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:
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 dp_complete_ link_train [i915]] *ERROR* failed to update link training dp_complete_ link_train [i915]] *ERROR* failed to update link training linux-lts- vivid-3x86XO/ linux-lts- vivid-3. 19.0/drivers/ gpu/drm/ i915/intel_ display. c:958 intel_disable_ pipe+0x2b6/ 0x2c0 [i91 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 d97>] dump_stack+ 0x45/0x57 d8a>] warn_slowpath_ common+ 0x8a/0xc0 e06>] warn_slowpath_ fmt+0x46/ 0x50 126>] intel_disable_ pipe+0x2b6/ 0x2c0 [i915] d6d>] ironlake_ crtc_disable+ 0xad/0x7c0 [i915] 439>] __intel_ set_mode+ 0xa49/0xc60 [i915] bb2>] intel_crtc_ set_config+ 0x9e2/0xf60 [i915] 83f>] drm_mode_ set_config_ internal+ 0x6f/0x110 [drm] 598>] restore_ fbdev_mode+ 0xc8/0xf0 [drm_kms_helper] 4b9>] drm_fb_ helper_ restore_ fbdev_mode_ unlocked+ 0x29/0x80 [drm_kms_helper] 22e>] intel_fbdev_ restore_ mode+0x1e/ 0x50 [i915] 88e>] i915_driver_ lastclose+ 0xe/0x20 [i915] c4e>] drm_lastclose+ 0x2e/0x130 [drm] 088>] drm_release+ 0x338/0x540 [drm] f77>] __fput+0xe7/0x220 0fe>] ____fput+0xe/0x10 dc7>] task_work_ run+0xb7/ 0xf0 007>] do_notify_ resume+ 0x97/0xb0 9ef>] int_signal+ 0x12/0x17 crtc_disable [i915]] *ERROR* failed to disable transcoder B set_pch_ fifo_underrun_ reporting [i915]] *ERROR* uncleared pch fifo underrun on pch transcoder A pch_fifo_ underrun_ irq_handler [i915]] *ERROR* PCH transcoder A FIFO underrun set_pch_ fifo_underrun_ reporting [i915]] *ERROR* uncleared pch fifo underrun on pch transcoder B pch_fifo_ underrun_ irq_handler [i915]] *ERROR* PCH transcoder B FIFO underrun
[ 10.287641] [drm:intel_
[ 10.300577] [drm:intel_
[ 10.327787] usbcore: registered new interface driver snd-usb-audio
[ 10.449263] ------------[ cut here ]------------
[ 10.449288] WARNING: CPU: 1 PID: 207 at /build/
[ 10.449289] pipe_off wait timed out
[ 10.449290] Modules linked in: x86_pkg_
[ 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] [<ffffffff817ae
[ 10.449326] [<ffffffff81074
[ 10.449328] [<ffffffff81074
[ 10.449338] [<ffffffffc06fe
[ 10.449348] [<ffffffffc0704
[ 10.449358] [<ffffffffc0706
[ 10.449367] [<ffffffffc070c
[ 10.449377] [<ffffffffc0567
[ 10.449381] [<ffffffffc068a
[ 10.449385] [<ffffffffc068c
[ 10.449395] [<ffffffffc071a
[ 10.449406] [<ffffffffc073e
[ 10.449411] [<ffffffffc055a
[ 10.449415] [<ffffffffc055b
[ 10.449418] [<ffffffff811ed
[ 10.449420] [<ffffffff811ee
[ 10.449422] [<ffffffff81091
[ 10.449424] [<ffffffff81015
[ 10.449426] [<ffffffff817b6
[ 10.449427] ---[ end trace db2aa3664cf74152 ]---
[ 10.508008] ip_tables: (C) 2000-2006 Netfilter Core Team
[ 10.517342] [drm:ironlake_
[ 10.519890] [drm:intel_
[ 10.519902] [drm:intel_
[ 10.519914] [drm:intel_
[ 10.519922] [drm:intel_