This is kernel 4.3.5.201602092235-1-grsec x64. I haven't seen any kind of error when the laptop has no external monitors. But with 2 external monitors connected (1 HDMI and 1 VGA) this happens. ------------[ cut here ]------------ WARNING: CPU: 0 PID: 0 at drivers/gpu/drm/i915/intel_uncore.c:620 hsw_unclaimed_reg_debug+0x82/0xa0 [i915]() Unclaimed register detected before reading register 0x22394 Modules linked in: md4 nls_utf8 cifs dns_resolver fscache ctr ccm joydev btusb btrtl btbcm btintel bluetooth iptable_raw ipt_MASQUERADE nf_nat_masquerade_ipv4 iptable_nat nf_nat_ipv4 nf_nat iptable_mangle xt_limit xt_tcpudp nf_conn snd_hda_intel snd_hda_codec e1000e snd_hda_core ptp mei_me mei shpchp snd_hwdep pps_core snd_pcm_dmaengine ac97_bus toshiba_haps toshiba_acpi rfkill sparse_keymap snd_pcm wmi dw_dmac snd_soc_sst_acpi fjes dw_dmac_core spi_pxa2xx_p drm usbcore usb_common intel_gtt i8042 serio sdhci_acpi sdhci led_class video mmc_core button CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.3.5.201602092235-1-grsec #1 Hardware name: TOSHIBA SATELLITE Z30-B/SATELLITE Z30-B, BIOS Version 3.20 04/09/2015 ffffffff00000002 cdce99a6a1ce469c 0000000000000000 ffffffffc034bdd0 ffff880221203cb0 ffffffffbb2d7360 ffff880221203cf8 ffff880221203ce8 ffffffffbb064e18 ffffffffc034bdd0 000000000000026c ffffffffc034bd98 Call Trace: <IRQ> [<ffffffffbb2d7360>] dump_stack+0x4b/0x8b [<ffffffffbb064e18>] warn_slowpath_common+0x78/0xb0 [<ffffffffbb064ebb>] warn_slowpath_fmt+0x6b/0xa0 [<ffffffffc03a4ec2>] hsw_unclaimed_reg_debug+0x82/0xa0 [i915] [<ffffffffc03a9b8d>] gen6_read32+0x4d/0x130 [i915] [<ffffffffc039aad8>] intel_lrc_irq_handler+0x108/0x270 [i915] [<ffffffffc0363c8f>] gen8_gt_irq_handler+0x20f/0x240 [i915] [<ffffffffc0363d5f>] gen8_irq_handler+0x9f/0x5e0 [i915] [<ffffffffbb0bb5ea>] handle_irq_event_percpu+0x7a/0x130 [<ffffffffbb0bb6db>] handle_irq_event+0x3b/0x60 [<ffffffffbb0be9c1>] handle_edge_irq+0xd1/0x190 [<ffffffffbb006739>] handle_irq+0x29/0x40 [<ffffffffbb005fa8>] do_IRQ+0x48/0xe0 [<ffffffffbb5ece8e>] common_interrupt+0x8e/0x8e <EOI> [<ffffffffbb45fc46>] ? cpuidle_enter_state+0x156/0x210 [<ffffffffbb45fc3f>] ? cpuidle_enter_state+0x14f/0x210 [<ffffffffbb45fd60>] cpuidle_enter+0x20/0x30 [<ffffffffbb0ab307>] call_cpuidle+0x37/0x70 [<ffffffffbb0ab4ed>] cpu_startup_entry+0x1ad/0x270 [<ffffffffbb5de594>] rest_init+0x84/0x90 [<ffffffffbbc1320a>] 0xffffffffbbc1320a [<ffffffffbbc12120>] ? 0xffffffffbbc12120 [<ffffffffbbc12328>] 0xffffffffbbc12328 [<ffffffffbbc12328>] ? 0xffffffffbbc12328 [<ffffffffbbc1241e>] 0xffffffffbbc1241e ---[ end trace d41631485b6e7ad8 ]---
Created attachment 121782 [details] dmesg Another trace with 'drm.debug=0x1e log_buf_len=1M' on the kernel command line. cat /sys/class/drm/card0/error no error state collected I also attached the dmesg log. ------------[ cut here ]------------ WARNING: CPU: 2 PID: 0 at drivers/gpu/drm/i915/intel_uncore.c:620 hsw_unclaimed_reg_debug+0x82/0xa0 [i915]() Unclaimed register detected before reading register 0x223a0 Modules linked in: ctr ccm joydev mousedev btusb btrtl btbcm btintel bluetooth iptable_raw bridge stp llc ipt_MASQUERADE nf_nat_masquerade_ipv4 iptable_nat nf_nat_ipv4 nf_nat iptable_mangle xt_limit snd_hda_codec_realtek xt_tcpudp snd_hwdep toshiba_acpi ptp mei_me memstick lpc_ich snd_pcm mei pps_core shpchp snd_timer thermal sparse_keymap toshiba_bluetooth toshiba_haps rfkill snd soundcore fjes wmi dw_dmac dw_dmac_core i2c_designware_platform snd_soc_sst_a i8042 serio sdhci_acpi sdhci led_class video mmc_core button CPU: 2 PID: 0 Comm: swapper/2 Not tainted 4.3.5.201602092235-1-grsec #1 Hardware name: TOSHIBA SATELLITE Z30-B/SATELLITE Z30-B, BIOS Version 3.20 04/09/2015 ffffffff00000002 0de1c3e764217778 0000000000000000 ffffffffc03f8dd0 ffff880221283cb0 ffffffff9e2d7360 ffff880221283cf8 ffff880221283ce8 ffffffff9e064e18 ffffffffc03f8dd0 000000000000026c ffffffffc03f8d98 Call Trace: <IRQ> [<ffffffff9e2d7360>] dump_stack+0x4b/0x8b [<ffffffff9e064e18>] warn_slowpath_common+0x78/0xb0 [<ffffffff9e064ebb>] warn_slowpath_fmt+0x6b/0xa0 [<ffffffffc0237ec2>] hsw_unclaimed_reg_debug+0x82/0xa0 [i915] [<ffffffffc023cb8d>] gen6_read32+0x4d/0x130 [i915] [<ffffffffc022da16>] intel_lrc_irq_handler+0x46/0x270 [i915] [<ffffffffc01f6c8f>] gen8_gt_irq_handler+0x20f/0x240 [i915] [<ffffffffc01f6d5f>] gen8_irq_handler+0x9f/0x5e0 [i915] [<ffffffff9e0bb5ea>] handle_irq_event_percpu+0x7a/0x130 [<ffffffff9e0dac62>] ? clockevents_program_event+0x82/0x120 [<ffffffff9e0bb6db>] handle_irq_event+0x3b/0x60 [<ffffffff9e0be9c1>] handle_edge_irq+0xd1/0x190 [<ffffffff9e006739>] handle_irq+0x29/0x40 [<ffffffff9e005fa8>] do_IRQ+0x48/0xe0 [<ffffffff9e5ece8e>] common_interrupt+0x8e/0x8e <EOI> [<ffffffff9e45fc46>] ? cpuidle_enter_state+0x156/0x210 [<ffffffff9e45fc3f>] ? cpuidle_enter_state+0x14f/0x210 [<ffffffff9e45fd60>] cpuidle_enter+0x20/0x30 [<ffffffff9e0ab307>] call_cpuidle+0x37/0x70 [<ffffffff9e0ab4ed>] cpu_startup_entry+0x1ad/0x270 [<ffffffff9e040b50>] ? lapic_get_maxlvt+0x40/0x40 [<ffffffff9e047b90>] ? flat_init_apic_ldr+0x90/0x90 [<ffffffff9e03eaf6>] start_secondary+0x1c6/0x200 ---[ end trace abb82de0cb167d64 ]---
Since 22 Feb I run kernel 4.5.0-rc5-mainline and I didn't see any more errors. I'll go ahead and close this.
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