Bug#762993: xserver-xorg-video-intel: LVDS display blanks when DP is plugged in
On Fri, Sep 26, 2014 at 04:51:13PM -0400, Andrew Perrin wrote:
> [ 3.164796] [drm] Initialized i915 1.6.0 20080730 for 0000:00:02.0 on minor 0
> [ 7.101437] [drm:intel_dp_aux_native_write] *ERROR* too many retries, giving up
> [ 7.101449] [drm:intel_dp_start_link_train] *ERROR* failed to enable link training
> [ 7.108350] [drm:intel_dp_aux_native_write] *ERROR* too many retries, giving up
> [ 7.108367] [drm:intel_dp_complete_link_train] *ERROR* failed to start channel equalization
> [ 7.140438] [drm:cpt_verify_modeset] *ERROR* mode set failed: pipe A stuck
> [ 7.204652] WARNING: CPU: 0 PID: 1129 at /build/linux-2CRRWB/linux-3.14.15/drivers/gpu/drm/i915/intel_display.c:9468 intel_modeset_check_state+0x62c/0x770 [i915]()
> [ 7.204659] Modules linked in: bnep btusb bluetooth uvcvideo videobuf2_vmalloc 6lowpan_iphc videobuf2_memops videobuf2_core videodev media openafs(PO) binfmt_misc nfsd auth_rpcgss oid_registry nfs_acl nfs lockd fscache sunrpc x86_pkg_temp_thermal intel_powerclamp arc4 intel_rapl joydev coretemp snd_hda_codec_hdmi hid_multitouch iwldvm kvm mac80211 crc32_pclmul snd_hda_codec_realtek crc32c_intel snd_hda_codec_generic ghash_clmulni_intel iTCO_wdt iTCO_vendor_support aesni_intel aes_x86_64 lrw gf128mul glue_helper ablk_helper cryptd iwlwifi evdev psmouse pcspkr serio_raw i2c_i801 i915 cfg80211 snd_hda_intel snd_hda_codec thinkpad_acpi snd_hwdep ac nvram snd_pcm mei_me wmi rfkill drm_kms_helper mei snd_timer battery drm snd soundcore tpm_tis tpm i2c_algo_bit i2c_core lpc_ich video mfd_core button shpchp processor fuse parport_pc ppdev lp parport autofs4 usbhid hid ext4 crc16 mbcache jbd2 sg sd_mod crc_t10dif crct10dif_generic crct10dif_pclmul crct10dif_common ehci_pci ahci ehci_hcd xhci_hcd libahci libata sdhci_pci sdhci scsi_mod mmc_core usbcore thermal usb_common thermal_sys
> [ 7.204919] [<ffffffffa02ccbd5>] ? drm_mode_set_config_internal+0x55/0xd0 [drm]
> [ 7.204936] [<ffffffffa02cf7ab>] ? drm_mode_setcrtc+0xeb/0x5a0 [drm]
> [ 7.204952] [<ffffffffa02c189d>] ? drm_ioctl+0x42d/0x530 [drm]
> [ 7.205009] [drm:intel_pipe_config_compare] *ERROR* mismatch in has_dp_encoder (expected 1, found 0)
This seems to be a kernel bug, see
https://bugs.freedesktop.org/show_bug.cgi?id=81537
There's also a workaround suggested there.
Berto
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