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<base href="https://bugs.freedesktop.org/">
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<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Trying to set mode 3840x2160 at 60 Hz results in a crash"
href="https://bugs.freedesktop.org/show_bug.cgi?id=95392">95392</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>Trying to set mode 3840x2160 at 60 Hz results in a crash
</td>
</tr>
<tr>
<th>Product</th>
<td>DRI
</td>
</tr>
<tr>
<th>Version</th>
<td>DRI git
</td>
</tr>
<tr>
<th>Hardware</th>
<td>x86-64 (AMD64)
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux (All)
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>medium
</td>
</tr>
<tr>
<th>Component</th>
<td>DRM/Intel
</td>
</tr>
<tr>
<th>Assignee</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>b52@reaktor42.de
</td>
</tr>
<tr>
<th>QA Contact</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>CC</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=123732" name="attach_123732" title="dmesg.log">attachment 123732</a> <a href="attachment.cgi?id=123732&action=edit" title="dmesg.log">[details]</a></span>
dmesg.log
If I try to go from 30 to 60 Hz refresh rate at a 4k resolution of 3840x2160
results in a 'no input' at my external display with a corresponding OOPs in my
dmesg log:
[ 83.446091] ------------[ cut here ]------------
[ 83.446194] WARNING: CPU: 2 PID: 452 at
drivers/gpu/drm/i915/intel_display.c:13917 skl_max_scale.part.90+0x6d/0x80
[i915]
[ 83.446203] WARN_ON_ONCE(!crtc_clock || cdclk < crtc_clock)
[ 83.446209] Modules linked in:
[ 83.446216] snd_hda_codec_hdmi dell_led snd_hda_codec_realtek
snd_hda_codec_generic arc4 snd_soc_skl snd_soc_skl_ipc snd_soc_sst_ipc
snd_soc_sst_dsp snd_hda_ext_core snd_soc_sst_match snd_soc_core snd_compress
snd_pcm_dmaengine ac97_bus snd_hda_intel dell_laptop snd_hda_codec dell_wmi
i2c_designware_platform dell_smbios nls_iso8859_1 i2c_designware_core nls_cp437
dcdbas iwlmvm vfat intel_rapl fat rtsx_pci_ms i915 mac80211
x86_pkg_temp_thermal intel_powerclamp coretemp snd_hda_core uvcvideo snd_hwdep
iwlwifi snd_pcm videobuf2_vmalloc snd_timer videobuf2_memops kvm_intel
videobuf2_v4l2 drm_kms_helper videobuf2_core kvm cfg80211 pcspkr psmouse snd
irqbypass memstick idma64 serio_raw mei_me videodev virt_dma i2c_i801 soundcore
mei shpchp media drm intel_pch_thermal intel_lpss_pci mousedev intel_gtt
[ 83.446380] evdev joydev input_leds btusb syscopyarea led_class btrtl
sysfillrect processor_thermal_device sysimgblt mac_hid fb_sys_fops
intel_soc_dts_iosf i2c_algo_bit fan thermal wmi battery i2c_hid hci_uart btbcm
btqca video btintel pinctrl_sunrisepoint pinctrl_intel bluetooth rfkill crc16
intel_lpss_acpi intel_lpss int3400_thermal acpi_thermal_rel intel_hid
int3403_thermal sparse_keymap int340x_thermal_zone ac button acpi_pad acpi_als
fjes kfifo_buf industrialio tpm_tis tpm sch_fq_codel ip_tables x_tables
algif_skcipher af_alg hid_multitouch hid_generic usbhid hid dm_crypt dm_mod
rtsx_pci_sdmmc mmc_core atkbd libps2 crct10dif_pclmul crc32_pclmul
ghash_clmulni_intel aesni_intel aes_x86_64 lrw gf128mul glue_helper ablk_helper
cryptd ahci libahci nvme nvme_core libata xhci_pci rtsx_pci xhci_hcd
[ 83.446560] scsi_mod usbcore usb_common i8042 serio xfs crc32c_generic
crc32c_intel libcrc32c
[ 83.446589] CPU: 2 PID: 452 Comm: Xorg Tainted: G U
4.6.0-rc7-g44549e8 #1
[ 83.446597] Hardware name: Dell Inc. XPS 13 9350/09JHRY, BIOS 1.3.3
03/01/2016
[ 83.446604] 0000000000000286 000000002af38527 ffff88046a2cba20
ffffffff812e34a1
[ 83.446618] ffff88046a2cba70 0000000000000000 ffff88046a2cba60
ffffffff8107a5bb
[ 83.446630] 0000365d000008ae ffff88046bf773c0 ffff88046b16ac00
ffff88046a187000
[ 83.446643] Call Trace:
[ 83.446667] [<ffffffff812e34a1>] dump_stack+0x63/0x82
[ 83.446677] [<ffffffff8107a5bb>] __warn+0xcb/0xf0
[ 83.446689] [<ffffffff8107a63f>] warn_slowpath_fmt+0x5f/0x80
[ 83.446752] [<ffffffffa0a22cc0>] ? intel_dp_compute_config+0x2c0/0x6a0
[i915]
[ 83.446818] [<ffffffffa09ee3ed>] skl_max_scale.part.90+0x6d/0x80 [i915]
[ 83.446873] [<ffffffffa09ee4c0>] intel_check_primary_plane+0xc0/0xe0 [i915]
[ 83.446936] [<ffffffffa09de9ee>] intel_plane_atomic_check+0x12e/0x1f0
[i915]
[ 83.446957] [<ffffffffa083b488>] drm_atomic_helper_check_planes+0x48/0x1d0
[drm_kms_helper]
[ 83.447026] [<ffffffffa09f9753>] intel_atomic_check+0x2a3/0x1140 [i915]
[ 83.447055] [<ffffffffa05384d8>] drm_atomic_check_only+0x188/0x610 [drm]
[ 83.447080] [<ffffffffa0537f8c>] ?
drm_atomic_set_crtc_for_connector+0x6c/0x110 [drm]
[ 83.447105] [<ffffffffa0538977>] drm_atomic_commit+0x17/0x60 [drm]
[ 83.447123] [<ffffffffa083bf81>] drm_atomic_helper_set_config+0x81/0xc0
[drm_kms_helper]
[ 83.447160] [<ffffffffa0526e55>] drm_mode_set_config_internal+0x65/0x110
[drm]
[ 83.447195] [<ffffffffa052bff8>] drm_mode_setcrtc+0x448/0x560 [drm]
[ 83.447222] [<ffffffffa051da12>] drm_ioctl+0x152/0x540 [drm]
[ 83.447252] [<ffffffffa052bbb0>] ? drm_mode_setplane+0x1c0/0x1c0 [drm]
[ 83.447269] [<ffffffff811f4c0c>] ? __vfs_write+0xcc/0x100
[ 83.447282] [<ffffffff81207fa1>] do_vfs_ioctl+0xa1/0x5b0
[ 83.447292] [<ffffffff81087631>] ? __set_task_blocked+0x41/0xa0
[ 83.447301] [<ffffffff812123f7>] ? __fget+0x77/0xb0
[ 83.447313] [<ffffffff81208529>] SyS_ioctl+0x79/0x90
[ 83.447323] [<ffffffff8108a17e>] ? SyS_rt_sigprocmask+0x8e/0xc0
[ 83.447334] [<ffffffff815c6e32>] entry_SYSCALL_64_fastpath+0x1a/0xa4
[ 83.447377] ---[ end trace 25edcc9116054f9e ]---
[ 83.505895] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU
pipe B FIFO underrun
My setup is as follows:
- Dell XPS 13 9350
- Intel Iris 540
- Display LG 27UD68P-W
- DP 1.2 cable
See the attached `dmesg` and `lspci -vvnn` output for more information:
- dmesg: <a href="http://ix.io/DEH">http://ix.io/DEH</a>
- lspci: <a href="http://ix.io/DEG">http://ix.io/DEG</a>
My ultimate goal is to drive my external display at 4k with 60 Hz. I figured
this should be possible given the listed hardware.</pre>
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