How to disable drm/kms actions during boot?

[Matti Aarnio]

I have a display card + display combination that has recently had much problems
during system boot.  Some system versions boot just fine to very large text mode,
others create entirely black display.

Is there any way to forbid the DRM from doing "maximize the text display area"
operation at all during the boot?  I do want the DRM/KMS to happen latter, but
NOT during system boot!

   Best regards,  Matti Aarnio


>From black case:

  kernel: Linux version 2.6.31.1-48.fc12.x86_64 (mockbuild@xxxxxxxxxxxxxxxxxxxxxxxxxxx) (gcc version 4.4.1 20090923 (Red Hat 4.4.1-16) (GCC) ) #1 SMP Fri Sep 25 16:57:40 EDT 2009
  ....
 kernel: [drm] Initialized drm 1.1.0 20060810
 kernel: [drm] radeon defaulting to kernel modesetting.
 rsyslogd: [origin software="rsyslogd" swVersion="4.4.1" x-pid="1396" x-info="http://www.rsyslog.com";] (re)start
 kernel: [drm] radeon kernel modesetting enabled.
 kernel: ACPI: PCI Interrupt Link [APC3] enabled at IRQ 18
 kernel: radeon 0000:01:00.0: PCI INT A -> Link[APC3] -> GSI 18 (level, low) -> IRQ 18
 kernel: [drm] radeon: Initializing kernel modesetting.
 kernel: [drm] register mmio base: 0xC1000000
 kernel: [drm] register mmio size: 65536
 kernel: ATOM BIOS: 11X
 kernel: [drm] Clocks initialized !
 kernel: [drm] Detected VRAM RAM=512M, BAR=256M
 kernel: [drm] RAM width 128bits DDR
 kernel: [TTM] Zone  kernel: Available graphics memory: 1997734 kiB.
 kernel: [drm] radeon: 512M of VRAM memory ready
 kernel: [drm] radeon: 512M of GTT memory ready.
 kernel: [drm] Loading RV630 CP Microcode
 kernel: platform radeon_cp.0: firmware: requesting radeon/RV630_pfp.bin
 kernel: platform radeon_cp.0: firmware: requesting radeon/RV630_me.bin
 kernel: [drm] GART: num cpu pages 131072, num gpu pages 131072
 kernel: [drm] ring test succeeded in 0 usecs
 kernel: usb 1-7: new high speed USB device using ehci_hcd and address 6
 kernel: [drm] radeon: ib pool ready.
 kernel: [drm] ib test succeeded in 0 usecs
 kernel: [drm] radeon: kernel modesetting successfully initialized.
 kernel: [drm] Radeon Display Connectors
 kernel: [drm] Connector 0:
 kernel: [drm]   DVI-I
 kernel: [drm]   DDC: 0x7e50 0x7e50 0x7e54 0x7e54 0x7e58 0x7e58 0x7e5c 0x7e5c
 kernel: [drm]   Encoders:
 kernel: [drm]     DFP1: INTERNAL_KLDSCP_TMDS1
 kernel: [drm]     CRT2: INTERNAL_KLDSCP_DAC2
 kernel: [drm] Connector 1:
 kernel: [drm]   DIN
 kernel: [drm]   Encoders:
 kernel: [drm]     TV1: INTERNAL_KLDSCP_DAC2
 kernel: [drm] Connector 2:
 kernel: [drm]   DVI-I
 kernel: [drm]   DDC: 0x7e40 0x7e40 0x7e44 0x7e44 0x7e48 0x7e48 0x7e4c 0x7e4c
 kernel: [drm]   Encoders:
 kernel: [drm]     CRT1: INTERNAL_KLDSCP_DAC1
 kernel: [drm]     DFP2: INTERNAL_LVTM1
 kernel: usb 1-7: New USB device found, idVendor=05e3, idProduct=0605
 kernel: usb 1-7: New USB device strings: Mfr=0, Product=1, SerialNumber=0
 kernel: usb 1-7: Product: USB2.0 Hub
 kernel: usb 1-7: configuration #1 chosen from 1 choice
 kernel: hub 1-7:1.0: USB hub found
 kernel: hub 1-7:1.0: 4 ports detected
 kernel: [drm] fb mappable at 0xB0141000
 kernel: [drm] vram apper at 0xB0000000
 kernel: [drm] size 9216000
 kernel: [drm] fb depth is 24
 kernel: [drm]    pitch is 7680
 kernel: executing set pll
 kernel: executing set crtc timing
 kernel: [drm] TMDS-15: set mode 1920x1200 27
 kernel: Console: switching to colour frame buffer device 240x75
 kernel: fb0: radeondrmfb frame buffer device
 kernel: registered panic notifier
 kernel: [drm] Initialized radeon 2.0.0 20080528 for 0000:01:00.0 on minor 0
 kernel: work_for_cpu used greatest stack depth: 2672 bytes left
 kernel: dracut: Starting plymouth daemon
.....


And from case showing up the text console:

 kernel: Linux version 2.6.31-33.fc12.x86_64 (mockbuild@xxxxxxxxxxxxxxxxxxxxxxxxxxx) (gcc version 4.4.1 20090916 (Red Hat 4.4.1-14) (GCC) ) #1 SMP Thu Sep 17 15:40:43 EDT 2009
 .....
 kernel: [drm] Initialized drm 1.1.0 20060810
 kernel: [drm] radeon defaulting to kernel modesetting.
 kernel: [drm] radeon kernel modesetting enabled.
 kernel: ACPI: PCI Interrupt Link [APC3] enabled at IRQ 18
 kernel: radeon 0000:01:00.0: PCI INT A -> Link[APC3] -> GSI 18 (level, low) -> IRQ 18
 kernel: [drm] radeon: Initializing kernel modesetting.
 kernel: [drm] register mmio base: 0xC1000000
 kernel: [drm] register mmio size: 65536
 kernel: ATOM BIOS: 11X
 kernel: [drm] Clocks initialized !
 kernel: [TTM] Zone  kernel: Available graphics memory: 1997734 kiB.
 kernel: [drm] radeon: 512M of VRAM memory ready
 kernel: [drm] radeon: 512M of GTT memory ready.
 kernel: [drm] Loading RV630 CP Microcode
 kernel: platform radeon_cp.0: firmware: requesting radeon/RV630_pfp.bin
 kernel: platform radeon_cp.0: firmware: requesting radeon/RV630_me.bin
 kernel: [drm] GART: num cpu pages 131072, num gpu pages 131072
 kernel: usb 1-7: new high speed USB device using ehci_hcd and address 6
 kernel: [drm] ring test succeeded in 0 usecs
 kernel: [drm] radeon: ib pool ready.
 kernel: [drm] ib test succeeded in 0 usecs
 kernel: [drm] Radeon Display Connectors
 kernel: [drm] Connector 0:
 kernel: [drm]   DVI-I
 kernel: [drm]   DDC: 0x7e50 0x7e50 0x7e54 0x7e54 0x7e58 0x7e58 0x7e5c 0x7e5c
 kernel: [drm]   Encoders:
 kernel: [drm]     DFP1: INTERNAL_KLDSCP_TMDS1
 kernel: [drm]     CRT2: INTERNAL_KLDSCP_DAC2
 kernel: [drm] Connector 1:
 kernel: [drm]   DVI-I
 kernel: [drm]   DDC: 0x7e40 0x7e40 0x7e44 0x7e44 0x7e48 0x7e48 0x7e4c 0x7e4c
 kernel: [drm]   Encoders:
 kernel: [drm]     CRT1: INTERNAL_KLDSCP_DAC1
 kernel: [drm]     DFP2: INTERNAL_LVTM1
 kernel: usb 1-7: New USB device found, idVendor=05e3, idProduct=0605
 kernel: usb 1-7: New USB device strings: Mfr=0, Product=1, SerialNumber=0
 kernel: usb 1-7: Product: USB2.0 Hub
 kernel: usb 1-7: configuration #1 chosen from 1 choice
 kernel: hub 1-7:1.0: USB hub found
 kernel: hub 1-7:1.0: 4 ports detected
 kernel: [drm] fb mappable at 0xB0141000
 kernel: [drm] vram apper at 0xB0000000
 kernel: [drm] size 9216000
 kernel: [drm] fb depth is 24
 kernel: [drm]    pitch is 7680
 kernel: executing set pll
 kernel: executing set crtc timing
 kernel: [drm] TMDS-10: set mode 1920x1200 22
 kernel: Console: switching to colour frame buffer device 240x75
 kernel: fb0: radeondrmfb frame buffer device
 kernel: registered panic notifier
 kernel: [drm] radeon: kernel modesetting successfully initialized.
 kernel: [drm] Initialized radeon 2.0.0 20080528 for 0000:01:00.0 on minor 0
 kernel: work_for_cpu used greatest stack depth: 2656 bytes left
 kernel: dracut: Starting plymouth daemon



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