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    SubjectRe: Linux 2.6.33-rc2 - Blank screen for Intel KMS
    Date
    El Thu, 24 Dec 2009 14:00:24 -0800, Linus Torvalds escribió:

    Hi.

    I've upgraded from 2.6.32 and I get a blank screen when the system is
    starting KMS. My motherboard is an Intel DG43NB with onboard video. I
    traced back to the patch that stopped working on my system and it is
    patch-2.6.32-git7. patch-2.6.32-git6 works fine. From dmesg of git7 I see
    this:

    i915 0000:00:02.0: PCI INT A -> GSI 16 (level, low) -> IRQ 16
    i915 0000:00:02.0: setting latency timer to 64
    mtrr: type mismatch for c0000000,10000000 old: write-back new: write-
    combining
    [drm] MTRR allocation failed. Graphics performance may suffer.
    i915 0000:00:02.0: irq 28 for MSI/MSI-X
    [drm] set up 31M of stolen space
    ------------[ cut here ]------------
    WARNING: at drivers/gpu/drm/drm_crtc_helper.c:1035
    drm_helper_initial_config+0x5e/0x60 [drm_kms_helper]()
    Hardware name:
    No connectors reported connected with modes
    Modules linked in: i915(+) snd_hda_codec bttv(+) v4l2_common videodev
    ir_common videobuf_dma_sg videobuf_core drm_kms_helper snd_pcm btcx_risc
    uhci_hcd i2c_i801 tveeprom drm snd_timer i2c_algo_bit snd cfbcopyarea
    ehci_hcd psmouse video i2c_core soundcore e1000e sr_mod intel_agp usbcore
    backlight 8139too output cfbimgblt cfbfillrect snd_page_alloc cdrom
    agpgart evdev thermal rtc_cmos rtc_core rtc_lib button
    Pid: 628, comm: modprobe Not tainted 2.6.32-git7 #1
    Call Trace:
    [<c103215e>] ? warn_slowpath_common+0x6e/0xb0
    [<f8875abe>] ? drm_helper_initial_config+0x5e/0x60 [drm_kms_helper]
    [<c10321eb>] ? warn_slowpath_fmt+0x2b/0x30
    [<f8875abe>] ? drm_helper_initial_config+0x5e/0x60 [drm_kms_helper]
    [<f89a3a91>] ? i915_driver_load+0x1321/0x14c0 [i915]
    [<f89a2750>] ? i915_vga_set_decode+0x0/0x20 [i915]
    [<f87b8eaf>] ? drm_get_dev+0x29f/0x470 [drm]
    [<c10db051>] ? sysfs_do_create_link+0xa1/0x140
    [<f89cdc15>] ? i915_pci_probe+0x0/0x130 [i915]
    [<c112d6db>] ? local_pci_probe+0xb/0x10
    [<c112df29>] ? pci_device_probe+0x69/0x90
    [<c118ffeb>] ? driver_probe_device+0x7b/0x170
    [<c112d848>] ? pci_match_device+0xa8/0xc0
    [<c1190159>] ? __driver_attach+0x79/0x80
    [<c11900e0>] ? __driver_attach+0x0/0x80
    [<c118f8b2>] ? bus_for_each_dev+0x52/0x80
    [<c118fe86>] ? driver_attach+0x16/0x20
    [<c11900e0>] ? __driver_attach+0x0/0x80
    [<c118f1d1>] ? bus_add_driver+0xa1/0x250
    [<c112de60>] ? pci_device_remove+0x0/0x40
    [<c11903f3>] ? driver_register+0x63/0x110
    [<f87b434d>] ? drm_init+0x2d/0xf0 [drm]
    [<f89df000>] ? i915_init+0x0/0x48 [i915]
    [<c112e16d>] ? __pci_register_driver+0x3d/0xb0
    [<c100112f>] ? do_one_initcall+0x2f/0x190
    [<c105c002>] ? sys_init_module+0xb2/0x220
    [<c10961b1>] ? sys_read+0x41/0x70
    [<c1002ed0>] ? sysenter_do_call+0x12/0x26
    ---[ end trace 03d4bb0d67069a6a ]---
    [drm] Initialized i915 1.6.0 20080730 for 0000:00:02.0 on minor 0


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