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1 | Intel 830M/845G/852GM/855GM/865G/915G Framebuffer driver | ||
2 | ================================================================ | ||
3 | |||
4 | A. Introduction | ||
5 | This is a framebuffer driver for various Intel 810/815 compatible | ||
6 | graphics devices. These would include: | ||
7 | |||
8 | Intel 830M | ||
9 | Intel 810E845G | ||
10 | Intel 852GM | ||
11 | Intel 855GM | ||
12 | Intel 865G | ||
13 | Intel 915G | ||
14 | |||
15 | B. List of available options | ||
16 | |||
17 | a. "video=intelfb" | ||
18 | enables the intelfb driver | ||
19 | |||
20 | Recommendation: required | ||
21 | |||
22 | b. "mode=<xres>x<yres>[-<bpp>][@<refresh>]" | ||
23 | select mode | ||
24 | |||
25 | Recommendation: user preference | ||
26 | (default = 1024x768-32@70) | ||
27 | |||
28 | c. "vram=<value>" | ||
29 | select amount of system RAM in MB to allocate for the video memory | ||
30 | if not enough RAM was already allocated by the BIOS. | ||
31 | |||
32 | Recommendation: 1 - 4 MB. | ||
33 | (default = 4 MB) | ||
34 | |||
35 | d. "voffset=<value>" | ||
36 | select at what offset in MB of the logical memory to allocate the | ||
37 | framebuffer memory. The intent is to avoid the memory blocks | ||
38 | used by standard graphics applications (XFree86). Depending on your | ||
39 | usage, adjust the value up or down, (0 for maximum usage, 63/127 MB | ||
40 | for the least amount). Note, an arbitrary setting may conflict | ||
41 | with XFree86. | ||
42 | |||
43 | Recommendation: do not set | ||
44 | (default = 48 MB) | ||
45 | |||
46 | e. "accel" | ||
47 | enable text acceleration. This can be enabled/reenabled anytime | ||
48 | by using 'fbset -accel true/false'. | ||
49 | |||
50 | Recommendation: enable | ||
51 | (default = set) | ||
52 | |||
53 | f. "hwcursor" | ||
54 | enable cursor acceleration. | ||
55 | |||
56 | Recommendation: enable | ||
57 | (default = set) | ||
58 | |||
59 | g. "mtrr" | ||
60 | enable MTRR. This allows data transfers to the framebuffer memory | ||
61 | to occur in bursts which can significantly increase performance. | ||
62 | Not very helpful with the intel chips because of 'shared memory'. | ||
63 | |||
64 | Recommendation: set | ||
65 | (default = set) | ||
66 | |||
67 | h. "fixed" | ||
68 | disable mode switching. | ||
69 | |||
70 | Recommendation: do not set | ||
71 | (default = not set) | ||
72 | |||
73 | The binary parameters can be unset with a "no" prefix, example "noaccel". | ||
74 | The default parameter (not named) is the mode. | ||
75 | |||
76 | C. Kernel booting | ||
77 | |||
78 | Separate each option/option-pair by commas (,) and the option from its value | ||
79 | with an equals sign (=) as in the following: | ||
80 | |||
81 | video=i810fb:option1,option2=value2 | ||
82 | |||
83 | Sample Usage | ||
84 | ------------ | ||
85 | |||
86 | In /etc/lilo.conf, add the line: | ||
87 | |||
88 | append="video=intelfb:800x600-32@75,accel,hwcursor,vram=8" | ||
89 | |||
90 | This will initialize the framebuffer to 800x600 at 32bpp and 75Hz. The | ||
91 | framebuffer will use 8 MB of System RAM. hw acceleration of text and cursor | ||
92 | will be enabled. | ||
93 | |||
94 | D. Module options | ||
95 | |||
96 | The module parameters are essentially similar to the kernel | ||
97 | parameters. The main difference is that you need to include a Boolean value | ||
98 | (1 for TRUE, and 0 for FALSE) for those options which don't need a value. | ||
99 | |||
100 | Example, to enable MTRR, include "mtrr=1". | ||
101 | |||
102 | Sample Usage | ||
103 | ------------ | ||
104 | |||
105 | Using the same setup as described above, load the module like this: | ||
106 | |||
107 | modprobe intelfb mode=800x600-32@75 vram=8 accel=1 hwcursor=1 | ||
108 | |||
109 | Or just add the following to /etc/modprobe.conf | ||
110 | |||
111 | options intelfb mode=800x600-32@75 vram=8 accel=1 hwcursor=1 | ||
112 | |||
113 | and just do a | ||
114 | |||
115 | modprobe intelfb | ||
116 | |||
117 | |||
118 | E. Acknowledgment: | ||
119 | |||
120 | 1. Geert Uytterhoeven - his excellent howto and the virtual | ||
121 | framebuffer driver code made this possible. | ||
122 | |||
123 | 2. Jeff Hartmann for his agpgart code. | ||
124 | |||
125 | 3. David Dawes for his original kernel 2.4 code. | ||
126 | |||
127 | 4. The X developers. Insights were provided just by reading the | ||
128 | XFree86 source code. | ||
129 | |||
130 | 5. Antonino A. Daplas for his inspiring i810fb driver. | ||
131 | |||
132 | 6. Andrew Morton for his kernel patches maintenance. | ||
133 | |||
134 | ########################### | ||
135 | Sylvain | ||