<html> <head> <base href="https://bugs.freedesktop.org/" /> </head> <body> <div> <a class="bz_bug_link bz_status_NEW " title="NEW - WARN_ON(!(old->frontbuffer_bits & frontbuffer_bits))" href="https://bugs.freedesktop.org/show_bug.cgi?id=91866#c2">Comment # 2</a> on <a class="bz_bug_link bz_status_NEW " title="NEW - WARN_ON(!(old->frontbuffer_bits & frontbuffer_bits))" href="https://bugs.freedesktop.org/show_bug.cgi?id=91866">bug 91866</a> from <a class="email" href="mailto:buti@bux.at" title="till busch <buti@bux.at>"> till busch</a> <pre>Same problem on Lenovo Y50-70. First warning when gdm (wayland) starts. Second warning when X sessions starts after login. A new warning (with trace) appears at every switch from console to X -- but not from X to console. The system works well regardless of the warning. No warnings with Linux 4.1.6. uname -a Linux osiris 4.2.1-1-ARCH #1 SMP PREEMPT Tue Sep 22 06:57:07 CEST 2015 x86_64 GNU/Linux dmesg [ 14.051664] ------------[ cut here ]------------ [ 14.051681] WARNING: CPU: 4 PID: 797 at drivers/gpu/drm/i915/i915_gem.c:5269 i915_gem_track_fb+0x129/0x140 [i915]() [ 14.051684] WARN_ON(!(old->frontbuffer_bits & frontbuffer_bits)) [ 14.051686] Modules linked in: [ 14.051687] cmac ecb rfcomm fuse bnep nf_conntrack_netbios_ns nf_conntrack_broadcast xt_tcpudp ip6t_rpfilter ip6t_REJECT nf_reject_ipv6 ipt_REJECT nf_reject_ipv4 xt_conntrack ebtable_broute bridge stp llc ebtable_filter ebtable_nat ebtables ip6table_security ip6table_mangle ip6table_raw ip6table_nat nf_conntrack_ipv6 nf_defrag_ipv6 nf_nat_ipv6 ip6table_filter ip6_tables iptable_security iptable_mangle iptable_raw iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack iptable_filter bbswitch(O) nls_iso8859_1 nls_cp437 joydev mousedev arc4 snd_hda_codec_realtek snd_hda_codec_generic snd_hda_codec_hdmi hid_generic uvcvideo intel_rapl ath3k iosf_mbi videobuf2_vmalloc btusb x86_pkg_temp_thermal intel_powerclamp videobuf2_memops videobuf2_core btrtl ath9k btbcm coretemp btintel bluetooth [ 14.051731] v4l2_common videodev usbhid ath9k_common ath9k_hw kvm_intel hid media crc16 iTCO_wdt ath kvm iTCO_vendor_support snd_hda_intel mac80211 snd_hda_codec crct10dif_pclmul crc32_pclmul i915 ghash_clmulni_intel cfg80211 aesni_intel snd_hda_core aes_x86_64 lrw gf128mul glue_helper ablk_helper cryptd snd_hwdep evdev r8169 drm_kms_helper snd_pcm input_leds rtsx_pci_ms led_class drm psmouse memstick mac_hid snd_timer i2c_i801 serio_raw snd mii pcspkr ie31200_edac mei_me intel_gtt soundcore i2c_algo_bit mei shpchp lpc_ich edac_core thermal ideapad_laptop wmi sparse_keymap rfkill battery video processor button ac sch_fq_codel nfs lockd grace sunrpc fscache ip_tables x_tables sd_mod ahci rtsx_pci_sdmmc libahci mmc_core xhci_pci ehci_pci xhci_hcd ehci_hcd atkbd libata libps2 usbcore rtsx_pci scsi_mod [ 14.051789] usb_common i8042 serio vfat fat crc32c_generic crc32c_intel btrfs xor raid6_pq [ 14.051799] CPU: 4 PID: 797 Comm: gnome-shell Tainted: G U O 4.2.1-1-ARCH #1 [ 14.051802] Hardware name: LENOVO 20378/Lenovo Y50-70, BIOS 9ECN40WW(V3.00) 07/22/2015 [ 14.051804] 0000000000000000 000000000ac54ab5 ffff880439ad7a28 ffffffff8156b77a [ 14.051807] 0000000000000000 ffff880439ad7a80 ffff880439ad7a68 ffffffff81074846 [ 14.051810] ffff8804450a0000 0000000000000010 ffff88042cb898c0 ffff8804452fc000 [ 14.051813] Call Trace: [ 14.051819] [<ffffffff8156b77a>] dump_stack+0x4c/0x6e [ 14.051825] [<ffffffff81074846>] warn_slowpath_common+0x86/0xc0 [ 14.051828] [<ffffffff810748d5>] warn_slowpath_fmt+0x55/0x70 [ 14.051837] [<ffffffffa07c8c19>] i915_gem_track_fb+0x129/0x140 [i915] [ 14.051849] [<ffffffffa0810477>] intel_prepare_plane_fb+0xe7/0x1a0 [i915] [ 14.051856] [<ffffffffa0507e39>] drm_atomic_helper_prepare_planes+0x59/0xe0 [drm_kms_helper] [ 14.051867] [<ffffffffa080888e>] __intel_set_mode+0x1ae/0xb60 [i915] [ 14.051883] [<ffffffffa080a50f>] ? intel_modeset_compute_config+0x3af/0xb60 [i915] [ 14.051895] [<ffffffffa080fe26>] intel_crtc_set_config+0x2b6/0x580 [i915] [ 14.051903] [<ffffffffa04799f6>] drm_mode_set_config_internal+0x66/0x100 [drm] [ 14.051911] [<ffffffffa047e809>] drm_mode_setcrtc+0x3e9/0x500 [drm] [ 14.051917] [<ffffffffa046f575>] drm_ioctl+0x125/0x610 [drm] [ 14.051923] [<ffffffffa047e420>] ? drm_mode_setplane+0x1b0/0x1b0 [drm] [ 14.051928] [<ffffffff811e29b5>] do_vfs_ioctl+0x295/0x480 [ 14.051932] [<ffffffff811ecaa7>] ? __fget+0x77/0xb0 [ 14.051934] [<ffffffff811e2c19>] SyS_ioctl+0x79/0x90 [ 14.051938] [<ffffffff81570cee>] entry_SYSCALL_64_fastpath+0x12/0x71 [ 14.051941] ---[ end trace 8681a9e39d986791 ]---</pre> </div> <hr> You are receiving this mail because: <ul> <li>You are the QA Contact for the bug.</li> <li>You are on the CC list for the bug.</li> <li>You are the assignee for the bug.</li> </ul> </body> </html>