[Bug 68030] [Haswell] blank Screen with intel ddx on first use right after using fbdev ddx. Breaking SuSE Install

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=68030

--- Comment #31 from Chris Wilson <chris at chris-wilson.co.uk> ---
kernel commit c9976dcf55c8aaa7037427b239f15e5acfc01a3a
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Sun Sep 29 19:15:07 2013 +0100

    drm/i915: Only apply DPMS to the encoder if enabled

    The current test for an attached enabled encoder fails if we have
    multiple connectors aliased to the same encoder - both connectors
    believe they own the enabled encoder and so we attempt to both enable
    and disable DPMS on the encoder, leading to hilarity and an OOPs:

    [  354.803064] WARNING: CPU: 0 PID: 482 at
    /usr/src/linux/dist/3.11.2/drivers/gpu/drm/i915/intel_display.c:3869
intel_modeset_check_state+0x764/0x770 [i915]()
    [  354.803064] wrong connector dpms state
    [  354.803084] Modules linked in: nfsd auth_rpcgss oid_registry exportfs
nfs lockd sunrpc xt_nat iptable_nat nf_nat_ipv4 nf_nat xt_limit xt_LOG
xt_tcpudp nf_conntrack_ipv4 nf_defrag_ipv4 ipt_REJECT ipv6 xt_recent
xt_conntrack nf_conntrack iptable_filter ip_tables x_tables
snd_hda_codec_realtek snd_hda_codec_hdmi x86_pkg_temp_thermal snd_hda_intel
coretemp kvm_intel snd_hda_codec i915 kvm snd_hwdep snd_pcm_oss snd_mixer_oss
crc32_pclmul snd_pcm crc32c_intel e1000e intel_agp igb ghash_clmulni_intel
intel_gtt aesni_intel cfbfillrect aes_x86_64 cfbimgblt lrw cfbcopyarea
drm_kms_helper ptp video thermal processor gf128mul snd_page_alloc drm
snd_timer glue_helper 8250_pci snd pps_core ablk_helper agpgart cryptd sg
soundcore fan i2c_algo_bit sr_mod thermal_sys 8250 i2c_i801 serial_core
    hwmon cdrom i2c_core evdev button
    [  354.803086] CPU: 0 PID: 482 Comm: kworker/0:1 Not tainted 3.11.2 #1
    [  354.803087] Hardware name: Supermicro X10SAE/X10SAE, BIOS 1.00
05/03/2013 [  354.803091] Workqueue: events console_callback
    [  354.803092]  0000000000000009 ffff88023611db48 ffffffff814048ac
ffff88023611db90
    [  354.803093]  ffff88023611db80 ffffffff8103d4e3 ffff880230d82800
ffff880230f9b800
    [  354.803094]  ffff880230f99000 ffff880230f99448 ffff8802351c0e00
ffff88023611dbe0
    [  354.803094] Call Trace:
    [  354.803098]  [<ffffffff814048ac>] dump_stack+0x54/0x8d
    [  354.803101]  [<ffffffff8103d4e3>] warn_slowpath_common+0x73/0x90
    [  354.803103]  [<ffffffff8103d547>] warn_slowpath_fmt+0x47/0x50
    [  354.803109]  [<ffffffffa089f1be>] ?
intel_ddi_connector_get_hw_state+0x5e/0x110 [i915]
    [  354.803114]  [<ffffffffa0896974>] intel_modeset_check_state+0x764/0x770
[i915]
    [  354.803117]  [<ffffffffa08969bb>] intel_connector_dpms+0x3b/0x60 [i915]
    [  354.803120]  [<ffffffffa037e1d0>] drm_fb_helper_dpms.isra.11+0x120/0x160
[drm_kms_helper]
    [  354.803122]  [<ffffffffa037e24e>] drm_fb_helper_blank+0x3e/0x80
[drm_kms_helper]
    [  354.803123]  [<ffffffff812116c2>] fb_blank+0x52/0xc0
    [  354.803125]  [<ffffffff8121e04b>] fbcon_blank+0x21b/0x2d0
    [  354.803127]  [<ffffffff81062243>] ? update_rq_clock.part.74+0x13/0x30
    [  354.803129]  [<ffffffff81047486>] ? lock_timer_base.isra.30+0x26/0x50
    [  354.803130]  [<ffffffff810472b2>] ? internal_add_timer+0x12/0x40
    [  354.803131]  [<ffffffff81047f48>] ? mod_timer+0xf8/0x1c0
    [  354.803133]  [<ffffffff81266d61>] do_unblank_screen+0xa1/0x1c0
    [  354.803134]  [<ffffffff81268087>] poke_blanked_console+0xc7/0xd0
    [  354.803136]  [<ffffffff812681cf>] console_callback+0x13f/0x160
    [  354.803137]  [<ffffffff81053258>] process_one_work+0x148/0x3d0
    [  354.803138]  [<ffffffff81053f19>] worker_thread+0x119/0x3a0
    [  354.803140]  [<ffffffff81053e00>] ? manage_workers.isra.30+0x2a0/0x2a0
    [  354.803141]  [<ffffffff8105994b>] kthread+0xbb/0xc0
    [  354.803142]  [<ffffffff81059890>] ? kthread_create_on_node+0x120/0x120
    [  354.803144]  [<ffffffff8140b32c>] ret_from_fork+0x7c/0xb0
    [  354.803145]  [<ffffffff81059890>] ? kthread_create_on_node+0x120/0x120

    This regression goes back to the big modeset rework and the conversion
    to the new dpms helpers which started with:

    commit 5ab432ef4997ce32c9406721b37ef6e97e57dae1
    Author: Daniel Vetter <daniel.vetter at ffwll.ch>
    Date:   Sat Jun 30 08:59:56 2012 +0200

        drm/i915/hdmi: convert to encoder->disable/enable

    Fixes: igt/kms_flip/dpms-off-confusion
    Reported-and-tested-by: Wakko Warner <wakko at animx.eu.org>
    Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=68030
    Link:  http://lkml.kernel.org/r/20130928185023.GA21672@animx.eu.org
    Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
    Cc: stable at vger.kernel.org
    [danvet: Add regression citation, mention the igt testcase this fixes
    and slap a cc: stable on the patch.]
    Signed-off-by: Daniel Vetter <daniel.vetter at ffwll.ch>

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