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Message #175342
[Bug 1567417] Re: WARN_ON(!wm_changed) skl_update_other_pipe_wm+0x16c/0x180 [i915_bpo]
Happened on 4.2.0-35-generic #40-Ubuntu SMP x86_64 x86_64 x86_64
GNU/Linux
Apr 29 11:49:47 MyLap thermald[690]: Set : threshold:90000, temperature:90000, cdev:9(rapl_controller), curr_state:500000, max_state:15000000
Apr 29 11:49:49 MyLap kernel: [ 108.430293] ------------[ cut here ]------------
Apr 29 11:49:49 MyLap kernel: [ 108.430317] WARNING: CPU: 0 PID: 814 at /build/linux-HVWSXI/linux-4.2.0/drivers/gpu/drm/i915/intel_pm.c:3404 skl_update_other_ipe_wm+0x1de/0x1f0 [i915]()
Apr 29 11:49:49 MyLap kernel: [ 108.430319] WARN_ON(!wm_changed)
Apr 29 11:49:49 MyLap kernel: [ 108.430321] Modules linked in: drbg ansi_cprng ctr ccm rfcomm bnep binfmt_misc snd_hda_codec_hdmi snd_hda_codec_realtek snd_hda_codec_generic btusb btrtl uvcvideo btbcm videobuf2_vmalloc btintel videobuf2_memops videobuf2_core hid_multitouch bluetooth v4l2_common videodev joydev media arc4 i2c_designware_platform i2c_designware_core asus_nb_wmi asus_wmi sparse_keymap intel_rapl nls_iso8859_1 snd_hda_intel x86_pkg_temp_thermal intel_powerclamp snd_hda_codec coretemp snd_hda_core kvm_intel snd_hwdep snd_pcm kvm snd_seq_midi snd_seq_midi_event snd_rawmidi crct10dif_pclmul crc32_pclmul iwlmvm aesni_intel snd_seq mac80211 aes_x86_64 snd_seq_device lrw gf128mul snd_timer glue_helper ablk_helper cryptd snd iwlwifi input_leds serio_raw soundcore cfg80211 mei_me idma64 virt_dma mei intel_lpss_pci processor_thermal_device intel_soc_dts_iosf shpchp int3403_thermal intel_lpss_acpi intel_lpss int3402_thermal int340x_thermal_zone int3400_thermal tpm_crb acpi_thermal_rel acpi_pad mac_hid parport_pc ppdev lp parport autofs4 hid_generic usbhid psmouse nouveau i915 mxm_wmi ttm i2c_algo_bit nvme drm_kms_helper ahci drm libahci i2c_hid hid wmi pinctrl_sunrisepoint video pinctrl_intel
Apr 29 11:49:49 MyLap kernel: [ 108.430374] CPU: 0 PID: 814 Comm: Xorg Tainted: G W 4.2.0-35-generic #40-Ubuntu
Apr 29 11:49:49 MyLap kernel: [ 108.430376] Hardware name: ASUSTeK COMPUTER INC. N501VW/N501VW, BIOS N501VW.203 10/28/2015
Apr 29 11:49:49 MyLap kernel: [ 108.430378] 0000000000000286 000000003c0c4883 ffff8804a9173518 ffffffff817f1d7e
Apr 29 11:49:49 MyLap kernel: [ 108.430380] ffff8804a9173570 ffffffffc0230680 ffff8804a9173558 ffffffff8107cb46
Apr 29 11:49:49 MyLap kernel: [ 108.430382] ffff8804a9173620 ffff8804a91736c4 ffff8804b0f9b000 ffff8804b0f9a000
Apr 29 11:49:49 MyLap kernel: [ 108.430384] Call Trace:
Apr 29 11:49:49 MyLap kernel: [ 108.430392] [<ffffffff817f1d7e>] dump_stack+0x63/0x81
Apr 29 11:49:49 MyLap kernel: [ 108.430396] [<ffffffff8107cb46>] warn_slowpath_common+0x86/0xc0
Apr 29 11:49:49 MyLap kernel: [ 108.430398] [<ffffffff8107cbd5>] warn_slowpath_fmt+0x55/0x70
Apr 29 11:49:49 MyLap kernel: [ 108.430417] [<ffffffffc016fbae>] skl_update_other_pipe_wm+0x1de/0x1f0 [i915]
Apr 29 11:49:49 MyLap kernel: [ 108.430430] [<ffffffffc016fd7b>] skl_update_wm+0x1bb/0x740 [i915]
Apr 29 11:49:49 MyLap kernel: [ 108.430434] [<ffffffff813d3b54>] ? timerqueue_del+0x24/0x70
Apr 29 11:49:49 MyLap kernel: [ 108.430437] [<ffffffff810ea07c>] ? __remove_hrtimer+0x3c/0x90
Apr 29 11:49:49 MyLap kernel: [ 108.430439] [<ffffffff810ea1a1>] ? hrtimer_try_to_cancel+0xd1/0x130
Apr 29 11:49:49 MyLap kernel: [ 108.430452] [<ffffffffc01734ce>] intel_update_watermarks+0x1e/0x30 [i915]
Apr 29 11:49:49 MyLap kernel: [ 108.430471] [<ffffffffc01d7989>] intel_finish_crtc_commit+0x169/0x190 [i915]
Apr 29 11:49:49 MyLap kernel: [ 108.430478] [<ffffffffc0106d43>] drm_atomic_helper_commit_planes_on_crtc+0x143/0x260 [drm_kms_helper]
Apr 29 11:49:49 MyLap kernel: [ 108.430496] [<ffffffffc01f0e9b>] intel_atomic_commit+0x6b/0x100 [i915]
Apr 29 11:49:49 MyLap kernel: [ 108.430531] [<ffffffffc00c3e17>] drm_atomic_commit+0x37/0x60 [drm]
Apr 29 11:49:49 MyLap kernel: [ 108.430536] [<ffffffffc010567f>] drm_atomic_helper_disable_plane+0xef/0x130 [drm_kms_helper]
Apr 29 11:49:49 MyLap kernel: [ 108.430539] [<ffffffff816d6efb>] ? skb_release_data+0xab/0xe0
Apr 29 11:49:49 MyLap kernel: [ 108.430551] [<ffffffffc00b3a0a>] __setplane_internal+0x23a/0x2f0 [drm]
Apr 29 11:49:49 MyLap kernel: [ 108.430561] [<ffffffffc00b3beb>] drm_mode_cursor_universal+0x12b/0x210 [drm]
Apr 29 11:49:49 MyLap kernel: [ 108.430563] [<ffffffff817f695f>] ? __ww_mutex_lock+0x5f/0xa0
Apr 29 11:49:49 MyLap kernel: [ 108.430572] [<ffffffffc00b3d51>] drm_mode_cursor_common+0x81/0x180 [drm]
Apr 29 11:49:49 MyLap kernel: [ 108.430583] [<ffffffffc00b7d70>] drm_mode_cursor_ioctl+0x50/0x70 [drm]
Apr 29 11:49:49 MyLap kernel: [ 108.430592] [<ffffffffc00a8505>] drm_ioctl+0x125/0x610 [drm]
Apr 29 11:49:49 MyLap kernel: [ 108.430601] [<ffffffffc00b7d20>] ? drm_mode_setcrtc+0x500/0x500 [drm]
Apr 29 11:49:49 MyLap kernel: [ 108.430604] [<ffffffff813d3ab9>] ? timerqueue_add+0x59/0xb0
Apr 29 11:49:49 MyLap kernel: [ 108.430607] [<ffffffff810e9c41>] ? enqueue_hrtimer+0x41/0x90
Apr 29 11:49:49 MyLap kernel: [ 108.430609] [<ffffffff810ea79d>] ? hrtimer_start_range_ns+0x1cd/0x3d0
Apr 29 11:49:49 MyLap kernel: [ 108.430612] [<ffffffff81213cd5>] do_vfs_ioctl+0x295/0x480
Apr 29 11:49:49 MyLap kernel: [ 108.430614] [<ffffffff81089951>] ? __set_task_blocked+0x41/0xa0
Apr 29 11:49:49 MyLap kernel: [ 108.430616] [<ffffffff81213f39>] SyS_ioctl+0x79/0x90
Apr 29 11:49:49 MyLap kernel: [ 108.430619] [<ffffffff8108c65e>] ? SyS_rt_sigprocmask+0x8e/0xc0
Apr 29 11:49:49 MyLap kernel: [ 108.430622] [<ffffffff817f8c72>] entry_SYSCALL_64_fastpath+0x16/0x75
Apr 29 11:49:49 MyLap kernel: [ 108.430640] ---[ end trace 97f587eacf425791 ]---
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https://bugs.launchpad.net/bugs/1567417
Title:
WARN_ON(!wm_changed) skl_update_other_pipe_wm+0x16c/0x180 [i915_bpo]
Status in linux package in Ubuntu:
Confirmed
Bug description:
Hi,
I'm using a new Skylake Thinkpad T460s with and external monitor
connected via Displayport and Ubuntu 16.04 and the latest kernel as of
today: Linux test 4.4.0-17-generic #33-Ubuntu SMP Tue Mar 29 17:17:28
UTC 2016 x86_64 x86_64 x86_64 GNU/Linux
X will from time to time lock up when the computer is left idle for a
long time and both displays (laptop and external) go to sleep and then
woken up.
Apr 7 08:00:49 test kernel: [ 9.950929] ------------[ cut here ]------------
Apr 7 08:00:49 test kernel: [ 9.950950] WARNING: CPU: 0 PID: 214 at /build/linux-YiIlnA/linux-4.4.0/ubuntu/i915/intel_pm.c:3572 skl_update_other_pipe_wm+0x16c/0x180 [i915_bpo]()
Apr 7 08:00:49 test kernel: [ 9.950951] WARN_ON(!wm_changed)
Apr 7 08:00:49 test kernel: [ 9.950972] Modules linked in: btusb btrtl btbcm btintel bluetooth binfmt_misc nls_iso8859_1 arc4 snd_hda_codec_hdmi snd_hda_codec_realtek snd_hda_codec_generic snd_soc_skl snd_soc_skl_ipc snd_hda_ext_core snd_soc_sst_ipc snd_soc_sst_dsp snd_soc_core snd_compress ac97_bus snd_pcm_dmaengine dw_dmac_core snd_hda_intel snd_hda_codec snd_hda_core snd_hwdep snd_pcm thinkpad_acpi intel_rapl x86_pkg_temp_thermal nvram intel_powerclamp snd_seq_midi coretemp snd_seq_midi_event snd_rawmidi iwlmvm snd_seq joydev snd_seq_device input_leds mac80211 snd_timer serio_raw snd rtsx_pci_ms memstick soundcore iwlwifi cfg80211 mei_me mei tpm_crb mac_hid shpchp kvm_intel kvm irqbypass parport_pc ppdev lp parport autofs4 drbg ansi_cprng algif_skcipher af_alg hid_microsoft dm_crypt hid_generic usbhid hid rtsx_pci_sdmmc crct10dif_pclmul crc32_pclmul i915_bpo aesni_intel aes_x86_64 lrw gf128mul glue_helper ablk_helper cryptd intel_ips i2c_algo_bit drm_kms_helper e1000e syscopyarea sysfillrect psmouse sysimgblt ptp fb_sys_fops pps_core drm nvme rtsx_pci wmi video fjes
Apr 7 08:00:49 test kernel: [ 9.950980] CPU: 0 PID: 214 Comm: plymouthd Not tainted 4.4.0-17-generic #33-Ubuntu
Apr 7 08:00:49 test kernel: [ 9.950981] Hardware name: LENOVO 20F9CTO1WW/20F9CTO1WW, BIOS N1CET40W (1.08 ) 03/09/2016
Apr 7 08:00:49 test kernel: [ 9.950982] 0000000000000286 0000000039cb6999 ffff880502bc3618 ffffffff813e8123
Apr 7 08:00:49 test kernel: [ 9.950983] ffff880502bc3660 ffffffffc0343c70 ffff880502bc3650 ffffffff8107fe12
Apr 7 08:00:49 test kernel: [ 9.950984] ffff880502da8000 ffff880501f79d9c ffff880502dab000 ffff880508186b78
Apr 7 08:00:49 test kernel: [ 9.950984] Call Trace:
Apr 7 08:00:49 test kernel: [ 9.950988] [<ffffffff813e8123>] dump_stack+0x63/0x90
Apr 7 08:00:49 test kernel: [ 9.950990] [<ffffffff8107fe12>] warn_slowpath_common+0x82/0xc0
Apr 7 08:00:49 test kernel: [ 9.950991] [<ffffffff8107feac>] warn_slowpath_fmt+0x5c/0x80
Apr 7 08:00:49 test kernel: [ 9.951002] [<ffffffffc02755cc>] skl_update_other_pipe_wm+0x16c/0x180 [i915_bpo]
Apr 7 08:00:49 test kernel: [ 9.951010] [<ffffffffc0275766>] skl_update_wm+0x186/0x5f0 [i915_bpo]
Apr 7 08:00:49 test kernel: [ 9.951023] [<ffffffffc03013af>] ? intel_ddi_enable_transcoder_func+0x17f/0x260 [i915_bpo]
Apr 7 08:00:49 test kernel: [ 9.951034] [<ffffffffc027948e>] intel_update_watermarks+0x1e/0x30 [i915_bpo]
Apr 7 08:00:49 test kernel: [ 9.951048] [<ffffffffc02e5441>] haswell_crtc_enable+0x321/0x8c0 [i915_bpo]
Apr 7 08:00:49 test kernel: [ 9.951061] [<ffffffffc02d1ace>] ? intel_finish_crtc_commit+0xe/0x10 [i915_bpo]
Apr 7 08:00:49 test kernel: [ 9.951072] [<ffffffffc017b324>] ? drm_atomic_helper_commit_planes_on_crtc+0x154/0x270 [drm_kms_helper]
Apr 7 08:00:49 test kernel: [ 9.951085] [<ffffffffc02e1ded>] intel_atomic_commit+0x5dd/0xdb0 [i915_bpo]
Apr 7 08:00:49 test kernel: [ 9.951101] [<ffffffffc007180e>] ? drm_atomic_check_only+0x18e/0x590 [drm]
Apr 7 08:00:49 test kernel: [ 9.951109] [<ffffffffc0071c47>] drm_atomic_commit+0x37/0x60 [drm]
Apr 7 08:00:49 test kernel: [ 9.951113] [<ffffffffc017c5ef>] restore_fbdev_mode+0x22f/0x260 [drm_kms_helper]
Apr 7 08:00:49 test kernel: [ 9.951121] [<ffffffffc007046a>] ? drm_modeset_lock_all_ctx+0x9a/0xb0 [drm]
Apr 7 08:00:49 test kernel: [ 9.951125] [<ffffffffc017e7d3>] drm_fb_helper_restore_fbdev_mode_unlocked+0x33/0x80 [drm_kms_helper]
Apr 7 08:00:49 test kernel: [ 9.951128] [<ffffffffc017e84d>] drm_fb_helper_set_par+0x2d/0x50 [drm_kms_helper]
Apr 7 08:00:49 test kernel: [ 9.951131] [<ffffffffc017e752>] drm_fb_helper_hotplug_event+0xd2/0x120 [drm_kms_helper]
Apr 7 08:00:49 test kernel: [ 9.951134] [<ffffffffc017e7f6>] drm_fb_helper_restore_fbdev_mode_unlocked+0x56/0x80 [drm_kms_helper]
Apr 7 08:00:49 test kernel: [ 9.951136] [<ffffffffc017e84d>] drm_fb_helper_set_par+0x2d/0x50 [drm_kms_helper]
Apr 7 08:00:49 test kernel: [ 9.951150] [<ffffffffc02f79aa>] intel_fbdev_set_par+0x1a/0x60 [i915_bpo]
Apr 7 08:00:49 test kernel: [ 9.951151] [<ffffffff8146b2b6>] fb_set_var+0x236/0x460
Apr 7 08:00:49 test kernel: [ 9.951153] [<ffffffff810b217d>] ? select_idle_sibling+0xbd/0x120
Apr 7 08:00:49 test kernel: [ 9.951155] [<ffffffff810b3441>] ? wakeup_preempt_entity.isra.55+0x41/0x50
Apr 7 08:00:49 test kernel: [ 9.951156] [<ffffffff810b3e8a>] ? check_preempt_wakeup+0xfa/0x220
Apr 7 08:00:49 test kernel: [ 9.951158] [<ffffffff814615af>] fbcon_blank+0x30f/0x350
Apr 7 08:00:49 test kernel: [ 9.951160] [<ffffffff814f85c3>] do_unblank_screen+0xd3/0x1a0
Apr 7 08:00:49 test kernel: [ 9.951161] [<ffffffff814edc4a>] vt_ioctl+0x50a/0x12f0
Apr 7 08:00:49 test kernel: [ 9.951167] [<ffffffffc0056749>] ? drm_ioctl+0x189/0x540 [drm]
Apr 7 08:00:49 test kernel: [ 9.951168] [<ffffffff814e117f>] tty_ioctl+0x35f/0xc40
Apr 7 08:00:49 test kernel: [ 9.951170] [<ffffffff81821f79>] ? schedule_hrtimeout_range_clock+0xb9/0x1b0
Apr 7 08:00:49 test kernel: [ 9.951172] [<ffffffff812544eb>] ? ep_poll+0x37b/0x3d0
Apr 7 08:00:49 test kernel: [ 9.951173] [<ffffffff8121ef3f>] do_vfs_ioctl+0x29f/0x490
Apr 7 08:00:49 test kernel: [ 9.951175] [<ffffffff810aaca0>] ? wake_up_q+0x70/0x70
Apr 7 08:00:49 test kernel: [ 9.951176] [<ffffffff8121f1a9>] SyS_ioctl+0x79/0x90
Apr 7 08:00:49 test kernel: [ 9.951177] [<ffffffff81822b72>] entry_SYSCALL_64_fastpath+0x16/0x71
Apr 7 08:00:49 test kernel: [ 9.951178] ---[ end trace 7e448a85359a7dca ]---
Attached is the full kernel log from boot until the issue happens, at which point, if I have a lockup of X I need to reboot to get back to normal.
I don't know if this particular bug I'm reporting is the one
responsible for the lockups, as I've isolated 4 different
warning/error messages which separately or in combination may be the
cause. I'm reporting all of them now in separate bug reports.
Please let me know if any information is missing.
# lspci
00:00.0 Host bridge: Intel Corporation Sky Lake Host Bridge/DRAM Registers (rev 08)
00:02.0 VGA compatible controller: Intel Corporation Sky Lake Integrated Graphics (rev 07)
00:08.0 System peripheral: Intel Corporation Sky Lake Gaussian Mixture Model
00:14.0 USB controller: Intel Corporation Sunrise Point-LP USB 3.0 xHCI Controller (rev 21)
00:14.2 Signal processing controller: Intel Corporation Sunrise Point-LP Thermal subsystem (rev 21)
00:16.0 Communication controller: Intel Corporation Sunrise Point-LP CSME HECI (rev 21)
00:1c.0 PCI bridge: Intel Corporation Device 9d10 (rev f1)
00:1c.2 PCI bridge: Intel Corporation Device 9d12 (rev f1)
00:1c.4 PCI bridge: Intel Corporation Sunrise Point-LP PCI Express Root Port (rev f1)
00:1f.0 ISA bridge: Intel Corporation Sunrise Point-LP LPC Controller (rev 21)
00:1f.2 Memory controller: Intel Corporation Sunrise Point-LP PMC (rev 21)
00:1f.3 Audio device: Intel Corporation Sunrise Point-LP HD Audio (rev 21)
00:1f.4 SMBus: Intel Corporation Sunrise Point-LP SMBus (rev 21)
00:1f.6 Ethernet controller: Intel Corporation Ethernet Connection I219-LM (rev 21)
02:00.0 Unassigned class [ff00]: Realtek Semiconductor Co., Ltd. RTS522A PCI Express Card Reader (rev 01)
04:00.0 Network controller: Intel Corporation Wireless 8260 (rev 3a)
05:00.0 Non-Volatile memory controller: Samsung Electronics Co Ltd NVMe SSD Controller (rev 01)
# lspci -vvv
00:00.0 Host bridge: Intel Corporation Sky Lake Host Bridge/DRAM Registers (rev 08)
Subsystem: Lenovo Skylake Host Bridge/DRAM Registers
Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort+ >SERR- <PERR- INTx-
Latency: 0
Capabilities: [e0] Vendor Specific Information: Len=10 <?>
00:02.0 VGA compatible controller: Intel Corporation Sky Lake Integrated Graphics (rev 07) (prog-if 00 [VGA controller])
Subsystem: Lenovo Skylake Integrated Graphics
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+
Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
Latency: 0
Interrupt: pin A routed to IRQ 133
Region 0: Memory at f0000000 (64-bit, non-prefetchable) [size=16M]
Region 2: Memory at e0000000 (64-bit, prefetchable) [size=256M]
Region 4: I/O ports at e000 [size=64]
Expansion ROM at <unassigned> [disabled]
Capabilities: [40] Vendor Specific Information: Len=0c <?>
Capabilities: [70] Express (v2) Root Complex Integrated Endpoint, MSI 00
DevCap: MaxPayload 128 bytes, PhantFunc 0
ExtTag- RBE+
DevCtl: Report errors: Correctable- Non-Fatal- Fatal- Unsupported-
RlxdOrd- ExtTag- PhantFunc- AuxPwr- NoSnoop-
MaxPayload 128 bytes, MaxReadReq 128 bytes
DevSta: CorrErr- UncorrErr- FatalErr- UnsuppReq- AuxPwr- TransPend-
DevCap2: Completion Timeout: Not Supported, TimeoutDis-, LTR-, OBFF Not Supported
DevCtl2: Completion Timeout: 50us to 50ms, TimeoutDis-, LTR-, OBFF Disabled
Capabilities: [ac] MSI: Enable+ Count=1/1 Maskable- 64bit-
Address: fee00018 Data: 0000
Capabilities: [d0] Power Management version 2
Flags: PMEClk- DSI+ D1- D2- AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-)
Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-
Capabilities: [100 v1] #1b
Capabilities: [200 v1] Address Translation Service (ATS)
ATSCap: Invalidate Queue Depth: 00
ATSCtl: Enable-, Smallest Translation Unit: 00
Capabilities: [300 v1] #13
Kernel driver in use: i915_bpo
Kernel modules: i915_bpo
# for file in /sys/module/i915_bpo/parameters/*; do echo -en $file"\t"; cat $file; done;
/sys/module/i915_bpo/parameters/disable_display N
/sys/module/i915_bpo/parameters/disable_power_well 1
/sys/module/i915_bpo/parameters/edp_vswing 0
/sys/module/i915_bpo/parameters/enable_cmd_parser 1
/sys/module/i915_bpo/parameters/enable_dc -1
/sys/module/i915_bpo/parameters/enable_execlists 1
/sys/module/i915_bpo/parameters/enable_fbc -1
/sys/module/i915_bpo/parameters/enable_guc_submission N
/sys/module/i915_bpo/parameters/enable_hangcheck Y
/sys/module/i915_bpo/parameters/enable_ips 1
/sys/module/i915_bpo/parameters/enable_ppgtt 3
/sys/module/i915_bpo/parameters/enable_psr 0
/sys/module/i915_bpo/parameters/enable_rc6 1
/sys/module/i915_bpo/parameters/fastboot N
/sys/module/i915_bpo/parameters/guc_log_level -1
/sys/module/i915_bpo/parameters/invert_brightness 0
/sys/module/i915_bpo/parameters/load_detect_test N
/sys/module/i915_bpo/parameters/lvds_channel_mode 0
/sys/module/i915_bpo/parameters/lvds_use_ssc -1
/sys/module/i915_bpo/parameters/mmio_debug 0
/sys/module/i915_bpo/parameters/modeset -1
/sys/module/i915_bpo/parameters/nuclear_pageflip N
/sys/module/i915_bpo/parameters/panel_ignore_lid 1
/sys/module/i915_bpo/parameters/prefault_disable N
/sys/module/i915_bpo/parameters/preliminary_hw_support 0
/sys/module/i915_bpo/parameters/reset Y
/sys/module/i915_bpo/parameters/semaphores -1
/sys/module/i915_bpo/parameters/use_mmio_flip 0
/sys/module/i915_bpo/parameters/vbt_sdvo_panel_type -1
/sys/module/i915_bpo/parameters/verbose_state_checks Y
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References
