drm_edid_block_valid在 中经常出现dmesg，我正在寻找启动过程缓慢的原因。输出如下：
[ 13.884900] audit: type=1400 audit(1467376765.370:11): apparmor="STATUS" operation="profile_load" profile="unconfined" name="/usr/sbin/cupsd" pid=627 comm="apparmor_parser"
[ 17.774473] [drm:drm_edid_block_valid [drm]] *ERROR* EDID checksum is invalid, remainder is 209
[ 17.774484] Raw EDID:
[ 17.774486] 00 ff ff ff ff ff ff 00 22 f0 54 29 01 01 01 01
[ 17.774486] 1b 17 01 04 a5 34 20 78 23 4c a5 a7 55 4d a2 26
[ 17.774487] 10 50 54 21 08 00 d1 c0 81 c0 81 40 81 80 95 00
[ 17.774488] a9 40 b3 00 01 00 d1 c0 81 c0 81 40 81 80 95 00
[ 17.774488] 36 00 06 44 21 00 00 1a 00 00 00 fd 00 18 3c 18
[ 17.774489] 50 11 00 0a 20 20 20 20 20 20 00 00 00 fc 00 48
[ 17.774490] 50 20 5a 52 32 34 34 30 77 0a 20 20 00 00 00 ff
[ 17.774490] 00 43 4e 34 33 32 37 30 4a 4c 5a 0a 20 20 01 a6
[ 22.023647] cgroup: new mount options do not match the existing superblock, will be ignored
还有这个：
[ 35.700972] WARNING: CPU: 2 PID: 498 at /build/linux-BvkamA/linux-4.4.0/drivers/gpu/drm/i915/intel_display.c:1144 intel_disable_pipe+0x2b6/0x2c0 [i915]()
[ 35.700973] pipe_off wait timed out
[ 35.700974] Modules linked in: intel_rapl x86_pkg_temp_thermal intel_powerclamp snd_hda_codec_hdmi snd_hda_codec_realtek snd_hda_codec_generic snd_hda_intel coretemp input_leds joydev snd_hda_codec snd_hda_core kvm snd_hwdep snd_pcm irqbypass snd_seq_midi snd_seq_midi_event snd_rawmidi crct10dif_pclmul snd_seq crc32_pclmul snd_seq_device snd_timer hp_wmi ie31200_edac sparse_keymap aesni_intel edac_core snd aes_x86_64 soundcore lpc_ich serio_raw lrw gf128mul glue_helper ablk_helper 8250_fintek mac_hid tpm_infineon cryptd parport_pc ppdev lp parport autofs4 hid_generic usbhid hid i915 i2c_algo_bit drm_kms_helper syscopyarea sysfillrect e1000e sysimgblt psmouse fb_sys_fops ahci drm libahci ptp pps_core wmi fjes video
[ 35.700999] CPU: 2 PID: 498 Comm: plymouthd Not tainted 4.4.0-28-generic #47-Ubuntu
[ 35.701000] Hardware name: Hewlett-Packard HP Compaq Elite 8300 SFF/3397, BIOS K01 v02.90 07/16/2013
[ 35.701001] 0000000000000286 000000000d3335aa ffff88040aa0bac8 ffffffff813eb1a3
[ 35.701003] ffff88040aa0bb10 ffffffffc027ca70 ffff88040aa0bb00 ffffffff81081102
[ 35.701004] ffff880035a10000 0000000000071008 00000000fffefde4 0000000000071008
[ 35.701005] Call Trace:
[ 35.701010] [<ffffffff813eb1a3>] dump_stack+0x63/0x90
[ 35.701013] [<ffffffff81081102>] warn_slowpath_common+0x82/0xc0
[ 35.701014] [<ffffffff8108119c>] warn_slowpath_fmt+0x5c/0x80
[ 35.701026] [<ffffffffc020f376>] intel_disable_pipe+0x2b6/0x2c0 [i915]
[ 35.701038] [<ffffffffc020f72c>] ironlake_crtc_disable+0x8c/0x7c0 [i915]
[ 35.701049] [<ffffffffc020b0ec>] ? intel_crtc_disable_planes+0xdc/0xf0 [i915]
[ 35.701060] [<ffffffffc0218990>] intel_atomic_commit+0x110/0x6f0 [i915]
[ 35.701071] [<ffffffffc00687de>] ? drm_atomic_check_only+0x18e/0x590 [drm]
[ 35.701079] [<ffffffffc0067d1f>] ? drm_atomic_set_crtc_for_connector+0x6f/0xe0 [drm]
[ 35.701087] [<ffffffffc0068c17>] drm_atomic_commit+0x37/0x60 [drm]
[ 35.701092] [<ffffffffc016fb16>] drm_atomic_helper_set_config+0x76/0xb0 [drm_kms_helper]
[ 35.701099] [<ffffffffc0057e42>] drm_mode_set_config_internal+0x62/0x100 [drm]
[ 35.701106] [<ffffffffc005c362>] drm_mode_setcrtc+0x3d2/0x4f0 [drm]
[ 35.701112] [<ffffffffc004d742>] drm_ioctl+0x152/0x540 [drm]
[ 35.701119] [<ffffffffc005bf90>] ? drm_mode_setplane+0x1b0/0x1b0 [drm]
[ 35.701121] [<ffffffff81220b6f>] do_vfs_ioctl+0x29f/0x490
[ 35.701123] [<ffffffff8106b554>] ? __do_page_fault+0x1b4/0x400
[ 35.701124] [<ffffffff81220dd9>] SyS_ioctl+0x79/0x90
[ 35.701126] [<ffffffff818276b2>] entry_SYSCALL_64_fastpath+0x16/0x71
[ 35.701127] ---[ end trace c5b67dc3bdb687af ]---
[ 35.765519] [drm:ironlake_crtc_disable [i915]] *ERROR* failed to disable transcoder B
[ 35.768073] [drm:intel_set_pch_fifo_underrun_reporting [i915]] *ERROR* uncleared pch fifo underrun on pch transcoder A
[ 35.768091] [drm:intel_pch_fifo_underrun_irq_handler [i915]] *ERROR* PCH transcoder A FIFO underrun
[ 35.768114] [drm:intel_set_pch_fifo_underrun_reporting [i915]] *ERROR* uncleared pch fifo underrun on pch transcoder B
[ 35.768130] [drm:intel_pch_fifo_underrun_irq_handler [i915]] *ERROR* PCH transcoder B FIFO underrun
[ 35.855896] [drm:drm_edid_block_valid [drm]] *ERROR* EDID checksum is invalid, remainder is 212
[ 35.855897] Raw EDID:
[ 35.855898] 00 ff ff ff ff ff ff 00 22 f0 54 29 01 01 01 01
[ 35.855898] 1b 17 01 04 a5 34 20 78 23 4c a5 a7 55 4d a2 26
[ 35.855899] 10 50 54 21 08 00 d1 c0 81 c0 81 40 55 4d a2 26
[ 35.855899] a9 40 b3 00 01 01 28 3c 80 a0 70 b0 23 40 30 20
[ 35.855899] 36 00 06 44 21 00 00 1a 00 00 00 fd 00 18 3c 18
[ 35.855899] 50 11 00 0a 20 20 20 20 20 20 00 00 00 fc 00 48
[ 35.855900] 50 20 5a 52 32 34 34 30 77 0a 20 20 00 00 00 ff
[ 35.855900] 00 43 4e 34 33 32 37 30 4a 4c 5a 0a 20 20 01 a6
[ 58.088907] Raw EDID:
[ 58.088911] 00 ff ff ff 01 00 01 00 02 02 06 00 00 00 00 7b
[ 58.088912] 1b 17 01 04 a5 34 20 78 23 4c a5 a7 55 4d a2 26
[ 58.088912] 10 50 54 21 08 00 d1 c0 81 c0 81 40 81 80 95 00
[ 58.088913] a9 40 b3 00 01 01 28 3c 80 a0 70 b0 23 40 30 20
[ 58.088914] 36 00 06 44 21 00 00 1a 00 00 00 fd 00 18 3c 18
[ 58.088914] 50 11 00 0a 20 20 20 20 20 20 00 00 00 fc 00 48
[ 58.088915] 50 20 5a 52 32 34 34 30 77 0a 20 20 00 00 00 ff
[ 58.088916] 00 43 4e 34 33 32 37 30 4a 4c 5a 0a 20 20 01 a6
[ 58.091785] [drm:drm_edid_block_valid [drm]] *ERROR* EDID checksum is invalid, remainder is 203
[ 58.091786] Raw EDID:
[ 58.091786] 00 ff ff ff ff ff ff 00 22 f0 54 29 01 01 01 01
[ 58.091787] 1b 17 01 04 a5 34 20 78 23 4c 54 29 01 01 01 01
[ 58.091788] 10 50 54 21 08 00 d1 c0 81 c0 81 40 81 80 95 00
[ 58.091788] a9 40 b3 00 01 01 28 3c 80 a0 70 b0 23 40 30 20
[ 58.091789] 36 00 06 44 21 00 00 1a 00 00 00 fd 00 18 3c 18
[ 58.091790] 50 11 00 0a 20 20 20 20 20 20 00 00 00 fc 00 48
[ 58.091790] 50 20 5a 52 32 34 34 30 77 0a 20 20 00 00 00 ff
[ 58.091800] 00 43 4e 34 33 32 37 30 4a 4c 5a 0a 20 20 01 a6
[ 58.094679] [drm:drm_edid_block_valid [drm]] *ERROR* EDID checksum is invalid, remainder is 71
[ 58.094680] Raw EDID:
[ 58.094681] 00 ff ff ff ff ff ff 00 22 f0 54 29 01 01 01 01
[ 58.094681] 1b 17 01 04 a5 34 20 78 23 4c a5 a7 55 4d a2 26
[ 58.094682] 10 50 54 21 08 00 d1 c0 81 c0 81 40 81 80 95 00
[ 58.094683] a9 40 b3 00 01 01 28 3c 80 a0 70 b0 23 40 30 20
[ 58.094683] 36 00 06 44 21 00 00 1a 00 00 00 fd 23 40 30 20
[ 58.094684] 50 11 00 0a 20 20 20 20 20 20 00 00 00 fc 00 48
[ 58.094685] 50 20 5a 52 32 34 34 30 77 0a 20 20 00 00 00 ff
[ 58.094685] 00 43 4e 34 33 32 37 30 4a 4c 5a 0a 20 20 01 a6
[ 58.097544] [drm:drm_edid_block_valid [drm]] *ERROR* EDID checksum is invalid, remainder is 160
[ 58.097545] Raw EDID:
[ 58.097545] 00 ff ff ff ff ff ff 00 22 f0 54 29 01 01 01 01
[ 58.097546] 1b 17 01 04 a5 34 20 78 23 4c a5 a7 55 4d a2 26
[ 58.097547] 10 50 54 21 08 00 d1 c0 81 c0 81 40 81 80 95 00
[ 58.097547] a9 40 b3 00 01 01 28 3c 80 a0 70 b0 23 40 30 20
[ 58.097548] 36 00 06 44 21 00 00 1a 00 00 00 fd 00 18 3c 18
[ 58.097549] 50 11 00 0a 21 00 00 1a 00 00 00 fd 00 18 3c 18
[ 58.097549] 50 20 5a 52 32 34 34 30 77 0a 20 20 00 00 00 ff
[ 58.097550] 00 43 4e 34 33 32 37 30 4a 4c 5a 0a 20 20 01 a6
[ 58.097552] i915 0000:00:02.0: DP-1: EDID block 0 invalid.
一些附加信息
由于这似乎与显示有关，所以这里有一些额外的信息。
我的设置有两个显示器，一个 HP ZR2440w，另一个是较旧的戴尔显示器（我将其垂直设置）。我还注意到，在启动过程中，当登录屏幕出现时，它首先只出现在我的辅助显示器（戴尔显示器）上，并且它忽略了垂直配置（所以我必须转动头部才能真正阅读它）。几秒钟后，它将信息移动到主显示器，并修复辅助显示器的方向。
我搜索了drm:drm_edid_block_valid，但没有找到任何与启动过程本身相关的内容。发生了什么？