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27 struct i915_params i915 __read_mostly = {
29 .panel_ignore_lid = 1,
33 .lvds_channel_mode = 0,
35 .vbt_sdvo_panel_type = -1,
38 .enable_hangcheck = true,
41 .preliminary_hw_support = IS_ENABLED(CONFIG_DRM_I915_PRELIMINARY_HW_SUPPORT),
42 .disable_power_well = 1,
45 .prefault_disable = 0,
47 .invert_brightness = 0,
49 .enable_cmd_parser = 1,
53 module_param_named(modeset, i915.modeset, int, 0400);
54 MODULE_PARM_DESC(modeset,
55 "Use kernel modesetting [KMS] (0=DRM_I915_KMS from .config, "
56 "1=on, -1=force vga console preference [default])");
58 module_param_named(panel_ignore_lid, i915.panel_ignore_lid, int, 0600);
59 MODULE_PARM_DESC(panel_ignore_lid,
60 "Override lid status (0=autodetect, 1=autodetect disabled [default], "
61 "-1=force lid closed, -2=force lid open)");
63 module_param_named(powersave, i915.powersave, int, 0600);
64 MODULE_PARM_DESC(powersave,
65 "Enable powersavings, fbc, downclocking, etc. (default: true)");
67 module_param_named(semaphores, i915.semaphores, int, 0400);
68 MODULE_PARM_DESC(semaphores,
69 "Use semaphores for inter-ring sync "
70 "(default: -1 (use per-chip defaults))");
72 module_param_named(enable_rc6, i915.enable_rc6, int, 0400);
73 MODULE_PARM_DESC(enable_rc6,
74 "Enable power-saving render C-state 6. "
75 "Different stages can be selected via bitmask values "
76 "(0 = disable; 1 = enable rc6; 2 = enable deep rc6; 4 = enable deepest rc6). "
77 "For example, 3 would enable rc6 and deep rc6, and 7 would enable everything. "
78 "default: -1 (use per-chip default)");
80 module_param_named(enable_fbc, i915.enable_fbc, int, 0600);
81 MODULE_PARM_DESC(enable_fbc,
82 "Enable frame buffer compression for power savings "
83 "(default: -1 (use per-chip default))");
85 module_param_named(lvds_downclock, i915.lvds_downclock, int, 0400);
86 MODULE_PARM_DESC(lvds_downclock,
87 "Use panel (LVDS/eDP) downclocking for power savings "
90 module_param_named(lvds_channel_mode, i915.lvds_channel_mode, int, 0600);
91 MODULE_PARM_DESC(lvds_channel_mode,
92 "Specify LVDS channel mode "
93 "(0=probe BIOS [default], 1=single-channel, 2=dual-channel)");
95 module_param_named(lvds_use_ssc, i915.panel_use_ssc, int, 0600);
96 MODULE_PARM_DESC(lvds_use_ssc,
97 "Use Spread Spectrum Clock with panels [LVDS/eDP] "
98 "(default: auto from VBT)");
100 module_param_named(vbt_sdvo_panel_type, i915.vbt_sdvo_panel_type, int, 0600);
101 MODULE_PARM_DESC(vbt_sdvo_panel_type,
102 "Override/Ignore selection of SDVO panel mode in the VBT "
103 "(-2=ignore, -1=auto [default], index in VBT BIOS table)");
105 module_param_named(reset, i915.reset, bool, 0600);
106 MODULE_PARM_DESC(reset, "Attempt GPU resets (default: true)");
108 module_param_named(enable_hangcheck, i915.enable_hangcheck, bool, 0644);
109 MODULE_PARM_DESC(enable_hangcheck,
110 "Periodically check GPU activity for detecting hangs. "
111 "WARNING: Disabling this can cause system wide hangs. "
114 module_param_named(enable_ppgtt, i915.enable_ppgtt, int, 0400);
115 MODULE_PARM_DESC(enable_ppgtt,
116 "Override PPGTT usage. "
117 "(-1=auto [default], 0=disabled, 1=aliasing, 2=full)");
119 module_param_named(enable_psr, i915.enable_psr, int, 0600);
120 MODULE_PARM_DESC(enable_psr, "Enable PSR (default: false)");
122 module_param_named(preliminary_hw_support, i915.preliminary_hw_support, int, 0600);
123 MODULE_PARM_DESC(preliminary_hw_support,
124 "Enable preliminary hardware support.");
126 module_param_named(disable_power_well, i915.disable_power_well, int, 0600);
127 MODULE_PARM_DESC(disable_power_well,
128 "Disable the power well when possible (default: true)");
130 module_param_named(enable_ips, i915.enable_ips, int, 0600);
131 MODULE_PARM_DESC(enable_ips, "Enable IPS (default: true)");
133 module_param_named(fastboot, i915.fastboot, bool, 0600);
134 MODULE_PARM_DESC(fastboot,
135 "Try to skip unnecessary mode sets at boot time (default: false)");
137 module_param_named(prefault_disable, i915.prefault_disable, bool, 0600);
138 MODULE_PARM_DESC(prefault_disable,
139 "Disable page prefaulting for pread/pwrite/reloc (default:false). "
140 "For developers only.");
142 module_param_named(invert_brightness, i915.invert_brightness, int, 0600);
143 MODULE_PARM_DESC(invert_brightness,
144 "Invert backlight brightness "
145 "(-1 force normal, 0 machine defaults, 1 force inversion), please "
146 "report PCI device ID, subsystem vendor and subsystem device ID "
147 "to dri-devel@lists.freedesktop.org, if your machine needs it. "
148 "It will then be included in an upcoming module version.");
150 module_param_named(disable_display, i915.disable_display, bool, 0600);
151 MODULE_PARM_DESC(disable_display, "Disable display (default: false)");
153 module_param_named(disable_vtd_wa, i915.disable_vtd_wa, bool, 0600);
154 MODULE_PARM_DESC(disable_vtd_wa, "Disable all VT-d workarounds (default: false)");
156 module_param_named(enable_cmd_parser, i915.enable_cmd_parser, int, 0600);
157 MODULE_PARM_DESC(enable_cmd_parser,
158 "Enable command parsing (1=enabled [default], 0=disabled)");