This commit breaks loading nouveau on my optimus laptop. I get the following spam in dmesg:
[ 24.102587] MXM: GUID detected in BIOS [ 24.103167] ACPI Exception: AE_AML_PACKAGE_LIMIT, Index (0x000000003) is beyond end of object (length 0x0) (20131218/exoparg2-420) [ 24.103242] ACPI Error: Method parse/execution failed [\_SB_.PCI0.VGA_._DSM] (Node ffff88007c82e1e0), AE_AML_PACKAGE_LIMIT (20131218/psparse-536) [ 24.103354] ACPI: \_SB_.PCI0.VGA_: failed to evaluate _DSM (0x300b) [ 24.103964] ACPI Exception: AE_AML_PACKAGE_LIMIT, Index (0x000000003) is beyond end of object (length 0x0) (20131218/exoparg2-420) [ 24.104056] ACPI Error: Method parse/execution failed [\_SB_.PCI0.VGA_._DSM] (Node ffff88007c82e1e0), AE_AML_PACKAGE_LIMIT (20131218/psparse-536) [ 24.104133] ACPI Error: Method parse/execution failed [\_SB_.PCI0.P0P4.GFX0._DSM] (Node ffff88007c82e050), AE_AML_PACKAGE_LIMIT (20131218/psparse-536) [ 24.104247] ACPI: \_SB_.PCI0.P0P4.GFX0: failed to evaluate _DSM (0x300b) [ 24.108761] nouveau 0000:04:00.0: enabling device (0004 -> 0007) [ 24.135000] [drm] hdmi device not found 4 0 1 [ 24.135950] nouveau D[ DEVICE][0000:04:00.0] initialised [ 24.136581] nouveau [ DEVICE][0000:04:00.0] BOOT0 : 0x0a8b00b1 [ 24.136594] nouveau [ DEVICE][0000:04:00.0] Chipset: GT218 (NVA8) [ 24.136649] nouveau [ DEVICE][0000:04:00.0] Family : NV50 [ 24.136661] nouveau D[ DEVICE][0000:04:00.0] crystal freq: 27000KHz [ 24.145003] nouveau [ VBIOS][0000:04:00.0] checking PRAMIN for image... [ 24.145085] nouveau [ VBIOS][0000:04:00.0] ... signature not found [ 24.145143] nouveau [ VBIOS][0000:04:00.0] checking PROM for image... [ 24.145196] nouveau [ VBIOS][0000:04:00.0] ... signature not found [ 24.145241] nouveau [ VBIOS][0000:04:00.0] checking ACPI for image... [ 24.145252] nouveau [ VBIOS][0000:04:00.0] ... signature not found [ 24.145262] nouveau [ VBIOS][0000:04:00.0] checking PCIROM for image... [ 24.145638] nouveau 0000:04:00.0: Invalid ROM contents [ 24.146181] nouveau [ VBIOS][0000:04:00.0] ... signature not found [ 24.146195] nouveau [ VBIOS][0000:04:00.0] checking PLATFORM for image... [ 24.146253] nouveau [ VBIOS][0000:04:00.0] ... signature not found [ 24.146264] nouveau E[ VBIOS][0000:04:00.0] unable to locate usable image [ 24.146469] nouveau E[ DEVICE][0000:04:00.0] failed to create 0x10000001, -22 [ 24.146676] nouveau E[ DRM] failed to create 0x80000080, -22 Reverting b072e53b0a27a makes this problem go away. dmesg after reverting: [ 23.470101] MXM: GUID detected in BIOS [ 23.470239] ACPI Warning: \_SB_.PCI0.VGA_._DSM: Argument #4 type mismatch - Found [Integer], ACPI requires [Package] (20131218/nsarguments-95) [ 23.470473] ACPI Warning: \_SB_.PCI0.VGA_._DSM: Argument #4 type mismatch - Found [Buffer], ACPI requires [Package] (20131218/nsarguments-95) [ 23.472101] ACPI Warning: \_SB_.PCI0.VGA_._DSM: Argument #4 type mismatch - Found [Buffer], ACPI requires [Package] (20131218/nsarguments-95) [ 23.473582] i915 0000:00:02.0: optimus capabilities: enabled, status dynamic power, hda bios codec supported [ 23.473699] ACPI Warning: \_SB_.PCI0.P0P4.GFX0._DSM: Argument #4 type mismatch - Found [Integer], ACPI requires [Package] (20131218/nsarguments-95) [ 23.474185] ACPI Warning: \_SB_.PCI0.P0P4.GFX0._DSM: Argument #4 type mismatch - Found [Buffer], ACPI requires [Package] (20131218/nsarguments-95) [ 23.475552] ACPI Warning: \_SB_.PCI0.P0P4.GFX0._DSM: Argument #4 type mismatch - Found [Buffer], ACPI requires [Package] (20131218/nsarguments-95) [ 23.479677] pci 0000:04:00.0: optimus capabilities: enabled, status dynamic power, hda bios codec supported [ 23.479756] VGA switcheroo: detected Optimus DSM method \_SB_.PCI0.P0P4.GFX0 handle [ 23.483963] nouveau 0000:04:00.0: enabling device (0004 -> 0007) [ 23.529744] [drm] hdmi device not found 4 0 1 [ 23.531950] nouveau D[ DEVICE][0000:04:00.0] initialised [ 23.532587] nouveau [ DEVICE][0000:04:00.0] BOOT0 : 0x0a8b00b1 [ 23.532600] nouveau [ DEVICE][0000:04:00.0] Chipset: GT218 (NVA8) [ 23.532666] nouveau [ DEVICE][0000:04:00.0] Family : NV50 [ 23.532677] nouveau D[ DEVICE][0000:04:00.0] crystal freq: 27000KHz [ 23.546686] nouveau [ VBIOS][0000:04:00.0] checking PRAMIN for image... [ 23.547243] nouveau [ VBIOS][0000:04:00.0] ... signature not found [ 23.547257] nouveau [ VBIOS][0000:04:00.0] checking PROM for image... [ 23.547338] nouveau [ VBIOS][0000:04:00.0] ... signature not found [ 23.547348] nouveau [ VBIOS][0000:04:00.0] checking ACPI for image... [ 23.568444] asus_wmi: ASUS WMI generic driver loaded [ 23.868084] ppdev: user-space parallel port driver [ 23.891268] asus_wmi: Initialization: 0x0 [ 23.891700] asus_wmi: BIOS WMI version: 0.6 [ 23.892578] asus_wmi: SFUN value: 0x0 [ 24.203132] nouveau [ VBIOS][0000:04:00.0] ... appears to be valid [ 24.203148] nouveau [ VBIOS][0000:04:00.0] using image from ACPI
