Hallo everybody, after upgrading from a kernel 5.0 to 5.2, i run into a reproducible regression with a display-port monitor on a Quadro M1000M. I got the following kernel message : [ 161.070503] nouveau 0000:01:00.0: 126.016 Gb/s available PCIe bandwidth, limited by 8 GT/s x16 link at 0000:00:01.0 (capable of 992.439 Gb/s with 16 GT/s x63 link) [ 162.449210] WARNING: CPU: 5 PID: 1497 at drivers/gpu/drm/drm_dp_mst_topology.c:3209 drm_dp_atomic_release_vcpi_slots+0x43/0xa0 [drm_kms_helper] [ 162.449211] Modules linked in: bnep cpufreq_conservative cpufreq_userspace cpufreq_powersave msr binfmt_misc nls_ascii nls_cp437 vfat fat joydev arc4 uvcvideo btusb btrtl btbcm videobuf2_vmalloc btintel mei_hdcp videobuf2_memops videobuf2_v4l2 videobuf2_common bluetooth videodev media ecdh_generic ecc intel_rapl iwlmvm x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel mac80211 kvm irqbypass snd_hda_codec_realtek intel_cstate snd_hda_codec_generic iwlwifi intel_uncore deflate intel_rapl_perf efi_pstore snd_hda_intel pcspkr snd_hda_codec efivars snd_hwdep snd_hda_core snd_pcm rmi_smbus iTCO_wdt rmi_core snd_timer iTCO_vendor_support cfg80211 sg mei_me nvidiafb mei vgastate fb_ddc thinkpad_acpi intel_pch_thermal nvram snd tpm_crb soundcore tpm_tis rfkill ac battery tpm_tis_core tpm rng_core pcc_cpufreq loop sunrpc ecryptfs efivarfs ip_tables x_tables autofs4 btrfs algif_skcipher af_alg mmc_block hid_generic usbhid hid lrw fuse fan dm_raid raid456 async_raid6_recov async_memcpy async_pq [ 162.449241] async_xor async_tx xor raid6_pq libcrc32c md_mod dm_snapshot dm_bufio dm_crypt dm_mirror dm_region_hash dm_log dm_mod crct10dif_pclmul crc32_pclmul crc32c_intel ghash_clmulni_intel nouveau i915 rtsx_pci_sdmmc mmc_core mxm_wmi ttm i2c_algo_bit xhci_pci xhci_hcd aesni_intel drm_kms_helper e1000e aes_x86_64 psmouse crypto_simd ptp serio_raw cryptd glue_helper pps_core rtsx_pci drm usbcore i2c_i801 mfd_core sd_mod evdev thermal wmi video button [ 162.449259] CPU: 5 PID: 1497 Comm: Xorg Tainted: G T 5.2.0-thinkpad #1 [ 162.449261] Hardware name: LENOVO 20EQS3V200/20EQS3V200, BIOS N1EET82W (1.55 ) 12/18/2018 [ 162.449268] RIP: 0010:drm_dp_atomic_release_vcpi_slots+0x43/0xa0 [drm_kms_helper] [ 162.449270] Code: 50 08 48 8d 70 08 48 8d 5a f0 48 39 d6 74 1b 48 3b 6a f0 75 08 eb 2f 48 39 69 f0 74 29 48 8b 4b 10 48 8d 59 f0 48 39 ce 75 ed <0f> 0b 48 c7 c7 00 4e 5c c0 48 89 c2 48 89 ee e8 09 76 db ff b8 ea [ 162.449271] RSP: 0018:ffffa68d435cfa68 EFLAGS: 00010246 [ 162.449272] RAX: ffff97bdba93c1a0 RBX: ffff97bdba93c198 RCX: ffff97bdba93c1a0 [ 162.449273] RDX: ffff97bdba93c1a8 RSI: ffff97bdba93c1a8 RDI: 0000000000000010 [ 162.449274] RBP: ffff97bdcae43000 R08: ffff97bdcb905600 R09: ffff97bdcbfc7200 [ 162.449275] R10: ffffa68d435cfa20 R11: ffff97bdcbfc7200 R12: 0000000000000004 [ 162.449276] R13: ffff97bdb4025a80 R14: 0000000000000003 R15: ffff97bdb7f92010 [ 162.449277] FS: 00007f57bcf45200(0000) GS:ffff97bdcf540000(0000) knlGS:0000000000000000 [ 162.449278] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 162.449280] CR2: 000055f5b0838a90 CR3: 0000000475bf6002 CR4: 00000000003606e0 [ 162.449281] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 162.449281] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 162.449282] Call Trace: [ 162.449293] drm_atomic_helper_check_modeset+0x391/0xa80 [drm_kms_helper] [ 162.449301] drm_atomic_helper_check+0x14/0x90 [drm_kms_helper] [ 162.449352] nv50_disp_atomic_check+0x83/0x1d0 [nouveau] [ 162.449371] drm_atomic_check_only+0x5b3/0x870 [drm] [ 162.449387] drm_atomic_commit+0x13/0x50 [drm] [ 162.449395] drm_atomic_helper_set_config+0x77/0x80 [drm_kms_helper] [ 162.449411] drm_mode_setcrtc+0x548/0x740 [drm] [ 162.449425] ? drm_mode_getcrtc+0x180/0x180 [drm] [ 162.449435] drm_ioctl_kernel+0xbb/0x100 [drm] [ 162.449446] drm_ioctl+0x2e2/0x380 [drm] [ 162.449457] ? drm_mode_getcrtc+0x180/0x180 [drm] [ 162.449508] nouveau_drm_ioctl+0x68/0xc0 [nouveau] [ 162.449513] do_vfs_ioctl+0xb0/0x690 [ 162.449517] ksys_ioctl+0x70/0x80 [ 162.449520] __x64_sys_ioctl+0x16/0x20 [ 162.449522] do_syscall_64+0x55/0x120 [ 162.449525] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 162.449527] RIP: 0033:0x7f57ba419017 [ 162.449529] Code: 00 00 00 48 8b 05 81 7e 2b 00 64 c7 00 26 00 00 00 48 c7 c0 ff ff ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 b8 10 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 51 7e 2b 00 f7 d8 64 89 01 48 [ 162.449530] RSP: 002b:00007fff12e4fcf8 EFLAGS: 00003246 ORIG_RAX: 0000000000000010 [ 162.449532] RAX: ffffffffffffffda RBX: 0000000000000014 RCX: 00007f57ba419017 [ 162.449533] RDX: 00007fff12e4fd30 RSI: 00000000c06864a2 RDI: 0000000000000014 [ 162.449534] RBP: 00007fff12e4fd30 R08: 0000000000000000 R09: 000055f5b115cce0 [ 162.449535] R10: 00007fff12e4fed0 R11: 0000000000003246 R12: 00000000c06864a2 [ 162.449536] R13: 0000000000000014 R14: 000055f5b0863000 R15: 000055f5b078d230 [ 162.449538] ---[ end trace 11d212b7f8d04b60 ]--- [ 162.449562] [drm:drm_dp_atomic_release_vcpi_slots [drm_kms_helper]] *ERROR* no VCPI for [MST PORT:0000000020cedb5a] found in mst state 00000000bab63e56 I can trigger that bug easily with the following steps : 1. boot into xorg/desktop 2. expand the screen to the external monitor (e.g.with "xrandr --output DP-1-1-1 --auto --right-of eDP1") 3. undock the laptop 4. redock the laptop results in the kernel warning showed above After getting that warning there is no way to get the external monitor working again until a whole reboot cycle. I have checked some older versions of the kernel and that bug was introduced in 5.1-rc1. The hardware is a Lenovo P50 laptop with a workstation dock and a Dell U2412M connected on the display port of the docking station. The external screen is connected to a Quadro M1000M graphic card driven with the nouveau driver. A possible work around for the moment is to disable the external monitor with "xrandr --output DP-1-1-1 --off" before undocking. If you need further informations let me know. Best Regards Manfred Benesch _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/dri-devel
