[Bug 59841] [IVB cpu eDP] panel is broken due to 657445fe86 (eDP bpp clamping)

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=59841

--- Comment #137 from jkp <jkp at iki.fi> ---
Not sure if this is relevant or a different bug, but when booting to CSM mode
with one or two external monitors (in which case there's no image in the
internal monitor), occasionally I can't get past the login screen. Kernel log
from the latest case of this kind of failure:

[   33.150719] ------------[ cut here ]------------
[   33.150783] WARNING: CPU: 0 PID: 2865 at
drivers/gpu/drm/i915/intel_display.c:822 intel_wait_for_pipe_off+0xf6/0x1c
[   33.150784] pipe_off wait timed out
[   33.150829] Modules linked in: parport_pc(F) ppdev(F) lp(F) parport(F)
bnep(F) rfcomm(F) binfmt_misc(F) nls_iso8859
ec_hdmi(F) uvcvideo(F) ax88179_178a(F) snd_hda_codec_realtek(F)
videobuf2_vmalloc(F) usbnet(F) videobuf2_memops(F) mii
v(F) hid_multitouch(F) ath3k(F) snd_hda_intel(F) snd_hda_codec(F) snd_hwdep(F)
btusb(F) snd_pcm(F) joydev(F) bluetooth
ensor_hub(F) snd_page_alloc(F) snd_seq_midi(F) snd_seq_midi_event(F)
asus_nb_wmi(F) asus_wmi(F) snd_rawmidi(F) sparse_
ath9k(F) snd_seq_device(F) ath9k_common(F) snd_timer(F) ath9k_hw(F) ath(F)
mac80211(F) cfg80211(F) mac_hid(F) snd(F) p
e(F) serio_raw(F) hid_generic(F) usb_storage(F) usbhid(F) hid(F) wmi(F) ahci(F)
libahci(F) i915(F) video(F) i2c_algo_b
) [last unloaded: ipmi_msghandler]
[   33.150843] CPU: 0 PID: 2865 Comm: Xorg Tainted: GF       W    3.11.0 #4
[   33.150845] Hardware name: ASUSTeK COMPUTER INC. TX300CA/TX300CA, BIOS
TX300CA.207 01/03/2013
[   33.150851]  0000000000000009 ffff880114cc17b0 ffffffff816a76b9
ffff880114cc17f8
[   33.150855]  ffff880114cc17e8 ffffffff8104d2ac ffff880113980000
0000000000070008
[   33.150858]  00000000fffefb58 ffff880114cc1fd8 ffff8801186bb470
ffff880114cc1848
[   33.150859] Call Trace:
[   33.150870]  [<ffffffff816a76b9>] dump_stack+0x45/0x56
[   33.150877]  [<ffffffff8104d2ac>] warn_slowpath_common+0x8c/0xc0
[   33.150882]  [<ffffffff8104d39c>] warn_slowpath_fmt+0x4c/0x50
[   33.150914]  [<ffffffffa0071e86>] ? i915_read32+0x66/0x140 [i915]
[   33.150948]  [<ffffffffa009d1d6>] intel_wait_for_pipe_off+0xf6/0x1c0 [i915]
[   33.150977]  [<ffffffffa009d33e>] intel_disable_pipe+0x9e/0xb0 [i915]
[   33.151007]  [<ffffffffa009f696>] ironlake_crtc_disable+0xd6/0x8a0 [i915]
[   33.151036]  [<ffffffffa00a3f50>] __intel_set_mode+0x320/0x12b0 [i915]
[   33.151072]  [<ffffffffa00a6f66>] intel_set_mode+0x16/0x30 [i915]
[   33.151101]  [<ffffffffa00a7732>] intel_crtc_set_config+0x7b2/0x980 [i915]
[   33.151131]  [<ffffffffa001165d>] drm_mode_set_config_internal+0x5d/0xe0
[drm]
[   33.151147]  [<ffffffffa0065711>] drm_fb_helper_set_par+0x71/0xf0
[drm_kms_helper]
[   33.151153]  [<ffffffff81397fa5>] fb_set_var+0x1a5/0x470
[   33.151162]  [<ffffffff81255744>] ? __ext4_journal_stop+0x44/0xa0
[   33.151169]  [<ffffffff81085a39>] ? update_curr+0x99/0x180
[   33.151176]  [<ffffffff813a59d1>] fbcon_blank+0x1e1/0x2e0
[   33.151184]  [<ffffffff814119d4>] do_unblank_screen+0xb4/0x1e0
[   33.151191]  [<ffffffff814076c5>] complete_change_console+0x65/0xf0
[   33.151197]  [<ffffffff8140866a>] vt_ioctl+0xf1a/0x1120
[   33.151204]  [<ffffffff81150c94>] ? handle_mm_fault+0x264/0x5d0
[   33.151229]  [<ffffffffa000ab80>] ? drm_setmaster_ioctl+0x120/0x120 [drm]
[   33.151240]  [<ffffffff813fbd58>] tty_ioctl+0x278/0xb10
[   33.151246]  [<ffffffff816b217c>] ? __do_page_fault+0x27c/0x500
[   33.151252]  [<ffffffff8119f46c>] do_vfs_ioctl+0x8c/0x4f0
[   33.151257]  [<ffffffff8118fe81>] ? __sb_end_write+0x31/0x60
[   33.151264]  [<ffffffff8118de5e>] ? vfs_write+0x17e/0x1e0
[   33.151268]  [<ffffffff8119f961>] SyS_ioctl+0x91/0xb0
[   33.151276]  [<ffffffff816b6b46>] system_call_fastpath+0x1a/0x1f
[   33.151280] ---[ end trace 6371fc90ad43927d ]---
[   34.712112] [drm:intel_dp_complete_link_train] *ERROR* failed to train DP,
aborting
[   35.067421] [drm:cpt_verify_modeset] *ERROR* mode set failed: pipe A stuck

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