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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
97 .It Va drm.radeon.backlight
99 1 = enable, 0 = disable, -1 = auto (default)
102 If display backlight level can be controlled by the GPU (which is often
103 the case in notebooks), the sysctl
104 .Va hw.backlight_level
105 can be used to adjust the backlight level.
106 Permitted values are from 0 to the value returned from the
109 On older Radeon GPU models than the R600 series, the
110 .Va hw.backlight_level
113 sysctl variables are no longer available by default.
115 .Va drm.radeon.backlight
118 will force-enable native backlight control via the
119 sysctl variables in this case.
126 driver was first available for Linux.
129 .Va drm.radeon.fastfb
130 on RS690 chipsets can cause graphics corruption when hardware acceleration
132 Display backlight control with the
133 .Va hw.backlight_level
134 sysctl is only supported for chipsets using AtomBIOS (which includes some
135 R400 chipsets and all later generations).