Comment 3 for bug 1479321

Hi Christopher,

Sometime ago, after I reported this bug, I had already updated my BIOS to 2.98:

~ $ sudo dmidecode -s bios-version && sudo dmidecode -s bios-release-date
K01 v02.98
03/18/2015

Since then I've got less video issues, but I cannot tell if they were fixed by the BIOS update or by some other update like the new kernel I have now (3.19).

Those 1-2 minutes freezes definitely have stopped or at least they are not so frequent. But sometimes my Unity still freezes for a few seconds like the first time when I press the Super key to bring up the Dash Home screen or when I run apt-get install and it starts configuring some package. I don't know if they are related. And also I am still seeing i915 crashes and errors in dmesg:

[ 10.132760] WARNING! power/level is deprecated; use power/control instead
[ 10.287641] [drm:intel_dp_complete_link_train [i915]] *ERROR* failed to update link training
[ 10.300577] [drm:intel_dp_complete_link_train [i915]] *ERROR* failed to update link training
[ 10.327787] usbcore: registered new interface driver snd-usb-audio
[ 10.449263] ------------[ cut here ]------------
[ 10.449288] WARNING: CPU: 1 PID: 207 at /build/linux-lts-vivid-3x86XO/linux-lts-vivid-3.19.0/drivers/gpu/drm/i915/intel_display.c:958 intel_disable_pipe+0x2b6/0x2c0 [i91
[ 10.449289] pipe_off wait timed out
[ 10.449290] Modules linked in: x86_pkg_temp_thermal intel_powerclamp snd_usb_audio kvm_intel snd_usbmidi_lib snd_hda_codec_hdmi hp_wmi snd_hda_codec_realtek snd_hda_code
[ 10.449312] CPU: 1 PID: 207 Comm: plymouthd Not tainted 3.19.0-28-generic #30~14.04.1-Ubuntu
[ 10.449313] Hardware name: Hewlett-Packard HP Compaq Pro 6300 MT/339A, BIOS K01 v02.98 03/18/2015
[ 10.449314] ffffffffc075f6c8 ffff8802145c3a98 ffffffff817aed97 0000000000002f5c
[ 10.449316] ffff8802145c3ae8 ffff8802145c3ad8 ffffffff81074d8a 00000000fffee53b
[ 10.449317] ffff8800d99f0000 0000000000071008 00000000fffee539 0000000000000001
[ 10.449319] Call Trace:
[ 10.449324] [<ffffffff817aed97>] dump_stack+0x45/0x57
[ 10.449326] [<ffffffff81074d8a>] warn_slowpath_common+0x8a/0xc0
[ 10.449328] [<ffffffff81074e06>] warn_slowpath_fmt+0x46/0x50
[ 10.449338] [<ffffffffc06fe126>] intel_disable_pipe+0x2b6/0x2c0 [i915]
[ 10.449348] [<ffffffffc0704d6d>] ironlake_crtc_disable+0xad/0x7c0 [i915]
[ 10.449358] [<ffffffffc0706439>] __intel_set_mode+0xa49/0xc60 [i915]
[ 10.449367] [<ffffffffc070cbb2>] intel_crtc_set_config+0x9e2/0xf60 [i915]
[ 10.449377] [<ffffffffc056783f>] drm_mode_set_config_internal+0x6f/0x110 [drm]
[ 10.449381] [<ffffffffc068a598>] restore_fbdev_mode+0xc8/0xf0 [drm_kms_helper]
[ 10.449385] [<ffffffffc068c4b9>] drm_fb_helper_restore_fbdev_mode_unlocked+0x29/0x80 [drm_kms_helper]
[ 10.449395] [<ffffffffc071a22e>] intel_fbdev_restore_mode+0x1e/0x50 [i915]
[ 10.449406] [<ffffffffc073e88e>] i915_driver_lastclose+0xe/0x20 [i915]
[ 10.449411] [<ffffffffc055ac4e>] drm_lastclose+0x2e/0x130 [drm]
[ 10.449415] [<ffffffffc055b088>] drm_release+0x338/0x540 [drm]
[ 10.449418] [<ffffffff811edf77>] __fput+0xe7/0x220
[ 10.449420] [<ffffffff811ee0fe>] ____fput+0xe/0x10
[ 10.449422] [<ffffffff81091dc7>] task_work_run+0xb7/0xf0
[ 10.449424] [<ffffffff81015007>] do_notify_resume+0x97/0xb0
[ 10.449426] [<ffffffff817b69ef>] int_signal+0x12/0x17
[ 10.449427] ---[ end trace db2aa3664cf74152 ]---
[ 10.508008] ip_tables: (C) 2000-2006 Netfilter Core Team
[ 10.517342] [drm:ironlake_crtc_disable [i915]] *ERROR* failed to disable transcoder B
[ 10.519890] [drm:intel_set_pch_fifo_underrun_reporting [i915]] *ERROR* uncleared pch fifo underrun on pch transcoder A
[ 10.519902] [drm:intel_pch_fifo_underrun_irq_handler [i915]] *ERROR* PCH transcoder A FIFO underrun
[ 10.519914] [drm:intel_set_pch_fifo_underrun_reporting [i915]] *ERROR* uncleared pch fifo underrun on pch transcoder B
[ 10.519922] [drm:intel_pch_fifo_underrun_irq_handler [i915]] *ERROR* PCH transcoder B FIFO underrun