2 .\" Copyright (c) 2015 The DragonFly Project. All rights reserved.
4 .\" Redistribution and use in source and binary forms, with or without
5 .\" modification, are permitted provided that the following conditions
8 .\" 1. Redistributions of source code must retain the above copyright
9 .\" notice, this list of conditions and the following disclaimer.
10 .\" 2. Redistributions in binary form must reproduce the above copyright
11 .\" notice, this list of conditions and the following disclaimer in
12 .\" the documentation and/or other materials provided with the
14 .\" 3. Neither the name of The DragonFly Project nor the names of its
15 .\" contributors may be used to endorse or promote products derived
16 .\" from this software without specific, prior written permission.
18 .\" THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19 .\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
20 .\" LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
21 .\" FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
22 .\" COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
23 .\" INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
24 .\" BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
25 .\" LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
26 .\" AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
27 .\" OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
28 .\" OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 .Nd Driver for AMD/ATI Radeon graphics chipsets
40 driver provides support for the AMD Radeon graphics chips.
45 for more information about how to make the console work with
48 Tunables can be set at the
50 prompt before booting the kernel or stored in
52 .Bl -tag -width "xxxxxx"
53 .It Va drm.radeon.no_wb
54 Disables AGP writeback for scratch registers.
55 .It Va drm.radeon.dynclks
56 Enable/Disable dynamic clocks
57 .\".It Va drm.radeon.r4xx_atom
59 .\".It Va drm.radeon.vram_limit
61 .\".It Va drm.radeon.agpmode
63 .\".It Va drm.radeon.gart_size
65 .\".It Va drm.radeon.benchmarking
67 .\".It Va drm.radeon.testing
69 .\".It Va drm.radeon.connector_table
71 .\".It Va drm.radeon.tv
73 .\".It Va drm.radeon.audio
75 .\".It Va drm.radeon.disp_priority
77 .\".It Va drm.radeon.hw_i2c
79 .\".It Va drm.radeon.pcie_gen2
82 Enable/Disable MSI (message signaled interrupts)
83 1 = enable, 0 = disable, -1 = auto (default)
84 .\".It Va drm.radeon.lockup_timeout
86 .It Va drm.radeon.fastfb
87 Direct FB access for IGP chips, which can significantly improve performance
88 for some applications.
89 This option only affects the RS690, RS780 and RS880 chipsets, and only
90 when no sideport memory is available.
91 1 = enable, 0 = disable (default)
93 DPM (dynamic power management) support.
94 1 = enable, 0 = disable, -1 = auto (default)
95 .\".It Va drm.radeon.aspm
99 If display backlight level can be controlled by the GPU (which is often
100 the case in notebooks), the sysctl
101 .Va hw.backlight_level
102 can be used to adjust the backlight level.
103 Permitted values are from 0 to the value returned from the
112 driver was first available for Linux.
115 .Va drm.radeon.fastfb
116 on RS690 chipsets can cause graphics corruption when hardware acceleration
118 Display backlight control with the
119 .Va hw.backlight_level
120 sysctl is only supported for chipsets using AtomBIOS (which includes some
121 R400 chipsets and all later generations).