_dev is primary device, and the following is
113 To enable one device, such as DVI only, we can use:
114 modprobe viafb viafb_active_dev=DVI
115 To enable two devices, such as CRT+DVI:
116 modprobe viafb viafb_active_dev=CRT+DVI;
118 For DuoView case, we can use:
119 modprobe viafb viafb_active_dev=CRT+DVI
121 modprobe viafb viafb_active_dev=DVI+CRT...
124 If CRT is primary and DVI is secondary, we should use:
125 modprobe viafb viafb_active_dev=CRT+DVI viafb_SAMM_ON=1...
126 If DVI is primary and CRT is secondary, we should use:
127 modprobe viafb viafb_active_dev=DVI+CRT viafb_SAMM_ON=1...
129 viafb_display_hardware_layout:
130 This option is used to specify display hardware layout for CX700 chip.
133 3 : LCD+DVI (default)
134 4 : LCD1+LCD2 (internal + internal)
135 16: LCD1+ExternalLCD2 (internal + external)
138 This option is used to set second device memory size(MB) in SAMM case.
139 The minimal size is 16.
141 viafb_platform_epia_dvi:
142 This option is used to enable DVI on EPIA - M
143 0 : No DVI on EPIA - M (default)
147 When using 24 - Bit Bus Width Digital Interface,
148 this option should be set.
149 12: 12-Bit LVDS or 12-Bit TMDS (default)
150 24: 24-Bit LVDS or 24-Bit TMDS
152 viafb_device_lcd_dualedge:
153 When using Dual Edge Panel, this option should be set.
154 0 : No Dual Edge Panel (default)
158 This option is used to specify video output devices(CRT, DVI, LCD) for
161 To output video on DVI, we should use:
162 modprobe viafb viafb_video_dev=DVI...
165 This option is used to specify LCD output port,
166 available values are "DVP0" "DVP1" "DFP_HIGHLOW" "DFP_HIGH" "DFP_LOW".
167 for external LCD + external DVI on CX700(External LCD is on DVP0),
169 modprobe viafb viafb_lcd_port=DVP0...
172 1. CRT may not display properly for DuoView CRT & DVI display at
173 the "640x480" PAL mode with DVI overscan enabled.
174 2. SAMM stands for single adapter multi monitors. It is different from
175 multi-head since SAMM support multi monitor at driver layers, thus fbcon
176 layer doesn't even know about it; SAMM's second screen doesn't have a
177 device node file, thus a user mode application can't access it directly.
178 When SAMM is enabled, viafb_mode and viafb_mode1, viafb_bpp and
179 viafb_bpp1, viafb_refresh and viafb_refresh1 can be different.
180 3. When console is depending on viafbinfo1, dynamically change resolution
181 and bpp, need to call VIAFB specified ioctl interface VIAFB_SET_DEVICE
182 instead of calling common ioctl function FBIOPUT_VSCREENINFO since
183 viafb doesn't support multi-head well, or it will cause screen crush.
184 4. VX800 2D accelerator hasn't been supported in this driver yet. When
185 using driver on VX800, the driver will disable the acceleration
189 [Configure viafb with "fbset" tool]
190 -----------------------------------
191 "fbset" is an inbox utility of Linux.
192 1. Inquire current viafb information, type,
195 2. Set various resolutions and viafb_refresh rates,
196 # fbset <resolution-vertical_sync>
199 # fbset "1024x768-75"
201 # fbset -g 1024 768 1024 768 32
202 Check the file "/etc/fb.modes" to find display modes available.
204 3. Set the color depth,
205 # fbset -depth <value>
212 Add the following line to your grub.conf:
213 append = "video=viafb:viafb_mode=1024x768,viafb_bpp=32,viafb_refresh=85"