我在华硕笔记本电脑上运行 kubuntu 15.10。它一直运行良好（除了启动时间很长，没有明确的解释），从昨天开始，我无法再启动 kde 会话。我输入了登录名和密码，几秒钟后，我又回到了登录屏幕。
以下是系统日志中的一条跟踪信息：
Mar 9 22:05:32 pcl-asus kernel: [ 401.714189] ------------[ cut here ]------------
Mar 9 22:05:32 pcl-asus kernel: [ 401.714200] WARNING: CPU: 0 PID: 50 at /build/linux-AFqQDb/linux-4.2.0/drivers/gpu/drm/i915/intel_display.c:12328 check_crtc_state+0x2c5/0x440 [i915]()
Mar 9 22:05:32 pcl-asus kernel: [ 401.714200] pipe state doesn't match!
Mar 9 22:05:32 pcl-asus kernel: [ 401.714222] Modules linked in: cdc_ether usbnet mii xt_CHECKSUM iptable_mangle ipt_MASQUERADE nf_nat_masquerade_ipv4 iptable_nat nf_nat_ipv4 nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack nf_conntrack ipt_REJECT nf_reject_ipv4 xt_tcpudp bridge stp llc ebtable_filter ebtables ip6table_filter ip6_tables iptable_filter ip_tables x_tables bbswitch(OE) binfmt_misc nls_iso8859_1 arc4 asus_nb_wmi asus_wmi sparse_keymap mxm_wmi nvidia(POE) intel_rapl x86_pkg_temp_thermal intel_powerclamp coretemp iwlmvm crct10dif_pclmul crc32_pclmul aesni_intel mac80211 aes_x86_64 lrw gf128mul glue_helper ablk_helper cryptd snd_hda_codec_hdmi input_leds joydev uvcvideo videobuf2_vmalloc serio_raw videobuf2_memops videobuf2_core v4l2_common videodev iwlwifi media snd_hda_codec_conexant snd_hda_codec_generic snd_soc_rt5640 snd_soc_rl6231 lpc_ich snd_hda_intel cfg80211 snd_soc_core snd_hda_codec snd_compress snd_hda_core ac97_bus snd_hwdep snd_pcm_dmaengine snd_seq_midi hid_multitouch snd_seq_midi_event snd_pcm snd_rawmidi shpchp mei_me snd_seq mei kvm_intel kvm wmi dw_dmac dw_dmac_core snd_seq_device snd_timer int3402_thermal snd_soc_sst_acpi snd int3400_thermal 8250_dw acpi_thermal_rel acpi_als soundcore kfifo_buf processor_thermal_device i2c_designware_platform int340x_thermal_zone industrialio i2c_designware_core mac_hid intel_soc_dts_iosf spi_pxa2xx_platform intel_smartconnect iosf_mbi parport_pc ppdev lp parport autofs4 hid_generic usbhid psmouse i915 i2c_algo_bit drm_kms_helper ahci drm libahci video sdhci_acpi sdhci i2c_hid hid
Mar 9 22:05:32 pcl-asus kernel: [ 401.714242] CPU: 0 PID: 50 Comm: kworker/0:1 Tainted: P W OE 4.2.0-23-generic #28-Ubuntu
Mar 9 22:05:32 pcl-asus kernel: [ 401.714243] Hardware name: ASUSTeK COMPUTER INC. UX303LN/UX303LN, BIOS UX303LN.204 09/01/2014
Mar 9 22:05:32 pcl-asus kernel: [ 401.714247] Workqueue: events console_callback
Mar 9 22:05:32 pcl-asus kernel: [ 401.714248] 0000000000000000 000000008fefa895 ffff880224ea3658 ffffffff817e94c9
Mar 9 22:05:32 pcl-asus kernel: [ 401.714249] 0000000000000000 ffff880224ea36b0 ffff880224ea3698 ffffffff8107b3d6
Mar 9 22:05:32 pcl-asus kernel: [ 401.714250] ffff880224ea36d8 ffff880224ea3740 ffff880225783800 0000000000000001
Mar 9 22:05:32 pcl-asus kernel: [ 401.714250] Call Trace:
Mar 9 22:05:32 pcl-asus kernel: [ 401.714254] [<ffffffff817e94c9>] dump_stack+0x45/0x57
Mar 9 22:05:32 pcl-asus kernel: [ 401.714258] [<ffffffff8107b3d6>] warn_slowpath_common+0x86/0xc0
Mar 9 22:05:32 pcl-asus kernel: [ 401.714259] [<ffffffff8107b465>] warn_slowpath_fmt+0x55/0x70
Mar 9 22:05:32 pcl-asus kernel: [ 401.714268] [<ffffffffc0199941>] ? intel_pipe_config_compare+0xb31/0xc60 [i915]
Mar 9 22:05:32 pcl-asus kernel: [ 401.714276] [<ffffffffc0199d35>] check_crtc_state+0x2c5/0x440 [i915]
Mar 9 22:05:32 pcl-asus kernel: [ 401.714287] [<ffffffffc01adb5d>] intel_modeset_check_state+0x21d/0x6d0 [i915]
Mar 9 22:05:32 pcl-asus kernel: [ 401.714296] [<ffffffffc01aed17>] intel_crtc_set_config+0x4c7/0x580 [i915]
Mar 9 22:05:32 pcl-asus kernel: [ 401.714306] [<ffffffffc00ae4a6>] drm_mode_set_config_internal+0x66/0x100 [drm]
Mar 9 22:05:32 pcl-asus kernel: [ 401.714311] [<ffffffffc01252a5>] drm_fb_helper_pan_display+0x95/0xe0 [drm_kms_helper]
Mar 9 22:05:32 pcl-asus kernel: [ 401.714313] [<ffffffff81442ead>] ? soft_cursor+0x1ad/0x230
Mar 9 22:05:32 pcl-asus kernel: [ 401.714322] [<ffffffffc01bc0ea>] intel_fbdev_pan_display+0x1a/0x60 [i915]
Mar 9 22:05:32 pcl-asus kernel: [ 401.714324] [<ffffffff81447e0f>] fb_pan_display+0xcf/0x160
Mar 9 22:05:32 pcl-asus kernel: [ 401.714326] [<ffffffff81441f40>] bit_update_start+0x20/0x50
Mar 9 22:05:32 pcl-asus kernel: [ 401.714327] [<ffffffff8143f003>] fbcon_switch+0x3b3/0x650
Mar 9 22:05:32 pcl-asus kernel: [ 401.714328] [<ffffffff814d28dc>] redraw_screen+0x1ac/0x2a0
Mar 9 22:05:32 pcl-asus kernel: [ 401.714330] [<ffffffff814c8cd3>] complete_change_console+0x43/0xe0
Mar 9 22:05:32 pcl-asus kernel: [ 401.714331] [<ffffffff814ca4c9>] change_console+0x59/0xa0
Mar 9 22:05:32 pcl-asus kernel: [ 401.714332] [<ffffffff814d4ef0>] console_callback+0x110/0x180
Mar 9 22:05:32 pcl-asus kernel: [ 401.714335] [<ffffffff810941ca>] process_one_work+0x1aa/0x440
Mar 9 22:05:32 pcl-asus kernel: [ 401.714336] [<ffffffff810944ab>] worker_thread+0x4b/0x4c0
Mar 9 22:05:32 pcl-asus kernel: [ 401.714337] [<ffffffff81094460>] ? process_one_work+0x440/0x440
Mar 9 22:05:32 pcl-asus kernel: [ 401.714339] [<ffffffff81094460>] ? process_one_work+0x440/0x440
Mar 9 22:05:32 pcl-asus kernel: [ 401.714341] [<ffffffff8109a868>] kthread+0xd8/0xf0
Mar 9 22:05:32 pcl-asus kernel: [ 401.714342] [<ffffffff8109a790>] ? kthread_create_on_node+0x1f0/0x1f0
Mar 9 22:05:32 pcl-asus kernel: [ 401.714343] [<ffffffff817f06df>] ret_from_fork+0x3f/0x70
Mar 9 22:05:32 pcl-asus kernel: [ 401.714344] [<ffffffff8109a790>] ? kthread_create_on_node+0x1f0/0x1f0
Mar 9 22:05:32 pcl-asus kernel: [ 401.714345] ---[ end trace 2dd4952a90a8cb1e ]---
我还可以看到另一条日志消息，但我不知道它是否相关：
Mar 9 22:05:41 pcl-asus systemd[1]: dev-disk-by\x2duuid-6b3f9aba\x2d7e64\x2d4009\x2db7f2\x2d00efb8bbe8e9.device: Job dev-disk-by\x2duuid-6b3f9aba\x2d7e64\x2d4009\x2db7f2\x2d00efb8bbe8e9.device/start timed out.
Mar 9 22:05:41 pcl-asus systemd[1]: Timed out waiting for device dev-disk-by\x2duuid-6b3f9aba\x2d7e64\x2d4009\x2db7f2\x2d00efb8bbe8e9.device.
Mar 9 22:05:41 pcl-asus systemd[1]: Dependency failed for /dev/disk/by-uuid/6b3f9aba-7e64-4009-b7f2-00efb8bbe8e9.
Mar 9 22:05:41 pcl-asus systemd[1]: dev-disk-by\x2duuid-6b3f9aba\x2d7e64\x2d4009\x2db7f2\x2d00efb8bbe8e9.swap: Job dev-disk-by\x2duuid-6b3f9aba\x2d7e64\x2d4009\x2db7f2\x2d00efb8bbe8e9.swap/start failed with result 'dependency'.
Mar 9 22:05:41 pcl-asus systemd[1]: dev-disk-by\x2duuid-6b3f9aba\x2d7e64\x2d4009\x2db7f2\x2d00efb8bbe8e9.device: Job dev-disk-by\x2duuid-6b3f9aba\x2d7e64\x2d4009\x2db7f2\x2d00efb8bbe8e9.device/start failed with result 'timeout'.
有人能帮我解决我的问题吗？
答案1
感谢您的评论：根本原因确实相同。.Xauthority 文件归 root 所有，我必须更改所有者才能解决我的问题。
更详细地说，我执行了：chown user:group ~/.Xauthority 其中 user 是我的用户名，group 是我的默认组