Oh, it looks like switching to the text console also hits a WARNING, which might be relevant:
Jul 17 17:11:17 branna kernel: [ 60.360540] ------------[ cut here ]------------ Jul 17 17:11:17 branna kernel: [ 60.360572] WARNING: CPU: 2 PID: 961 at /build/linux-aqtDGz/linux-4.0.8/drivers/gpu/drm/i915/intel_display.c:1260 hsw_disable_ip s+0x49/0x190 [i915]() Jul 17 17:11:17 branna kernel: [ 60.360573] plane A assertion failure (expected on, current off) Jul 17 17:11:17 branna kernel: [ 60.360598] Modules linked in: hid_generic hid_lenovo usbhid hid uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_core v4l2 _common videodev media xt_addrtype xt_conntrack ipt_MASQUERADE nf_nat_masquerade_ipv4 iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 iptable_filter ip_t ables x_tables nf_nat nf_conntrack bridge stp llc ctr ccm dm_thin_pool dm_persistent_data dm_bio_prison dm_bufio libcrc32c loop dm_mod binfmt_misc pci_stub vboxpc i(O) vboxnetadp(O) vboxnetflt(O) vboxdrv(O) snd_hda_codec_hdmi nfsd auth_rpcgss oid_registry nfs_acl nfs lockd grace fscache sunrpc joydev nls_utf8 nls_cp437 vfat fat arc4 x86_pkg_temp_thermal intel_powerclamp intel_rapl iwlmvm iosf_mbi mac80211 coretemp iTCO_wdt iTCO_vendor_support kvm_intel kvm crct10dif_pclmul crc32_pcl mul ghash_clmulni_intel aesni_intel aes_x86_64 lrw gf128mul glue_helper efi_pstore ablk_helper cryptd iwlwifi evdev psmouse efivars rtsx_pci_ms i2c_i801 snd_hda_c odec_realtek serio_raw pcspkr sg snd_hda_codec_generic cfg80211 memstick wmi i915 thinkpad_acpi snd_hda_intel nvram snd_hda_controller rfkill snd_hda_codec ac tpm _tis snd_hwdep battery tpm snd_pcm drm_kms_helper intel_smartconnect snd_timer video snd drm soundcore mei_me mei i2c_algo_bit lpc_ich button shpchp processor par port_pc ppdev lp parport efivarfs autofs4 ext4 crc16 mbcache jbd2 md_mod sd_mod rtsx_pci_sdmmc mmc_core crc32c_intel rtsx_pci mfd_core ahci libahci ehci_pci libat a ehci_hcd xhci_pci xhci_hcd scsi_mod e1000e ptp usbcore pps_core thermal usb_common thermal_sys Jul 17 17:11:17 branna kernel: [ 60.360631] CPU: 2 PID: 961 Comm: Xorg Tainted: G O 4.0.0-2-amd64 #1 Debian 4.0.8-1 Jul 17 17:11:17 branna kernel: [ 60.360631] Hardware name: LENOVO 20ARA0H300/20ARA0H300, BIOS GJET67WW (2.17 ) 12/10/2013 Jul 17 17:11:17 branna kernel: [ 60.360634] 0000000000000000 ffffffffa05407e0 ffffffff81562ce2 ffff88030de337f8 Jul 17 17:11:17 branna kernel: [ 60.360635] ffffffff8106cf91 ffff8800d99f0000 ffff88030cfc1000 ffff88030ed9d000 Jul 17 17:11:17 branna kernel: [ 60.360637] ffff88030ed9d000 ffff88030cfc1000 ffffffff8106d00a ffffffffa05424e0 Jul 17 17:11:17 branna kernel: [ 60.360637] Call Trace: Jul 17 17:11:17 branna kernel: [ 60.360647] [<ffffffff81562ce2>] ? dump_stack+0x40/0x50 Jul 17 17:11:17 branna kernel: [ 60.360649] [<ffffffff8106cf91>] ? warn_slowpath_common+0x81/0xb0 Jul 17 17:11:17 branna kernel: [ 60.360651] [<ffffffff8106d00a>] ? warn_slowpath_fmt+0x4a/0x50 Jul 17 17:11:17 branna kernel: [ 60.360668] [<ffffffffa04e10b9>] ? hsw_disable_ips+0x49/0x190 [i915] Jul 17 17:11:17 branna kernel: [ 60.360677] [<ffffffffa04e1473>] ? intel_crtc_disable_planes+0x43/0x130 [i915] Jul 17 17:11:17 branna kernel: [ 60.360684] [<ffffffffa04e220f>] ? haswell_crtc_disable+0x4f/0x3a0 [i915] Jul 17 17:11:17 branna kernel: [ 60.360692] [<ffffffffa04e307c>] ? __intel_set_mode+0x97c/0xb40 [i915] Jul 17 17:11:17 branna kernel: [ 60.360700] [<ffffffffa04ea0e4>] ? intel_crtc_set_config+0xc04/0xfc0 [i915] Jul 17 17:11:17 branna kernel: [ 60.360706] [<ffffffffa03cc175>] ? drm_atomic_helper_plane_set_property+0x85/0xd0 [drm_kms_helper] Jul 17 17:11:17 branna kernel: [ 60.360714] [<ffffffffa033e267>] ? drm_mode_set_config_internal+0x67/0x100 [drm] Jul 17 17:11:17 branna kernel: [ 60.360719] [<ffffffffa03cde61>] ? restore_fbdev_mode+0xc1/0xe0 [drm_kms_helper] Jul 17 17:11:17 branna kernel: [ 60.360723] [<ffffffffa03cfd80>] ? drm_fb_helper_restore_fbdev_mode_unlocked+0x20/0x60 [drm_kms_helper] Jul 17 17:11:17 branna kernel: [ 60.360727] [<ffffffffa03cfde2>] ? drm_fb_helper_set_par+0x22/0x50 [drm_kms_helper] Jul 17 17:11:17 branna kernel: [ 60.360734] [<ffffffffa04f8b96>] ? intel_fbdev_set_par+0x16/0x60 [i915] Jul 17 17:11:17 branna kernel: [ 60.360736] [<ffffffff811d6add>] ? do_sys_poll+0x10d/0x540 Jul 17 17:11:17 branna kernel: [ 60.360739] [<ffffffff8133f51e>] ? fb_set_var+0x15e/0x3a0 Jul 17 17:11:17 branna kernel: [ 60.360740] [<ffffffff81336543>] ? fbcon_blank+0x223/0x2e0 Jul 17 17:11:17 branna kernel: [ 60.360743] [<ffffffff813b0317>] ? do_unblank_screen+0xb7/0x1f0 Jul 17 17:11:17 branna kernel: [ 60.360744] [<ffffffff813a62c4>] ? complete_change_console+0x54/0xe0 Jul 17 17:11:17 branna kernel: [ 60.360745] [<ffffffff813a741f>] ? vt_ioctl+0x10cf/0x1390 Jul 17 17:11:17 branna kernel: [ 60.360752] [<ffffffffa03336ea>] ? drm_ioctl+0x8a/0x5a0 [drm] Jul 17 17:11:17 branna kernel: [ 60.360754] [<ffffffff8139990e>] ? tty_ioctl+0x3de/0xc50 Jul 17 17:11:17 branna kernel: [ 60.360756] [<ffffffff811d4db8>] ? do_vfs_ioctl+0x2e8/0x4f0 Jul 17 17:11:17 branna kernel: [ 60.360758] [<ffffffff8105cd89>] ? __do_page_fault+0x1d9/0x490 Jul 17 17:11:17 branna kernel: [ 60.360759] [<ffffffff811d5041>] ? SyS_ioctl+0x81/0xa0 Jul 17 17:11:17 branna kernel: [ 60.360772] [<ffffffff8156b048>] ? page_fault+0x28/0x30 Jul 17 17:11:17 branna kernel: [ 60.360773] [<ffffffff81568e8d>] ? system_call_fast_compare_end+0xc/0x11 Jul 17 17:11:17 branna kernel: [ 60.360774] ---[ end trace be9ec39b03bd894b ]--- On Fri, Jul 17, 2015 at 6:20 PM, Nathaniel J. Smith <n...@pobox.com> wrote: > Source: linux > Version: 4.0.8-1 > Severity: important > > On my thinkpad T440s (Intel graphics), I often use an external (HDMI) monitor > via a docking station. With the 3.16.7-ckt11 version of the kernel, this works > great. With 4.0.8-1 (current in testing), it doesn't work at all -- it detects > that the monitor is there, Xorg.0.log says: > > [ 103.360] (II) intel(0): switch to mode 3440x1440@60.0 on DP2-1 using pipe > 1, position (1920, 0), rotation normal, reflection none > [ 104.092] (II) intel(0): switch to mode 1920x1080@60.0 on eDP1 using pipe > 0, > position (0, 0), rotation normal, reflection none > > but then the kernel log says: > > Jul 17 17:10:21 branna kernel: [ 13.488687] > [drm:intel_set_cpu_fifo_underrun_reporting [i915]] *ERROR* uncleared fifo > underrun on pipe A > Jul 17 17:10:21 branna kernel: [ 13.488707] [drm:ironlake_irq_handler > [i915]] > *ERROR* CPU pipe A FIFO underrun > > and the external monitor stays resolutely blank. The gnome display settings > tool thinks that it's active, and that it can be configured; each time I try > reconfiguring it I get the fifo underrun error again. But at no point does the > external monitor leave power-saving mode. > > Curiously, if I switch to a text console (ctrl-alt-f1), then the text console > *does* appear on both the built-in and external displays. > > The cause is definitely the kernel, because if I reboot and select the older > kernel from the grub menu, while keeping everything else the same, then it > works perfectly again. > > > > -- System Information: > Debian Release: stretch/sid > APT prefers testing > APT policy: (900, 'testing'), (500, 'unstable') > Architecture: amd64 (x86_64) > Foreign Architectures: i386 > > Kernel: Linux 3.16.0-4-amd64 (SMP w/4 CPU cores) > Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8) > Shell: /bin/sh linked to /bin/dash > Init: systemd (via /run/systemd/system) -- Nathaniel J. Smith -- http://vorpus.org -- To UNSUBSCRIBE, email to debian-kernel-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org Archive: https://lists.debian.org/CAPJVwBkC6ys787RFzqM3=LHcovf73dkms-=y9ghs0pfv2eb...@mail.gmail.com
